MCP server that wraps the Dagster GraphQL API — manage runs, assets, schedules, sensors, and backfills from any MCP client
Nothing to run from here
calc.engineer is installed from its publisher's own source and answers where it runs, so this marketplace is not in the path of a single call. There is no address here to send one to, and a panel that pretended otherwise would be showing you an answer we made up. Install it and call it from your own client — the Installation tab has the entry for each one.
89
tools declared
—
trust score
remote
at its publisher
—
calls last 7d
What it does
88 free engineering calculators: RF link budgets, LoRa/Meshtastic, PCB, solar, homelab. Keyless.
Quickstart
# 1 — add it to Claude Code
claude mcp add --scope user --transport http calc-engineer-mcp https://calc.engineer/mcp
# 2 — ask your agent for something these tools do
# fspl, link_budget, dipole and 86 more
calc.engineer costs nothing on mcprush: there is no plan to choose here, no cap to set and nothing mcprush can bill you for.
Publishernot claimed
CAAll 1 server
calc1 server
1 category
Collected from a public index. Nobody has claimed this account, so nothing here was written by its author — claim it if it is yours.
Installation
Where are you running it?
Every route below installs the same thing and ends at the same approval screen. Nothing here runs on your machine and nothing runs on ours: this server answers at its publisher’s own address, and what you install is the connection straight to it.
Claude Codedeclared by this listing
This is a public server: it answers at its publisher’s own address and this marketplace is not in the path. Claude Code registers it in one command; --scope user makes it available in every project. The transport below is http, as the publisher's own manifest declares it.
claude mcp add --scope user --transport http calc-engineer-mcp https://calc.engineer/mcpReconnect, or start a new session, and the tools appear in the model’s tool list.
Free on mcprush, and it answers at its publisher’s own address: this marketplace is not in the path, so there is no key of ours to hold and no card to add.
What it writes
One config entry pointing straight at the publisher’s own address — this marketplace is not in the path, and nothing from this listing executes on your machine.
What you approve
89 tools, with what each one reads, writes and reaches shown before you agree — the same list on every route above. Read the tool surface.
Tool surface
What the model actually sees. Descriptions are diffed on every release — see version history.
Calculate free-space path loss (FSPL) in decibels using the ITU-R P.525 standard formula. Given a frequency in MHz and distance in kilometres, returns the expected signal attenuation in an ideal line-of-sight radio link with no obstacles, reflections, or atmospheric absorption. Also computes the RF wavelength. Use this to estimate baseline path loss before adding fade margins, antenna gains, or en
| Parameter | Type | Required | Notes |
|---|---|---|---|
| freq_mhz | number | yes | Carrier frequency in megahertz (MHz) |
| dist_km | number | yes | Distance between transmitter and receiver in kilometres |
Compute a full RF link budget from transmitter power, frequency, distance, and antenna gains. Calculates EIRP, free-space path loss (ITU-R P.525), received power at the receiver, and link margin relative to an optional receiver sensitivity threshold. Use this to determine whether a wireless link closes with adequate margin. Accepts output from noise_figure_cascade and feeds into snr_margin for ful
| Parameter | Type | Required | Notes |
|---|---|---|---|
| tx_dbm | number | yes | Transmitter output power in dBm |
| freq_mhz | number | yes | Carrier frequency in megahertz (MHz) |
| dist_km | number | yes | Link distance in kilometres |
| tx_gain_dbi | number | no | Transmit antenna gain in dBi (default 2.15 for a half-wave dipole) |
| rx_gain_dbi | number | no | Receive antenna gain in dBi (default 2.15 for a half-wave dipole) |
| rx_sensitivity_dbm | number | no | Receiver sensitivity in dBm; when provided, link margin is calculated |
Calculate physical dimensions of a dipole antenna for a given frequency. Returns half-wave or quarter-wave element length in metres, feet, and inches. A half-wave dipole is the most common resonant antenna with approximately 2.15 dBi gain. A quarter-wave monopole (ground plane antenna) is half the length and is widely used in handheld radios and vehicle-mounted systems. Use this before building or
| Parameter | Type | Required | Notes |
|---|---|---|---|
| freq_mhz | number | yes | Operating frequency in megahertz (MHz) |
| type | string | no | Antenna type: half_wave dipole or quarter_wave monopole |
Calculate PCB microstrip trace width for a target characteristic impedance using the Hammerstad-Jensen closed-form equations. Given target impedance (Z0), substrate dielectric constant (er), substrate height, and copper weight, returns the required trace width and effective dielectric constant. Optionally computes effective wavelength at a given frequency. Essential for RF PCB layout to achieve co
| Parameter | Type | Required | Notes |
|---|---|---|---|
| z0_ohm | number | no | Target characteristic impedance in ohms (default 50) |
| er | number | no | Substrate relative dielectric constant (default 4.6 for FR-4) |
| height_mm | number | yes | Substrate height (dielectric thickness) in millimetres |
| copper_oz | number | no | Copper weight in oz/ft2 (1 oz = 0.035 mm thickness) |
| freq_mhz | number | no | Optional frequency in MHz for effective wavelength calculation |
Convert a power level in dBm to milliwatts, watts, dBW, and RMS voltage across a given impedance. dBm is the standard unit for RF power referenced to 1 milliwatt. This tool is essential when interfacing datasheets (which use dBm) with circuit analysis (which uses volts and watts). Default impedance is 50 ohms, matching most RF systems. Use this to quickly verify power amplifier output, receiver se
| Parameter | Type | Required | Notes |
|---|---|---|---|
| dbm | number | yes | Power level in dBm (decibels relative to 1 milliwatt) |
| impedance_ohm | number | no | Load impedance in ohms for Vrms calculation (default 50) |
Calculate the cascaded noise figure of a multi-stage receiver chain using the Friis formula. Each stage has a noise figure and gain in dB. The first stage dominates overall system noise, which is why low-noise amplifiers (LNAs) are placed at the front of the chain. Returns total cascaded noise figure, total gain, and equivalent noise temperature. Feeds into link_budget for complete receive-chain s
| Parameter | Type | Required | Notes |
|---|---|---|---|
| stages | array | yes | Ordered array of receiver chain stages, each with nf_db and gain_db |
Convert between VSWR, return loss, and reflection coefficient — provide any one parameter and get all related impedance-mismatch metrics. Computes VSWR (voltage standing wave ratio), return loss in dB, reflection coefficient (gamma), mismatch loss, and percentage of power reflected vs transmitted. Essential for antenna matching, transmission line analysis, and RF system budgeting. Feeds into link_
| Parameter | Type | Required | Notes |
|---|---|---|---|
| vswr | number | no | Voltage standing wave ratio (>= 1.0, where 1.0 is perfect match) |
| return_loss_db | number | no | Return loss in decibels (positive value, higher is better match) |
| reflection_coefficient | number | no | Reflection coefficient magnitude (gamma), 0 to 1 |
Design a Pi-topology resistive attenuator pad. Given a desired attenuation in dB and characteristic impedance (default 50 ohm), computes the three resistor values for a symmetrical Pi-pad network. The Pi attenuator uses two shunt resistors (R1, R3) and one series resistor (R2). Commonly used in RF signal chains to reduce signal level while maintaining impedance match. Compare with attenuator_tee f
| Parameter | Type | Required | Notes |
|---|---|---|---|
| attenuation_db | number | yes | Desired attenuation in decibels (positive value) |
| z0_ohm | number | no | Characteristic impedance in ohms (default 50) |
Design a Tee-topology resistive attenuator pad. Given a desired attenuation in dB and characteristic impedance (default 50 ohm), computes the three resistor values for a symmetrical T-pad network. The Tee attenuator uses two series resistors (R1, R3) and one shunt resistor (R2). Commonly used in RF signal chains to reduce signal level while maintaining impedance match. Compare with attenuator_pi f
| Parameter | Type | Required | Notes |
|---|---|---|---|
| attenuation_db | number | yes | Desired attenuation in decibels (positive value) |
| z0_ohm | number | no | Characteristic impedance in ohms (default 50) |
Calculate the Fresnel zone radius at the midpoint of a radio link. Given frequency in MHz, link distance in kilometres, and zone number (1-5), returns the Fresnel zone radius in metres and feet, plus the 60% clearance threshold used in practical link engineering. The first Fresnel zone defines the region where most RF energy travels; obstructions within 60% of this radius cause significant signal
| Parameter | Type | Required | Notes |
|---|---|---|---|
| freq_mhz | number | yes | Operating frequency in megahertz (MHz) |
| dist_km | number | yes | Total link distance in kilometres |
| zone_number | integer | no | Fresnel zone number (1-5, default 1) |
Convert between radio frequency and wavelength. Provide either frequency in MHz or wavelength in metres, and get the full set of equivalent values: frequency in MHz and GHz, wavelength in metres, centimetres, millimetres, and feet. Essential for antenna dimensioning, waveguide selection, and quick band identification. The fundamental relationship is lambda = c / f where c is the speed of light (29
| Parameter | Type | Required | Notes |
|---|---|---|---|
| freq_mhz | number | no | Frequency in megahertz (MHz) |
| wavelength_m | number | no | Wavelength in metres |
Generate a complete SPICE netlist from a parameterized template. Supports common circuit topologies: low-pass RC filter, voltage divider, common emitter amplifier. Returns a ready-to-simulate netlist string that can be passed directly to spice_simulate. Use this when an agent needs to construct a circuit from high-level parameters without writing raw SPICE syntax. Feeds into spice_simulate for AC/
| Parameter | Type | Required | Notes |
|---|---|---|---|
| template | string | yes | Circuit template name |
| params | object | yes | Template-specific parameters (e.g. r_ohms, c_farads, v_source) |
| analysis | string | no | SPICE analysis type to include in netlist |
Run a SPICE circuit simulation directly in the worker. Accepts a standard SPICE netlist and performs operating-point (.op), DC sweep (.dc), AC frequency sweep (.ac), or transient (.tran) analysis using a built-in modified-nodal-analysis engine with Newton-Raphson nonlinear solving. Supports R, L, C, V, I sources (DC/AC/SIN/PULSE), diodes, BJTs (Ebers-Moll), MOSFETs (Shichman-Hodges level 1), contr
| Parameter | Type | Required | Notes |
|---|---|---|---|
| netlist | string | yes | SPICE netlist (ngspice-compatible). Must include at least one analysis command (.ac, .dc, .tran, .op) and end with .end |
| analysis | string | no | Override analysis type (auto-detected from netlist if omitted) |
| temperature_c | number | no | Simulation temperature in Celsius |
| options | object | no | Additional ngspice .options (e.g. { reltol: 0.001 }) |
| certify | boolean | no | If true, attach an a-posteriori existence certificate for the DC operating point (Newton–Kantorovich: proves a true solution exists within a computed radius, or refuses). Adds ~one extra back-solve. |
| tolerances | object | no | Component-tolerance box, e.g. {"R1":0.05,"V1":0.02} (fractional). With output_node, returns a certified min/max interval for that node over all component variations. R/V/I elements only. |
| output_node | string | no | Node whose voltage is certified over the tolerance box (required with tolerances). |
Calculates LoRa packet time-on-air using the Semtech AN1200.13 formula. Computes symbol duration, preamble time, payload symbol count, effective data rate, and the minimum transmission interval for 1% duty cycle compliance. Essential for capacity planning in LoRaWAN and Meshtastic mesh networks. Accepts spreading factor (SF7-SF12), bandwidth (125/250/500 kHz), coding rate (4/5-4/8), payload size,
| Parameter | Type | Required | Notes |
|---|---|---|---|
| sf | integer | no | LoRa spreading factor (7-12). Higher SF = longer range but slower data rate. |
| bw_khz | number | no | LoRa channel bandwidth in kHz. Common values: 125, 250, or 500. |
| cr | integer | no | LoRa coding rate denominator (5-8). Represents 4/5 through 4/8 FEC ratio. |
| payload_bytes | integer | yes | Application payload size in bytes (0-255). |
| preamble_symbols | integer | no | Number of preamble symbols. LoRaWAN uses 8; raw LoRa may vary. |
| explicit_header | boolean | no | Whether to use explicit header mode. True for LoRaWAN; false for implicit header. |
| crc | boolean | no | Whether CRC is appended to payload. Recommended true for reliability. |
| low_data_rate_optimize | boolean | no | Enable low data rate optimization. Auto-calculated if omitted: enabled for SF >= 11 at BW 125 kHz. |
Computes LoRa link SNR margin by comparing received power against the noise floor and the spreading-factor-dependent demodulation threshold from the Semtech SX1276 datasheet. Calculates receiver noise floor from thermal noise (-174 dBm/Hz), channel bandwidth, and receiver noise figure. Returns margin in dB and a boolean link-OK indicator. Use to validate whether a LoRa or Meshtastic link will reli
| Parameter | Type | Required | Notes |
|---|---|---|---|
| rx_power_dbm | number | yes | Received signal power in dBm (e.g., -110). Typically from a link budget calculation or field measurement. |
| sf | integer | no | LoRa spreading factor (7-12). Higher SF tolerates lower SNR. |
| bw_khz | number | no | LoRa channel bandwidth in kHz. Affects noise floor. |
| noise_figure_db | number | no | Receiver noise figure in dB. Typical LoRa radio NF is 6 dB (SX1276). |
Estimates Meshtastic or LoRa mesh channel utilization percentage based on node count, message rate, and per-packet airtime. Determines how much of the shared radio channel is occupied and computes the maximum number of nodes before exceeding a configurable duty cycle limit (default 10%). Returns utilization percentage, headroom, and total packet count. Chain from lora_airtime to get airtime_ms inp
| Parameter | Type | Required | Notes |
|---|---|---|---|
| nodes | integer | yes | Number of active nodes in the mesh network. |
| messages_per_hour_per_node | number | no | Average messages transmitted per hour per node. Includes position beacons and user messages. |
| airtime_ms | number | yes | Time-on-air per packet in milliseconds. Obtain from lora_airtime tool. |
| max_duty_cycle_pct | number | no | Maximum acceptable channel utilization percentage. Default 10% is a common Meshtastic guideline. |
Estimates LoRa maximum communication range by computing the free-space path loss (FSPL) link budget and applying terrain-dependent correction factors. Calculates total link budget from transmit power, antenna gains, and receiver sensitivity, then solves the FSPL equation for distance after subtracting terrain losses (0 dB open to 50 dB indoor). Returns estimated range in km, link margin at 1 km, a
| Parameter | Type | Required | Notes |
|---|---|---|---|
| tx_dbm | number | no | Transmit power in dBm. Typical LoRa: 14-30 dBm depending on region and module. |
| freq_mhz | number | no | Carrier frequency in MHz. Common: 868 (EU), 915 (US/AU), 433 (Asia). |
| tx_gain_dbi | number | no | Transmit antenna gain in dBi. 2.15 dBi = half-wave dipole. |
| rx_gain_dbi | number | no | Receive antenna gain in dBi. 2.15 dBi = half-wave dipole. |
| rx_sensitivity_dbm | number | no | Receiver sensitivity in dBm. Typical LoRa SF10/BW125: -130 dBm. Varies by SF and bandwidth. |
| terrain | string | no | Terrain type for path loss correction. open: line-of-sight, suburban: light buildings, urban: moderate buildings, dense_urban: city center, indoor: inside buildings. |
Calculates LoRa receiver sensitivity from spreading factor, bandwidth, and noise figure using the Semtech SX1276 datasheet SNR thresholds. Computes the noise floor from thermal noise density (-174 dBm/Hz), channel bandwidth, and receiver noise figure, then adds the spreading-factor-dependent minimum demodulation SNR. Returns sensitivity in dBm, noise floor, required SNR, and thermal noise referenc
| Parameter | Type | Required | Notes |
|---|---|---|---|
| sf | integer | no | LoRa spreading factor (7-12). Higher SF = better sensitivity but slower data rate. |
| bw_khz | number | no | LoRa channel bandwidth in kHz. Lower bandwidth = better sensitivity. |
| noise_figure_db | number | no | Receiver noise figure in dB. Typical LoRa radio NF is 6 dB (SX1276). |
Calculates LoRa duty cycle budget for EU868, US915, AS923, and AU915 regulatory regions. Computes maximum messages per hour, minimum transmission interval, and effective data rate under regional duty cycle constraints. EU868 and AS923 enforce 1% duty cycle (ETSI); US915 has no duty cycle limit but a 400 ms dwell time per channel (FCC); AU915 has no duty cycle limit. Flags dwell-time-limited region
| Parameter | Type | Required | Notes |
|---|---|---|---|
| airtime_ms | number | yes | Packet time-on-air in milliseconds. Obtain from the lora_airtime tool. |
| region | string | no | LoRa regulatory region. EU868: 1% duty cycle (ETSI). US915: no duty cycle but 400 ms dwell time (FCC). AS923: 1% duty cycle (varies by country). AU915: no duty cycle limit. |
Estimates Meshtastic node communication range using real hardware profiles and firmware channel presets. Combines device-specific TX power and antenna gain (Heltec V3, RAK WisBlock, T-Beam, T-Beam Supreme, Station G2) with firmware modem presets (Long Fast, Long Slow, Very Long Slow, Medium, Short) to compute receiver sensitivity and FSPL-based range with terrain correction. Automatically populate
| Parameter | Type | Required | Notes |
|---|---|---|---|
| device | string | no | Meshtastic hardware device. Selects default TX power, antenna gain, and noise figure. Use 'custom' to override all radio parameters manually. |
| channel_preset | string | no | Meshtastic firmware channel preset. Selects spreading factor, bandwidth, and coding rate. long_fast is the default; very_long_slow maximizes range at the cost of throughput. |
| terrain | string | no | Terrain type for path loss correction. open: line-of-sight, suburban: light buildings, urban: moderate buildings, dense_urban: city center, indoor: inside buildings. |
| antenna_gain_dbi | number | no | Override device default antenna gain in dBi. Useful for aftermarket antennas. |
| tx_power_dbm | number | no | Override device default transmit power in dBm. |
| sf | integer | no | Custom spreading factor (7-12). Only used when channel_preset is 'custom'. |
| bw_khz | number | no | Custom bandwidth in kHz. Only used when channel_preset is 'custom'. |
| cr | integer | no | Custom coding rate denominator (5-8). Only used when channel_preset is 'custom'. |
Checks EIRP (Effective Isotropic Radiated Power) compliance against regional regulatory limits for LoRa and Meshtastic operation. Computes EIRP from transmit power, antenna gain, and cable loss, then compares against FCC (US, 36 dBm), ETSI (EU, 16.15 dBm), ACMA (Australia, 30 dBm), IC (Canada, 36 dBm), and ARIB (Japan, 13 dBm) limits. Returns compliance status, margin in dB, and a warning message
| Parameter | Type | Required | Notes |
|---|---|---|---|
| tx_power_dbm | number | yes | Conducted transmit power at the radio output in dBm. Typical LoRa: 14-22 dBm. |
| antenna_gain_dbi | number | yes | Antenna gain in dBi. Stock Meshtastic antennas: 2-3 dBi. External: 6-10+ dBi. |
| cable_loss_db | number | no | Coaxial cable and connector loss in dB. Set 0 for devices with integrated antennas. |
| region | string | no | Regulatory region for EIRP limit lookup. FCC_US: 36 dBm, ETSI_EU: ~16 dBm, ACMA_AU: 30 dBm, IC_CA: 36 dBm, JP: 13 dBm. |
| custom_limit_dbm | number | no | Custom EIRP limit in dBm. Only used when region is 'custom'. |
Calculates Meshtastic node power consumption and battery runtime using device-specific power profiles and firmware role-based duty cycling. Models sleep, RX, and TX current draw for Heltec V3, RAK WisBlock, T-Beam, T-Beam Supreme, and Station G2 with GPS, BLE, and display peripheral toggles. Role selection (client, router, repeater, client_muted) controls the duty cycle model: routers stay in RX m
| Parameter | Type | Required | Notes |
|---|---|---|---|
| device | string | no | Meshtastic hardware device. Selects power consumption profile for sleep, RX, TX, GPS, and BLE. |
| channel_preset | string | no | Meshtastic channel preset. Affects TX airtime per message and thus power consumption. |
| battery_mah | number | no | Battery capacity in milliamp-hours. Common: 1100 (18650 min), 3000 (typical), 6000 (large). |
| battery_voltage | number | no | Nominal battery voltage. 3.7V for single-cell LiPo/Li-ion, 7.4V for 2S packs. |
| messages_per_hour | number | no | Expected messages sent and received per hour. Includes both TX and RX message events. |
| gps_enabled | boolean | no | Whether GPS is enabled. Significantly increases power draw on devices with built-in GPS. |
| bluetooth_enabled | boolean | no | Whether Bluetooth is enabled for phone connection. |
| role | string | no | Meshtastic node role. client: sleeps between events. router: always listening. repeater: always listening, no display/BLE. client_muted: aggressive sleep. |
Recommends optimal LoRa spreading factor, bandwidth, and TX power based on target range, terrain, and optimization priority. Iterates through all SF (7-12) and BW (125/250/500 kHz) combinations, computing achievable range, airtime, data rate, and battery impact for each. Ranks candidates by priority: 'range' maximizes distance, 'speed' minimizes airtime, 'battery' minimizes power consumption, 'bal
| Parameter | Type | Required | Notes |
|---|---|---|---|
| target_range_km | number | yes | Desired communication range in kilometers. |
| terrain | string | no | Terrain type for path loss model. open: line-of-sight, suburban: light buildings, urban: moderate buildings, dense_urban: city center, indoor: inside buildings. |
| max_payload_bytes | integer | no | Maximum payload size in bytes for airtime calculation. |
| priority | string | no | Optimization priority. range: maximize distance (high SF, low BW). speed: minimize airtime (low SF, high BW). battery: minimize power draw. balanced: best trade-off across all factors. |
| region | string | no | Regulatory region. Determines max TX power and duty cycle limit. |
| antenna_gain_dbi | number | no | Antenna gain in dBi. 2.15 = half-wave dipole reference. |
Calculate usable ZFS pool capacity for any RAID level including stripe, mirror, raidz1, raidz2, and raidz3. Computes raw capacity, parity overhead, data disk count, usable terabytes after ZFS metadata overhead (checksums, block pointers, uberblocks), and storage efficiency percentage. Essential for planning NAS builds, TrueNAS/ZFS server storage, and estimating how much usable space a given disk c
| Parameter | Type | Required | Notes |
|---|---|---|---|
| disk_count | integer | yes | Total number of physical disks in the pool |
| disk_size_tb | number | yes | Size of each individual disk in terabytes |
| raid_type | string | no | ZFS RAID level: stripe (no redundancy), mirror (2-way), raidz1/2/3 (single/double/triple parity) |
| record_size_kb | number | no | ZFS record size in kilobytes, affects compression and performance |
| metadata_overhead_pct | number | no | Percentage of raw capacity consumed by ZFS metadata, checksums, and internal structures |
Calculate recommended RAM and ARC sizing for a ZFS storage pool based on workload type, pool size, deduplication status, and L2ARC cache size. Computes minimum and recommended RAM in gigabytes, ARC target size, and dedup table overhead. Accounts for workload-specific IO patterns: NAS (sequential, 1GB/TB), database (random, 2GB/TB), virtualization (mixed, 1.5GB/TB). Deduplication adds approximately
| Parameter | Type | Required | Notes |
|---|---|---|---|
| pool_size_tb | number | yes | Total usable pool size in terabytes |
| workload | string | no | Primary workload type: general (mixed), nas (sequential reads/writes), database (random IO), virtualization (mixed random) |
| dedup_enabled | boolean | no | Whether ZFS deduplication is enabled (significantly increases RAM requirements) |
| l2arc_size_gb | number | no | Size of L2ARC (read cache SSD) in gigabytes; requires additional RAM for index |
Calculate maximum TCP throughput using the Bandwidth-Delay Product (BDP) formula. Given link bandwidth and round-trip latency, computes the BDP (maximum in-flight data), achievable throughput with a given TCP window size, link utilization percentage, and recommended window size for full utilization. Critical for diagnosing slow transfers over high-latency links (WAN, VPN, satellite), tuning TCP bu
| Parameter | Type | Required | Notes |
|---|---|---|---|
| bandwidth_mbps | number | yes | Available link bandwidth in megabits per second |
| rtt_ms | number | yes | Round-trip time (latency) in milliseconds |
| window_size_kb | number | no | TCP receive window size in kilobytes |
| mss_bytes | number | no | Maximum Segment Size in bytes (typically 1460 for Ethernet) |
Calculate the optimal MTU for a WireGuard VPN tunnel interface with a detailed overhead breakdown. Accounts for WireGuard header (32 bytes), outer IP header (20 bytes IPv4 or 40 bytes IPv6), UDP header (8 bytes), and optional PPPoE encapsulation (8 bytes). Prevents fragmentation and PMTUD black holes by computing the maximum inner packet size that fits within the physical link MTU. Essential for W
| Parameter | Type | Required | Notes |
|---|---|---|---|
| interface_mtu | integer | no | MTU of the underlying physical or virtual network interface in bytes |
| ipv6 | boolean | no | Whether the outer (transport) IP header uses IPv6 (40 bytes) instead of IPv4 (20 bytes) |
| over_pppoe | boolean | no | Whether the link uses PPPoE encapsulation (adds 8 bytes of overhead) |
Calculate IPv4 subnet details from CIDR notation. Parses a CIDR block (e.g. 192.168.1.0/24) and returns the network address, broadcast address, subnet mask, wildcard mask, first and last usable host addresses, total and usable host counts, prefix length, and classful IP class (A/B/C/D/E). Essential for homelab network planning, VLAN segmentation, firewall rule design, and understanding address spa
| Parameter | Type | Required | Notes |
|---|---|---|---|
| cidr | string | yes | IPv4 address in CIDR notation, e.g. 192.168.1.0/24 |
Estimate RAID array IOPS performance and latency for ZFS and traditional RAID configurations. Calculates maximum read IOPS, write IOPS (accounting for write penalty/amplification per RAID level), blended IOPS for a configurable read/write workload mix, and rough per-disk latency. Supports stripe, mirror, raidz1, raidz2, and raidz3. Use with HDD IOPS (~150), SATA SSD (~50000), or NVMe SSD (~100000)
| Parameter | Type | Required | Notes |
|---|---|---|---|
| disk_count | integer | yes | Total number of physical disks in the array |
| disk_iops | number | no | IOPS per individual disk. Typical values: HDD ~150, SATA SSD ~50000, NVMe SSD ~100000 |
| raid_type | string | no | RAID level: stripe (no redundancy, write penalty 1), mirror (write penalty 2), raidz1 (write penalty 2), raidz2 (write penalty 3), raidz3 (write penalty 4) |
| read_pct | number | no | Percentage of workload that is reads (0-100). Typical: 70 for mixed, 90 for read-heavy, 30 for write-heavy |
Calculate total power consumption, electricity cost, and circuit requirements for a homelab. Enter each device's wattage to get daily/monthly/yearly kWh and cost at your local electricity rate. Accounts for cooling overhead via PUE (Power Usage Effectiveness). Shows amperage draw at 120V and 240V and warns if you exceed the NEC 80% continuous load limit on a 15A breaker. Essential for budgeting ho
| Parameter | Type | Required | Notes |
|---|---|---|---|
| devices | array | yes | List of devices with their wattage |
| hours_per_day | number | no | Hours per day the devices are running |
| kwh_rate_cents | number | no | Electricity cost in cents per kilowatt-hour |
| pue | number | no | Power Usage Effectiveness — ratio of total facility power to IT equipment power. 1.0 means no cooling overhead, 1.2 is typical for a home server closet, 1.5+ for poorly ventilated spaces |
Estimate the cooling load (BTU/hr) for a homelab or server closet based on equipment wattage, room dimensions, insulation quality, and solar exposure. All electrical power converts to heat — this tool calculates equipment heat output, envelope heat gain through walls, and solar gain to produce a total BTU/hr cooling requirement. Recommends AC tonnage, mini-split sizing (rounded to standard 6K BTU
| Parameter | Type | Required | Notes |
|---|---|---|---|
| total_watts | number | yes | Total power consumption in watts — all power becomes heat |
| room_length_ft | number | no | Room length in feet |
| room_width_ft | number | no | Room width in feet |
| room_height_ft | number | no | Room ceiling height in feet |
| insulation | string | no | Wall/ceiling insulation quality: poor (uninsulated garage), average (standard drywall), good (insulated interior), excellent (server room with vapor barrier) |
| ambient_temp_f | number | no | Ambient temperature outside the room in degrees Fahrenheit |
| target_temp_f | number | no | Desired room temperature in degrees Fahrenheit |
| sun_exposure | string | no | Solar heat gain: none (interior/basement room), partial (one exterior wall with window), full (multiple sun-facing windows) |
Quick rack space and weight sizing calculator for homelab and small data center racks. Enter your devices with their height in rack units, weight, and wattage to get total utilization, remaining free space, weight totals in lbs and kg, and recommended PDU count based on the NEC 80% continuous load rule (1920W per 20A/120V PDU). Estimates cable management overhead at 2U per 10U of installed gear. O
| Parameter | Type | Required | Notes |
|---|---|---|---|
| rack_units | integer | no | Total rack height in rack units (standard is 42U) |
| devices | array | yes | List of devices to place in the rack |
Plan and validate network link capacity for homelab workloads. Determine whether a 1G, 2.5G, 10G, or faster link can handle your concurrent streams (VMs, backups, media, iSCSI). Calculates effective bandwidth after TCP/IP overhead, total required bandwidth, utilization percentage, and remaining headroom. Flags saturation at 80% utilization and identifies whether the bottleneck is network or storag
| Parameter | Type | Required | Notes |
|---|---|---|---|
| link_speed_gbps | number | yes | Network link speed in gigabits per second (e.g. 1, 2.5, 5, 10, 25, 40, 100) |
| concurrent_streams | integer | no | Number of concurrent data streams / transfers |
| stream_bandwidth_mbps | number | no | Bandwidth required per stream in megabits per second |
| protocol_overhead_pct | number | no | TCP/IP protocol overhead as a percentage (typically 3-5% for TCP, ~1% for UDP) |
| storage_throughput_mbps | number | no | Maximum storage read/write throughput in megabits per second. If provided, checks whether storage is the bottleneck |
Estimate steady-state thermal behaviour of a rectangular enclosure (server rack, electronics housing, equipment cabinet) using a lumped-parameter energy balance with natural-convection and radiation correlations, or forced-flow air energy balance. Accepts enclosure dimensions, heat source positions and wattages, and airflow configuration. Returns temperature extremes, estimated hotspot location, a
| Parameter | Type | Required | Notes |
|---|---|---|---|
| length_m | number | yes | Enclosure length (X) in metres |
| width_m | number | yes | Enclosure width (Y) in metres |
| height_m | number | yes | Enclosure height (Z) in metres |
| heat_sources | array | yes | Heat sources inside the enclosure |
| flow_type | string | yes | Airflow type |
| inlet_velocity_ms | number | no | Inlet air velocity in m/s (required for forced flow) |
| inlet_position | string | no | Inlet location |
| outlet_position | string | no | Outlet location |
| ambient_temp_c | number | no | Ambient air temperature in Celsius |
| mesh_density | string | no | Mesh density — coarse (~50K cells), medium (~200K), fine (~500K) |
Analyze a forced-convection fin-array heatsink using established channel-flow correlations (developing laminar Nusselt, fin efficiency tanh(mH)/mH, parallel-plate friction). Computes base-to-air thermal resistance, pressure drop, base and fin-tip temperatures, fin efficiency, and the optimal fin spacing for the given airflow. Use for heatsink selection and first-pass optimization in electronics co
| Parameter | Type | Required | Notes |
|---|---|---|---|
| base_length_m | number | yes | Heatsink base length in metres |
| base_width_m | number | yes | Heatsink base width in metres |
| base_height_m | number | yes | Base plate thickness in metres |
| fin_count | integer | yes | Number of fins |
| fin_height_m | number | yes | Fin height in metres |
| fin_thickness_m | number | yes | Fin thickness in metres |
| airflow_velocity_ms | number | yes | Incoming airflow velocity in m/s |
| heat_load_w | number | yes | Total heat load applied to base in watts |
| ambient_temp_c | number | no | Ambient air temperature in Celsius |
| mesh_density | string | no | Mesh density |
Estimate PCB component temperatures by solving a thermal resistance network (thermal↔electrical analogy) with the built-in MNA solver. Each component gets a junction node (package θjb from a typical-datasheet table), a local board node coupled to its neighbours through in-plane FR4/copper conduction, and convection to ambient. Computes per-component junction and case temperatures, board extremes,
| Parameter | Type | Required | Notes |
|---|---|---|---|
| board_length_m | number | yes | Board length in metres |
| board_width_m | number | yes | Board width in metres |
| board_thickness_m | number | no | Board thickness in metres (default 1.6mm FR4) |
| components | array | yes | Components on the board |
| airflow_velocity_ms | number | no | Airflow velocity in m/s (0 = natural convection) |
| ambient_temp_c | number | no | Ambient temperature in Celsius |
| mesh_density | string | no | Mesh density |
Calculates battery runtime and energy capacity given cell capacity in mAh, nominal voltage, and average current draw. Accounts for real-world discharge efficiency (Peukert-adjacent derating) to produce effective capacity, total energy in Wh, and runtime in hours and days. Useful for IoT sensor node planning, portable device design, UPS hold-up estimation, and solar battery bank cycling analysis. O
| Parameter | Type | Required | Notes |
|---|---|---|---|
| capacity_mah | number | yes | Battery capacity in milliamp-hours (mAh) |
| voltage | number | no | Nominal battery voltage (V), default 3.7 for Li-ion |
| current_draw_ma | number | yes | Average current draw in milliamps (mA) |
| efficiency | number | no | Discharge efficiency factor (0-1), accounts for conversion losses and derating, default 0.85 |
Determines the minimum AWG (American Wire Gauge) conductor size for a given current, voltage, one-way cable distance, and maximum allowable voltage drop percentage. Supports copper and aluminum conductors. Computes round-trip resistance, actual voltage drop in volts and percent, and wire cross-sectional area. Essential for DC solar runs, battery bank wiring, EV charging circuits, and low-voltage l
| Parameter | Type | Required | Notes |
|---|---|---|---|
| current_amps | number | yes | Load current in amperes (A) |
| voltage | number | yes | System voltage (V) |
| distance_m | number | yes | One-way conductor distance in meters |
| max_drop_pct | number | no | Maximum allowable voltage drop as percentage (default 3%) |
| conductor | string | no | Conductor material: copper or aluminum |
Sizes an off-grid solar power system by calculating the number of panels and battery bank capacity required for a given daily energy consumption. Accounts for system losses (inverter, wiring, charge controller), battery depth-of-discharge, and autonomy days for cloudy weather. Outputs panel count, total panel wattage, battery capacity in kWh and Ah, and minimum charge controller amperage (with 25%
| Parameter | Type | Required | Notes |
|---|---|---|---|
| daily_kwh | number | yes | Daily energy consumption in kilowatt-hours (kWh) |
| peak_sun_hours | number | no | Average peak sun hours per day for your location (hours) |
| panel_watts | number | no | Rated wattage per solar panel (W) |
| system_voltage | number | no | Battery bank system voltage: 12, 24, or 48 V |
| battery_autonomy_days | number | no | Number of days the battery bank should sustain load without solar input |
| dod | number | no | Battery depth of discharge (0-1), default 0.8 for LiFePO4 |
| system_efficiency | number | no | Overall system efficiency (0-1), accounts for inverter, wiring, and controller losses |
Estimates UPS (Uninterruptible Power Supply) backup runtime from battery specifications and connected load. Takes VA rating, watt rating, load in watts, and battery configuration (count, voltage, amp-hours) to compute effective stored energy after efficiency losses and runtime in minutes and hours. Detects overload conditions when load exceeds the UPS watt rating. Calculates power factor from VA/W
| Parameter | Type | Required | Notes |
|---|---|---|---|
| va_rating | number | yes | UPS VA (volt-ampere) rating |
| watt_rating | number | yes | UPS real power (watt) rating |
| load_watts | number | yes | Connected load in watts |
| battery_count | integer | no | Number of batteries in the UPS |
| battery_voltage | number | no | Voltage per battery (V) |
| battery_ah | number | no | Capacity per battery in amp-hours (Ah) |
| efficiency | number | no | Inverter/conversion efficiency (0-1), default 0.9 |
Converts battery capacity from milliamp-hours (mAh) to watt-hours (Wh), kilowatt-hours (kWh), and joules (J) given the nominal cell voltage. This is the most common battery unit conversion needed when comparing cells rated in mAh (e.g. 18650, AA) against energy budgets specified in Wh. Essential for airline lithium battery compliance (100 Wh limit for carry-on), solar battery bank sizing, and UPS
| Parameter | Type | Required | Notes |
|---|---|---|---|
| capacity_mah | number | yes | Battery capacity in milliamp-hours (mAh) |
| voltage_v | number | yes | Nominal battery voltage (V) |
Converts electrical power in watts to current in amps (and milliamps) for a given voltage, using the DC power formula P = V * I. Also computes the implied load resistance via Ohm's law (R = V / I) assuming a purely resistive load. This is the most common electrical conversion for circuit design, fuse selection, wire sizing, and breaker rating. Use the output amps value to feed into wire_gauge for
| Parameter | Type | Required | Notes |
|---|---|---|---|
| watts | number | yes | Power in watts (W) |
| voltage_v | number | yes | Voltage in volts (V) |
Calculates voltage drop across a conductor run given current, wire length, AWG gauge, system voltage, and conductor material (copper or aluminum). Computes round-trip resistance, voltage drop in volts and percent, voltage at the load end, power dissipated in the wire, and NEC compliance flags (3% max for branch circuits, 5% max for feeders). Use this after wire_gauge to verify a specific gauge mee
| Parameter | Type | Required | Notes |
|---|---|---|---|
| current_amps | number | yes | Load current in amperes (A) |
| wire_length_m | number | yes | One-way wire length in meters |
| wire_gauge_awg | number | yes | Wire gauge in AWG (e.g. 14, 12, 10; use negative for large gauges: -3 = 4/0) |
| voltage_v | number | yes | System voltage (V) |
| conductor | string | no | Conductor material: copper or aluminum |
Estimates battery charge time given capacity in mAh, charge current in mA, charger efficiency, and initial state of charge. Accounts for real-world charging losses (typically 80-90% efficient) to produce time in hours and minutes, energy required in Wh (at an optional voltage, default 3.7V for Li-ion), and the C-rate of the charge. Useful for solar charge controller sizing, USB charging time estim
| Parameter | Type | Required | Notes |
|---|---|---|---|
| capacity_mah | number | yes | Total battery capacity in milliamp-hours (mAh) |
| charge_current_ma | number | yes | Charge current in milliamps (mA) |
| efficiency | number | no | Charger efficiency factor (0-1), default 0.85 |
| initial_soc_pct | number | no | Initial state of charge as percentage (0-100), default 0 (empty) |
| voltage_v | number | no | Nominal battery voltage for energy calculation (V), default 3.7 for Li-ion |
Calculates total daily energy consumption from an appliance list — the critical first step before sizing solar panels or batteries. Enter each appliance with its wattage, hours of daily use, and quantity. Outputs total daily kWh (with configurable safety margin for surge and inrush current), peak simultaneous wattage, and recommended inverter VA rating per NEC 125% continuous load rule. Feeds dire
| Parameter | Type | Required | Notes |
|---|---|---|---|
| appliances | array | yes | List of appliances with wattage, hours per day, and quantity |
| safety_margin_pct | number | no | Safety margin percentage to account for surge/inrush current, default 20% |
Calculates solar system return on investment, payback period, and levelized cost of energy (LCOE). Models year-by-year savings accounting for panel degradation, utility rate inflation, federal Investment Tax Credit (ITC), state rebates, and annual maintenance. Outputs net cost after incentives, payback year, total lifetime savings, ROI percentage, and LCOE in cents/kWh. Essential for residential a
| Parameter | Type | Required | Notes |
|---|---|---|---|
| system_cost_usd | number | yes | Total installed system cost in USD |
| system_size_kw | number | yes | System size in kilowatts (kW) |
| annual_production_kwh | number | yes | Estimated annual energy production in kWh (from PVWatts or system_size_kw * peak_sun_hours * 365 * 0.80) |
| electricity_rate_cents | number | no | Current electricity rate in cents per kWh, default 15 |
| annual_rate_increase_pct | number | no | Annual utility rate increase percentage, default 3% |
| federal_itc_pct | number | no | Federal Investment Tax Credit percentage, default 30% (US ITC) |
| state_rebate_usd | number | no | State or local rebate amount in USD, default 0 |
| annual_degradation_pct | number | no | Annual panel degradation rate, default 0.5% per year |
| annual_maintenance_usd | number | no | Annual maintenance cost in USD, default $100 |
| system_lifetime_years | integer | no | System lifetime in years, default 25 |
Calculates how many days a battery bank can sustain loads without solar input — critical for off-grid and backup power sizing. Accounts for depth of discharge, round-trip efficiency (lithium vs lead-acid), minimum state of charge, and optional partial solar contribution during cloudy weather. Outputs autonomy in days and hours, usable capacity, and daily deficit. Use with avg_solar_contribution_pc
| Parameter | Type | Required | Notes |
|---|---|---|---|
| daily_kwh | number | yes | Daily energy consumption in kilowatt-hours (kWh) |
| battery_kwh | number | yes | Total installed battery capacity in kWh |
| dod | number | no | Depth of discharge (0-1), default 0.8 for lithium |
| round_trip_efficiency | number | no | Battery round-trip efficiency (0-1), default 0.90 for lithium, use 0.80 for lead-acid |
| min_soc_pct | number | no | Minimum state of charge percentage, default 20% |
| avg_solar_contribution_pct | number | no | Average solar contribution during autonomy period (0-100%), default 0 for worst-case |
Calculates optimal solar panel string and MPPT configuration based on panel electrical specs, inverter/charge-controller MPPT limits, and site temperature extremes. Applies temperature coefficients to determine Voc at minimum temperature (cold) and Vmp at maximum temperature (hot), then computes the safe range of panels per string, maximum parallel strings, and total array wattage. Prevents over-v
| Parameter | Type | Required | Notes |
|---|---|---|---|
| panel_voc | number | yes | Panel open circuit voltage (Voc) at STC in volts |
| panel_vmp | number | yes | Panel maximum power voltage (Vmp) at STC in volts |
| panel_isc | number | yes | Panel short circuit current (Isc) at STC in amps |
| panel_imp | number | yes | Panel maximum power current (Imp) at STC in amps |
| mppt_vmax | number | yes | Maximum MPPT input voltage in volts |
| mppt_vmin | number | yes | Minimum MPPT start/operating voltage in volts |
| mppt_imax | number | yes | Maximum MPPT input current in amps |
| temp_min_c | number | no | Minimum expected site temperature in Celsius, default -10 |
| temp_max_c | number | no | Maximum expected cell temperature in Celsius, default 60 |
| temp_coeff_voc_pct_per_c | number | no | Voc temperature coefficient in %/C (negative for silicon), default -0.30 |
Compares total cost of ownership between a fuel generator and a solar+battery system over a configurable time horizon. Calculates yearly and cumulative costs for generator-only, solar-only (amortized), and hybrid scenarios. Accounts for fuel cost, generator consumption rate, maintenance intervals, solar system amortization, and battery coverage. Outputs yearly costs, total savings, breakeven year,
| Parameter | Type | Required | Notes |
|---|---|---|---|
| generator_fuel_cost_per_gallon | number | no | Fuel cost per gallon in USD, default $3.50 |
| generator_consumption_gph | number | no | Generator fuel consumption in gallons per hour at load, default 1.0 |
| generator_hours_per_day | number | no | Generator runtime hours per day, default 8 |
| generator_maintenance_per_1000hrs | number | no | Generator maintenance cost per 1000 running hours in USD, default $200 |
| solar_system_cost_usd | number | yes | Total solar+battery system cost in USD |
| solar_daily_kwh_produced | number | yes | Daily solar energy production in kWh |
| battery_kwh | number | no | Battery storage capacity in kWh (0 means no battery, generator needed at night), default 0 |
| daily_kwh_needed | number | yes | Total daily energy requirement in kWh |
| years_to_compare | integer | no | Number of years to compare, default 10 |
Determine minimum wire gauge using NEC Table 310.16 ampacity ratings with full derating. Looks up base ampacity for copper or aluminum conductors at 60°C, 75°C, or 90°C insulation rating, then applies NEC 310.15(C)(1) ambient temperature correction and NEC 310.15(C)(2) conductor count adjustment. Automatically applies the 125% continuous load factor per NEC 210.20(A) when flagged. Returns the mini
| Parameter | Type | Required | Notes |
|---|---|---|---|
| current_amps | number | yes | Required circuit current in amperes. Use 125% of continuous load per NEC 210.20(A). |
| conductor | string | no | Conductor material. Copper has higher ampacity; aluminum is lighter and cheaper for large feeders. |
| insulation | string | no | Insulation temperature rating in °C. 60=TW/UF-B, 75=THW/THWN/XHHW (most common), 90=THHN/THWN-2. |
| ambient_temp_c | number | no | Ambient temperature in °C. NEC base is 30°C. Higher temps require derating. Typical: 30 (indoor), 40 (attic/hot), 45+ (rooftop conduit). |
| conductors_in_raceway | integer | no | Number of current-carrying conductors in a single raceway or cable. More than 3 requires derating per NEC 310.15(C)(2). |
| continuous_load | boolean | no | Whether the load operates continuously (3+ hours). NEC requires 125% sizing for continuous loads. Set false for intermittent loads. |
Size a DC-to-AC inverter for off-grid solar, battery backup, or mobile power systems. Computes the required continuous VA rating from total load watts and power factor, estimates surge capacity for motor-starting loads (3-7x rated power), applies NEC-recommended 20% derating for continuous operation, and selects the nearest standard inverter size. Also calculates DC input current at the system vol
| Parameter | Type | Required | Notes |
|---|---|---|---|
| continuous_watts | number | yes | Total continuous load in watts. Sum of all appliances that may run simultaneously. Chain from solar_load_audit.peak_watts. |
| surge_watts | number | no | Peak surge/starting load in watts. Motors and compressors draw 3-7x rated watts on startup. If omitted, estimated as 3x the largest single load or 2x continuous, whichever is greater. |
| largest_load_watts | number | no | Wattage of the single largest appliance. Used to estimate surge if surge_watts is not provided. Chain from solar_load_audit.largest_load_watts. |
| system_voltage | string | no | DC system voltage. 12V for small/mobile, 24V for medium, 48V for large residential/commercial. Higher voltage = lower current = thinner cables. |
| power_factor | number | no | Power factor (0.5-1.0). Resistive loads (heaters, lights) are ~1.0. Motor loads (fridge, AC, pump) are 0.6-0.8. Mixed loads typically 0.8. |
| efficiency | number | no | Inverter efficiency (0.5-1.0). Good pure-sine inverters are 0.90-0.95. Modified-sine are 0.85-0.90. Budget units may be lower. |
| derating_pct | number | no | Derating percentage for temperature, altitude, and safety margin. NEC recommends 20% (80% continuous rating). Range 0-50%. |
Turn a SPICE netlist into a fab-ready 2-layer PCB: assigns real footprints (0805, TO-92, DO-35, DIP-8, headers, LED, radial-cap), auto-places components (connectivity-aware; or use your own placement), routes a 2-layer maze router with vias, and VERIFIES the result with DRC (clearance/crossing checks) and ERC (union-find copper connectivity proven against the netlist). Returns the board, routing s
| Parameter | Type | Required | Notes |
|---|---|---|---|
| netlist | string | yes | SPICE netlist (same format as spice_simulate). Components + nets are extracted; .model/.tran/etc. ignored. |
| placement | array | no | Optional manual placement; omit for connectivity-aware auto-placement (best of N seeds). |
| board | object | no | Optional board size in mm; auto-sized if omitted |
| clearance_mm | number | no | Minimum copper clearance in mm |
| trace_width_mm | number | no | Routing trace width in mm |
| gnd_pour | boolean | no | Treat GND as a bottom-layer pour (unions all GND pads for ERC) |
| gerber | boolean | no | Also return Gerber RS-274X + Excellon drill files |
Calculates output voltage, current draw, and power dissipation for a resistive voltage divider. Given an input voltage Vin and two resistor values R1 (upper) and R2 (lower), computes Vout = Vin * R2 / (R1 + R2), divider current, individual resistor power dissipation, and the division ratio. Essential for biasing circuits, level shifting, ADC input scaling, and feedback networks. Use before trace_w
| Parameter | Type | Required | Notes |
|---|---|---|---|
| vin | number | yes | Input voltage in volts (V). Must be positive. |
| r1_ohm | number | yes | Upper resistor value in ohms (R1), connected between Vin and Vout node. |
| r2_ohm | number | yes | Lower resistor value in ohms (R2), connected between Vout node and ground. |
Computes the cutoff frequency, time constant, impedance, and phase shift of a first-order RC filter. Supports both lowpass and highpass topologies. The cutoff frequency is f = 1/(2*pi*R*C) where the signal is attenuated by 3 dB. The time constant tau = R*C governs transient response — the capacitor reaches 63.2% of its final value after one tau. Use for anti-aliasing before ADCs, DC blocking, nois
| Parameter | Type | Required | Notes |
|---|---|---|---|
| resistance_ohm | number | yes | Resistance in ohms (R). The resistive element of the RC filter. |
| capacitance_f | number | yes | Capacitance in farads (C). The capacitive element of the RC filter. |
| filter_type | string | no | Filter topology: 'lowpass' (R then C to ground) or 'highpass' (C then R to ground). |
Calculates the resonant frequency of an LC circuit, along with optional Q factor and bandwidth when series resistance is provided. The resonant frequency f0 = 1/(2*pi*sqrt(L*C)) is where inductive and capacitive reactances cancel. Used for designing tank circuits, oscillators, bandpass filters, and antenna matching networks. If resistance R is given, computes quality factor Q = (1/R)*sqrt(L/C) and
| Parameter | Type | Required | Notes |
|---|---|---|---|
| inductance_h | number | yes | Inductance in henries (H). The inductive element of the LC circuit. |
| capacitance_f | number | yes | Capacitance in farads (F). The capacitive element of the LC circuit. |
| resistance_ohm | number | no | Optional series resistance in ohms for Q factor and bandwidth calculation. Omit for ideal LC analysis. |
Designs an L-network impedance matching circuit between two real impedances at a given frequency. Computes the required shunt and series reactive components (inductor and capacitor) to transform the source impedance to the load impedance. The network Q factor is sqrt(Rh/Rl - 1) where Rh is the higher impedance. Topology is automatically selected: the shunt element is placed across the higher imped
| Parameter | Type | Required | Notes |
|---|---|---|---|
| source_ohm | number | yes | Source impedance in ohms (real, resistive). Must differ from load impedance. |
| load_ohm | number | yes | Load impedance in ohms (real, resistive). Must differ from source impedance. |
| freq_mhz | number | yes | Design frequency in megahertz for component value calculation. |
Calculates the minimum PCB trace width for a given current using the IPC-2221 standard formula. The IPC-2221 empirical equation relates current capacity to cross-sectional area and temperature rise: I = k * dT^0.44 * A^0.725, where k=0.048 for external layers and k=0.024 for internal layers. Supports configurable copper weight (oz/ft^2) and temperature rise. Also computes approximate DC resistance
| Parameter | Type | Required | Notes |
|---|---|---|---|
| current_amps | number | yes | Required current capacity in amperes (A). |
| copper_oz | number | no | Copper weight in ounces per square foot. 1 oz/ft^2 = 1.37 mil (34.8 um) thickness. Common values: 0.5, 1, 2. |
| temp_rise_c | number | no | Allowable temperature rise above ambient in degrees Celsius. IPC-2221 standard uses 10, 20, or 30 C. |
| layer | string | no | PCB layer type. External layers dissipate heat better (k=0.048); internal layers use k=0.024. |
Solves Ohm's Law and the power equation given any two of four electrical quantities: voltage (V), current (I), resistance (R), and power (P). Uses V=IR, P=VI, P=I^2R, and P=V^2/R to derive the missing two values. Fundamental for every circuit design task: sizing resistors, estimating current draw, checking power dissipation, and verifying component ratings. Chain into led_resistor for LED circuits
| Parameter | Type | Required | Notes |
|---|---|---|---|
| voltage_v | number | no | Voltage in volts (V). Provide exactly 2 of the 4 parameters. |
| current_a | number | no | Current in amps (A). Provide exactly 2 of the 4 parameters. |
| resistance_ohm | number | no | Resistance in ohms. Provide exactly 2 of the 4 parameters. |
| power_w | number | no | Power in watts (W). Provide exactly 2 of the 4 parameters. |
Decodes 4-band or 5-band resistor color codes into resistance value, tolerance, and min/max range. Accepts an ordered array of color names (left-to-right as printed on the resistor body). Supports standard EIA color codes including gold and silver multiplier/tolerance bands. Outputs the nominal resistance in ohms, a human-readable formatted value (e.g. '4.7kΩ'), tolerance percentage, and the min/m
| Parameter | Type | Required | Notes |
|---|---|---|---|
| bands | array | yes | Array of 4 or 5 color band names from left to right. 4-band: [digit1, digit2, multiplier, tolerance]. 5-band: [digit1, digit2, digit3, multiplier, tolerance]. |
Calculates the current-limiting resistor for driving one or more LEDs in series from a DC supply. Computes the exact resistance from R = (Vsupply - n*Vf) / I, then selects the nearest E24 standard resistor value. Reports the actual current with the standard resistor, power dissipation, and voltage across the resistor. Supports series LED strings by specifying led_count. Validates that supply volta
| Parameter | Type | Required | Notes |
|---|---|---|---|
| supply_voltage_v | number | yes | Supply voltage in volts (V). Must be positive. |
| led_forward_v | number | no | LED forward voltage in volts (V). Defaults to 2.0V (typical red LED). |
| led_current_ma | number | no | Desired LED current in milliamps (mA). Defaults to 20mA. |
| led_count | integer | no | Number of LEDs in series. Defaults to 1. |
Calculates timing parameters for the ubiquitous NE555 / LM555 timer IC in astable (free-running oscillator) and monostable (one-shot pulse) modes. In astable mode, computes frequency, period, duty cycle, and HIGH/LOW durations from R1, R2, and C using f = 1.44 / ((R1 + 2·R2) · C). In monostable mode, computes pulse width from R and C using t = 1.1 · R · C. Standard 555 astable duty cycle is always
| Parameter | Type | Required | Notes |
|---|---|---|---|
| mode | string | yes | Operating mode. 'astable' produces a continuous square wave. 'monostable' produces a single timed pulse. |
| r1_ohm | number | yes | Resistance R1 in ohms. In astable mode this is the charge-path resistor between Vcc and the discharge pin. In monostable mode this is the timing resistor. |
| r2_ohm | number | no | Resistance R2 in ohms (astable mode only). Charge/discharge resistor between the discharge and threshold pins. Required for astable mode. |
| c_farad | number | yes | Timing capacitor in farads. Typical values range from 1 pF to 1000 µF. Use scientific notation, e.g. 1e-6 for 1 µF. |
Calculate voltage gain and output for operational amplifier circuits in inverting, non-inverting, and differential configurations. For inverting: Av = -Rf/Ri with input impedance equal to Ri. For non-inverting: Av = 1 + Rf/Rg with very high input impedance. For differential: Av = Rf/Ri applied to (V1 - V2). Reports gain in linear and dB, output voltage when input is provided, input impedance, and
| Parameter | Type | Required | Notes |
|---|---|---|---|
| topology | string | yes | Op-amp circuit topology. 'inverting' uses Rf/Ri feedback with input to inverting terminal. 'non_inverting' applies input to non-inverting terminal with Rf/Rg feedback. 'differential' amplifies the vol |
| rf_ohm | number | yes | Feedback resistor Rf in ohms. Sets gain magnitude in all topologies. |
| ri_ohm | number | yes | Input/gain resistor in ohms. For inverting: input resistor Ri. For non-inverting: ground resistor Rg. For differential: input resistor on both channels. |
| vin_v | number | no | Input voltage in volts (optional). When provided, computes actual output voltage. For differential topology, this is V1 (non-inverting input). |
| vin2_v | number | no | Second input voltage in volts (differential topology only). This is V2 (inverting input). |
Calculates RC capacitor charge timing, energy storage, and transient voltages. Given resistance, capacitance, supply voltage, and optional initial voltage, computes the RC time constant (τ = R×C), time to reach standard charge thresholds (63%, 86%, 95%, 99%), voltage at key time points, energy stored (E = ½CV²), and peak charging current. Optionally calculates time to reach a specific target volta
| Parameter | Type | Required | Notes |
|---|---|---|---|
| resistance_ohm | number | yes | Series resistance in ohms (R). Controls charge/discharge rate. |
| capacitance_f | number | yes | Capacitance in farads (C). Use scientific notation, e.g. 1e-6 for 1 µF. |
| v_supply | number | yes | Supply voltage in volts. The voltage the capacitor charges toward. |
| v_initial | number | no | Initial capacitor voltage in volts (default 0 for fully discharged). |
| v_target | number | no | Target voltage to reach in volts (optional). When provided, calculates time to reach this voltage. Must be between v_initial and v_supply. |
Calculate PCB via current-carrying capacity using the IPC-2221 standard. A plated via is a hollow copper cylinder whose cross-sectional area is the annular ring of plating: A = pi * (D - t) * t, where D is the drill diameter and t is plating thickness. The IPC-2221 empirical formula I = k * dT^0.44 * A^0.725 (k=0.048) then gives the maximum current for a given temperature rise. Also computes via b
| Parameter | Type | Required | Notes |
|---|---|---|---|
| drill_diameter_mm | number | no | Via drill hole diameter in millimeters. Common values: 0.2 (microvia), 0.3 (standard), 0.4, 0.6, 0.8, 1.0. |
| plating_thickness_um | number | no | Copper plating thickness on the via barrel wall in micrometers. Standard is 25 um (IPC Class 2). Heavy plating is 50 um (IPC Class 3). |
| board_thickness_mm | number | no | Total PCB board thickness in millimeters. Standard 2-layer is 1.6 mm. Common values: 0.8, 1.0, 1.6, 2.0, 2.4. |
| temp_rise_c | number | no | Allowable temperature rise above ambient in degrees Celsius. IPC-2221 standard uses 10, 20, or 30 C. |
| target_current_a | number | no | Optional target current in amperes. When provided, calculates how many parallel vias are needed to carry this current safely. |
Select bypass and bulk decoupling capacitors for IC power supply pins. Computes the target PDN (Power Distribution Network) impedance from supply current, voltage, and allowable ripple using Z_target = V_ripple / I_total. Recommends a ceramic bypass capacitor (high-frequency decoupling, placed closest to IC pins) and a bulk capacitor (low-frequency decoupling, near the regulator). Calculates the c
| Parameter | Type | Required | Notes |
|---|---|---|---|
| supply_current_ma | number | yes | IC supply current draw in milliamps (mA). Use the maximum or typical from the datasheet. |
| supply_voltage_v | number | yes | Supply voltage in volts (V). Common values: 1.8, 2.5, 3.3, 5.0, 12.0. |
| switching_freq_mhz | number | no | Primary switching or clock frequency of the IC in MHz. Determines the target impedance frequency range. |
| max_ripple_mv | number | no | Maximum allowable supply ripple in millivolts (mV). Typical: 50 mV for digital, 10 mV for analog/RF. |
| num_ics | integer | no | Number of identical ICs sharing this supply rail. Scales the total current demand. |
| esr_mohm | number | no | Equivalent series resistance (ESR) of the ceramic bypass capacitor in milliohms. Typical MLCC: 5-20 mohm. |
Compute logarithms of a positive number in any base. Returns the custom-base logarithm, natural logarithm (ln), common logarithm (log10), and binary logarithm (log2). Useful for signal processing (decibel calculations), information theory (entropy in bits), pH chemistry, and general scientific computation. Uses the change-of-base formula log_b(x) = ln(x) / ln(b). Feeds into exponent_calc for inver
| Parameter | Type | Required | Notes |
|---|---|---|---|
| value | number | yes | The positive number to compute the logarithm of |
| base | number | no | The logarithm base (default 10). Must be positive and not equal to 1 |
Count significant figures in a number and optionally round to N significant figures. Accepts the number as a string to preserve trailing zeros (e.g. '1.200' has 4 sig figs). Applies standard sig fig rules: leading zeros do not count, trailing zeros after a decimal point count, trailing zeros before a decimal point are treated as significant. Also returns the number in scientific notation. Essentia
| Parameter | Type | Required | Notes |
|---|---|---|---|
| number_str | string | yes | The number as a string to preserve trailing zeros (e.g. '1.200') |
| round_to_n | integer | no | Optionally round the number to this many significant figures |
Convert any number to scientific notation and engineering notation. Returns the coefficient, exponent, a formatted string with Unicode superscripts (e.g. '3.14 × 10²'), and engineering notation where the exponent is a multiple of 3. Useful for expressing very large or very small values compactly, common in physics, electronics (picofarads, gigahertz), and astronomy. Accepts output from sig_figs an
| Parameter | Type | Required | Notes |
|---|---|---|---|
| value | number | yes | The number to convert to scientific notation |
Calculate what percentage one number is of another. Given a value and a total, returns the percentage, decimal form, and simplified fraction. For example, 3 out of 4 yields 75%, 0.75, and '3/4'. Commonly used for test scores, survey results, financial ratios, completion rates, and unit conversions. Chain with percentage_increase to compare successive measurements or use with test_grade for academi
| Parameter | Type | Required | Notes |
|---|---|---|---|
| value | number | yes | The part or numerator value |
| total | number | yes | The whole or denominator value (must not be zero) |
Calculate the percentage change between an old value and a new value. Determines whether the change is an increase or decrease, the absolute change, and the percentage change. Essential for financial analysis (stock price changes, revenue growth), scientific measurements (before/ after experiments), performance benchmarks, and population statistics. A positive percentage indicates growth; negative
| Parameter | Type | Required | Notes |
|---|---|---|---|
| old_value | number | yes | The original or starting value |
| new_value | number | yes | The new or ending value |
Compute the result of raising a base to an exponent (base^exponent). Handles positive and negative exponents, fractional exponents, and zero. Returns the numeric result and a scientific notation string for very large or very small results. Useful for compound interest calculations, exponential growth/decay models, physics power laws, and combinatorics. The inverse of log_calc; chain with scientifi
| Parameter | Type | Required | Notes |
|---|---|---|---|
| base | number | yes | The base number |
| exponent | number | yes | The exponent (power) to raise the base to |
Compute the square root of a non-negative number. Returns the decimal result, whether the input is a perfect square, and a simplified radical form (e.g. '√12' simplifies to '2√3'). For integer inputs, factors are extracted from under the radical sign. Useful for geometry (diagonal/hypotenuse calculations), statistics (standard deviation from variance), signal processing (RMS values), and general a
| Parameter | Type | Required | Notes |
|---|---|---|---|
| value | number | yes | The non-negative number to compute the square root of |
Calculate the circumference and area of a circle given either a radius or diameter. Provide one or both; if both are given, radius takes precedence. Returns circumference (C = 2πr), area (A = πr²), and both radius and diameter for completeness. Common in mechanical engineering (pulley systems, pipe sizing), electronics (antenna loop calculations, coil winding), civil engineering (manhole covers, c
| Parameter | Type | Required | Notes |
|---|---|---|---|
| radius | number | no | The radius of the circle (takes precedence over diameter) |
| diameter | number | no | The diameter of the circle |
Calculate the slope, y-intercept, line equation, angle, and distance between two points in a 2D Cartesian plane. Given coordinates (x1, y1) and (x2, y2), computes slope (rise/run), y-intercept, the equation in slope-intercept form (y = mx + b), angle in degrees relative to the x-axis, and Euclidean distance. Handles vertical and horizontal lines as special cases. Useful for surveying, civil engine
| Parameter | Type | Required | Notes |
|---|---|---|---|
| x1 | number | yes | X-coordinate of the first point |
| y1 | number | yes | Y-coordinate of the first point |
| x2 | number | yes | X-coordinate of the second point |
| y2 | number | yes | Y-coordinate of the second point |
Solve for any side of a right triangle using the Pythagorean theorem (a² + b² = c²). Provide any two of the three sides (a, b, c) and the missing side is computed. Also returns the triangle area (0.5 * a * b), perimeter, and confirms it is a right triangle. Side c is always the hypotenuse. Fundamental to surveying, construction (squaring corners), navigation (distance calculations), physics (vecto
| Parameter | Type | Required | Notes |
|---|---|---|---|
| a | number | no | Length of side a (leg) |
| b | number | no | Length of side b (leg) |
| c | number | no | Length of side c (hypotenuse) |
Calculate the p-value for a z-score or t-statistic. Supports one-tailed (left or right) and two-tailed hypothesis tests using either the standard normal distribution or the Student's t-distribution when degrees of freedom are specified. Returns significance flags at the 0.01, 0.05, and 0.10 alpha levels. Essential for interpreting results from t-tests, z-tests, ANOVA post-hoc comparisons, and regr
| Parameter | Type | Required | Notes |
|---|---|---|---|
| test_statistic | number | yes | The z-score or t-statistic from your hypothesis test. Positive values indicate the observed value is above the null hypothesis mean. |
| test_type | string | no | Tail type: one_tail_left (p from left), one_tail_right (p from right), or two_tail (both tails combined). |
| degrees_of_freedom | integer | no | Degrees of freedom for the t-distribution. Omit to use the standard normal (z) distribution. |
Calculate the confidence interval for a sample mean. Given a sample mean, sample size, standard deviation, and confidence level, computes the margin of error, lower and upper bounds, critical z-score, and standard error. Supports finite population correction (FPC) when a population size is provided, which narrows the interval for samples that are a large fraction of the population. Uses the Abramo
| Parameter | Type | Required | Notes |
|---|---|---|---|
| sample_mean | number | yes | The observed sample mean (x-bar) around which the confidence interval is centered. |
| sample_size | integer | yes | The number of observations in the sample (n). Must be a positive integer. |
| standard_deviation | number | yes | The standard deviation of the sample or population. Must be a positive number. |
| confidence_level | number | no | Confidence level as a decimal between 0 and 1 (e.g. 0.95 for 95%). Default is 0.95. |
| population_size | integer | no | Total population size for finite population correction (FPC). Omit for infinite population assumption. |
Calculates total cost including sales tax for a purchase. Given a unit price, tax rate percentage, and optional quantity, computes the subtotal (price times quantity), the tax amount rounded to two decimal places, and the final total. Useful for estimating purchase costs across US states and municipalities with different tax rates, comparing pre-tax and post-tax prices, and budgeting. Chain into s
| Parameter | Type | Required | Notes |
|---|---|---|---|
| price | number | yes | Unit price of the item in dollars (or any currency). Must be positive. |
| tax_rate_pct | number | no | Sales tax rate as a percentage (e.g. 8.875 for 8.875%). Defaults to 0 — enter your local rate. |
| quantity | integer | no | Number of items to purchase. Defaults to 1. |
Converts compensation between annual salary, monthly pay, weekly pay, and hourly wage. Accepts any of the four pay periods as input and derives all others. Uses configurable hours per week (default 40) and weeks per year (default 52). Daily rate assumes an 8-hour workday; monthly is annual divided by 12. Useful for comparing job offers quoted in different pay periods, freelance rate-setting, and b
| Parameter | Type | Required | Notes |
|---|---|---|---|
| amount | number | yes | The salary or wage amount to convert. |
| from_type | string | no | The pay period of the input amount. Defaults to 'annual'. |
| hours_per_week | number | no | Hours worked per week. Defaults to 40 for a standard full-time schedule. |
| weeks_per_year | number | no | Working weeks per year. Defaults to 52. Use 50 to account for 2 weeks unpaid vacation. |
Computes a full loan amortization schedule given principal, annual interest rate, and term in months. Returns the fixed monthly payment, total interest, total payments, and a month-by-month breakdown of principal vs interest. Supports optional extra monthly payments — shows months saved and interest saved. Works for mortgages (30yr/15yr), auto loans, personal loans, and student loans. All currency
| Parameter | Type | Required | Notes |
|---|---|---|---|
| principal | number | yes | Loan principal amount in dollars (or any currency unit). |
| annual_rate_pct | number | yes | Annual interest rate as a percentage (e.g., 6.5 for 6.5%). |
| term_months | integer | yes | Loan term in months. Max 600 (50 years). Common values: 360 (30yr), 180 (15yr), 60 (5yr auto). |
| extra_payment | number | no | Optional fixed extra monthly payment toward principal. Defaults to 0. |
Calculates compound interest growth over time using the formula A = P(1 + r/n)^(nt). Given a principal, annual rate, duration in years, and compounding frequency, returns the future value, total interest earned, effective annual rate (APY), and a year-by-year growth schedule. Supports optional recurring monthly contributions for savings projections. Works for savings accounts, CDs, investment retu
| Parameter | Type | Required | Notes |
|---|---|---|---|
| principal | number | yes | Initial investment or deposit amount (any currency unit). |
| annual_rate_pct | number | yes | Annual interest rate as a percentage (e.g., 5.5 for 5.5%). |
| years | number | yes | Investment duration in years. Max 100. |
| compounds_per_year | integer | no | How often interest compounds per year. Allowed: 1 (annually), 2 (semi-annually), 4 (quarterly), 12 (monthly), 52 (weekly), 365 (daily). Defaults to 12. |
| monthly_contribution | number | no | Optional recurring monthly contribution added at each month. Defaults to 0. |
Calculates a test or exam grade from the number of correct answers and total questions. Returns the percentage score, letter grade, points missed, and GPA points. Supports US grading (A/B/C/D/F with 4.0 GPA scale), UK grading (First/2:1/2:2/Third/Fail), and percentage-only mode. US thresholds: A>=90, B>=80, C>=70, D>=60, F<60. UK thresholds: First>=70, 2:1>=60, 2:2>=50, Third>=40, Fail<40. Useful
| Parameter | Type | Required | Notes |
|---|---|---|---|
| correct | integer | yes | Number of questions answered correctly. Must be a non-negative integer. |
| total | integer | yes | Total number of questions on the test. Must be a positive integer. |
| grading_scale | string | no | Grading scale to use. 'us' for A-F letter grades, 'uk' for First/2:1/2:2/Third/Fail, 'percentage_only' for just the percentage. |
Calculates area and perimeter for common shapes — rectangle, circle, or triangle — in both imperial and metric units. Returns area in square feet, square meters, and acres, plus perimeter in feet and meters. For rectangles: area = length * width, perimeter = 2*(length + width). For circles: area = pi * r^2, perimeter = 2 * pi * r. For triangles: area = 0.5 * base * height, perimeter approximated a
No parameter schema on file.
Convert between units across 10 categories: length (m, km, mi, ft, in, yd, nmi), mass (kg, lb, oz, g, ton), volume (l, gal, ml, cup, fl_oz), area (m2, ft2, acre, hectare), speed (mps, kph, mph, knot), pressure (pa, psi, bar, atm, mmhg), energy (j, kwh, btu, cal, wh), data (b, kb, mb, gb, tb), time (s, ms, min, hr, day, year), and temperature (c, f, k). Accepts any value with source and target unit
| Parameter | Type | Required | Notes |
|---|---|---|---|
| value | number | yes | The numeric value to convert. |
| from | string | yes | Source unit abbreviation (e.g., 'km', 'lb', 'f', 'psi', 'kwh'). Case-insensitive. |
| to | string | yes | Target unit abbreviation (e.g., 'mi', 'kg', 'c', 'bar', 'btu'). Case-insensitive. |
Convert numbers between hexadecimal, binary, decimal, and octal bases. Accepts any base as input (prefix 0x for hex, 0b for binary, 0o for octal, or plain decimal) and returns all four representations simultaneously. Also reports bit width, byte count, ASCII character (if printable), and signed interpretations (8-bit, 16-bit, 32-bit two's complement). Essential for embedded programming, register d
| Parameter | Type | Required | Notes |
|---|---|---|---|
| value | string | yes | The number to convert. Prefix with 0x for hex (0xFF), 0b for binary (0b1010), 0o for octal (0o17). Plain numbers are treated as decimal. Supports negative values with leading minus. |
Convert between Unix timestamps and human-readable date/time formats. Accepts Unix epoch (in seconds or milliseconds), ISO 8601 strings, or 'now' for the current time. Returns both Unix seconds and milliseconds, ISO 8601 UTC string, date and time components, day of the week, relative time description ('2 hours ago'), and past/future indicator. Auto-detects whether a numeric input is seconds or mil
| Parameter | Type | Required | Notes |
|---|---|---|---|
| value | string | yes | A timestamp to convert. Accepts Unix epoch (seconds or milliseconds), ISO 8601 string (e.g. '2024-01-15T10:30:00Z'), or 'now' for the current time. |
Calculate Body Mass Index (BMI) from weight and height using the WHO standard formula. Supports metric (kg/cm) and imperial (lbs/inches) units. Returns the BMI value, WHO classification (Underweight, Normal, Overweight, Obese Class I-III), and the healthy weight range for the given height. Formula: BMI = weight_kg / (height_m)^2. Useful for health screening, fitness planning, and clinical intake f
| Parameter | Type | Required | Notes |
|---|---|---|---|
| weight | number | yes | Body weight. Units determined by the 'unit' parameter. |
| height | number | yes | Height. Units determined by the 'unit' parameter. |
| unit | string | no | Unit system. 'metric' = kg and cm. 'imperial' = lbs and inches. Defaults to 'metric'. |
Calculate tip and split a restaurant bill among multiple people. Given a bill amount, tip percentage, and number of diners, returns the tip amount, total with tip, per-person share, and effective tip percentage. Supports rounding up to the nearest whole number for convenience. Defaults to 18% tip for 1 person. Currency-agnostic — works with any monetary unit.
| Parameter | Type | Required | Notes |
|---|---|---|---|
| bill_amount | number | yes | Total bill amount before tip (any currency). |
| tip_pct | number | no | Tip percentage. Common values: 15 (standard), 18 (good), 20 (great), 25 (excellent). Defaults to 18%. |
| split | integer | no | Number of people splitting the bill. Defaults to 1 (no split). |
| round_up | boolean | no | Round the total up to the nearest whole number. Defaults to false. |
Calculate the difference between two dates in days, weeks, months, years, and business days. Accepts dates in YYYY-MM-DD format. Returns the absolute difference (order doesn't matter) plus a flag indicating whether the end date is in the future relative to start. Business days count only Monday through Friday. Useful for project planning, deadline tracking, contract duration calculations, and age
| Parameter | Type | Required | Notes |
|---|---|---|---|
| start_date | string | yes | Start date in YYYY-MM-DD format (e.g., '2024-01-15'). |
| end_date | string | yes | End date in YYYY-MM-DD format (e.g., '2024-12-31'). |
Free
$0 forever
- Every tool — any call limit is its publisher’s, not ours
- No card, and mcprush charges nothing for it
- Runs at its publisher’s own address — this marketplace is not in the path
- Nothing to cap, because mcprush bills nothing
What counts against your monthly calls
| Tool | Unit | Calls used | Out of the allowance |
|---|
Nothing here is billable: mcprush charges nothing to install calc.engineer or to call it, at any volume.
Call allowance · this installenforced at the gateway
Monthly allowance, in calls
—
—
Alert at 80% · then the tool returns a normal MCP error
Used this month: —
—Grade not published
No rule-by-rule report on file for this release
Two independent axes, because powerful and malicious are different questions. The grade is threat only. The capability level is blast radius, and it is never a penalty on the grade — it is priced as one subtract-only term in the score, where you can see it.
This listing is an address its publisher runs, and you connect to it directly — this marketplace is not in the path. The scanner reads packages and public source, and an address is neither. So there is no grade — not a withheld one, an unmeasured one.
Release history
This is an address its publisher runs: which release it serves is theirs to choose, so there is nothing here to pin. The history below is for reading; the current release on file is 1.0.0.
1.0.0
undated
latestNo release note was published with this version.
—
no reviews yet
Who can review
One review per account, from a signed-in account that does not publish this listing. Nothing else is asked — you can say what you think before you install it. Publishers can reply once per review, and a review can be edited or deleted by whoever wrote it.
Sign in to write one
Any signed-in account that does not publish calc.engineer can review it, once — before installing it or after. A review from an account that has installed it is marked as one.
No reviews yet
Nobody has reviewed this listing. The rating on the card is the mean of the reviews written here and nothing else, so there is no rating until somebody writes the first — which takes a signed-in account that does not publish it, and nothing else.