SparkQuote NEC calculators

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NEC 2023 electrical calculators: wire size, ampacity, voltage drop, conduit fill, box fill, load.

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Status: Healthy
Last Tested: 2026-10-14 21:46
Transport: Streamable HTTP · MCP 2025-11-25
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TDQS

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Available Tools

10 tools

bid_calculatorElectrical bid calculator

Read-onlyIdempotent

Inspect

Electrical bid price from materials, markup, labor hours and rate, job costs, overhead and a target net margin (price = break-even / (1 − margin)).

ParametersJSON Schema

Name	Required	Description
`rate`	Yes	Burdened labor cost ($/h).
`hours`	Yes	Labor hours (h).
`direct`	No	Permits and other job costs ($). Optional.
`margin`	Yes	Target net margin (%).
`markup`	No	Material markup (%). Optional.
`overhead`	Yes	Overhead (% of direct cost) (%).
`materials`	Yes	Material cost ($).

Output Schema

ParametersJSON Schema

Name	Required	Description
`ok`	Yes
`url`	Yes
`code`	Yes
`rows`	Yes
`table`	No
`inputs`	Yes
`summary`	Yes

box_fillBox fill calculator

Read-onlyIdempotent

Inspect

Minimum outlet box volume from NEC 314.16(B): conductor, device (2 each), clamp and grounding allowances times the Table 314.16(B) volume for the largest conductor.

ParametersJSON Schema

Name	Required	Description	Default
`awg`	Yes	Largest conductor. "6" = 6 AWG; "8" = 8 AWG; "10" = 10 AWG; "12" = 12 AWG; "14" = 14 AWG; "16" = 16 AWG; "18" = 18 AWG.	12
`clamps`	Yes	Internal cable clamps. "0" = None; "1" = One or more.	1
`devices`	Yes	Devices (switches, receptacles).
`grounds`	Yes	Equipment grounding conductors. "0" = None; "1" = One or more.	1
`conductors`	Yes	Insulated conductors (not counting grounds).

Output Schema

ParametersJSON Schema

Name	Required	Description
`ok`	Yes
`url`	Yes
`code`	Yes
`rows`	Yes
`table`	No
`inputs`	Yes
`summary`	Yes

conduit_fillConduit fill calculator

Read-onlyIdempotent

Inspect

Percent fill and maximum number of THHN/THWN-2 conductors of one size in EMT or PVC Schedule 40, from NEC Chapter 9 Tables 1, 4 and 5.

ParametersJSON Schema

Name	Required	Description	Default
`awg`	Yes	THHN/THWN-2 size. "1" = 1 AWG; "2" = 2 AWG; "3" = 3 AWG; "4" = 4 AWG; "6" = 6 AWG; "8" = 8 AWG; "10" = 10 AWG; "12" = 12 AWG; "14" = 14 AWG; "1/0" = 1/0 AWG; "2/0" = 2/0 AWG; "3/0" = 3/0 AWG; "4/0" = 4/0 AWG.	12
`size`	Yes	Trade size. "1" = 1"; "2" = 2"; "3" = 3"; "4" = 4"; "1/2" = 1/2"; "3/4" = 3/4"; "1-1/4" = 1-1/4"; "1-1/2" = 1-1/2"; "2-1/2" = 2-1/2"; "3-1/2" = 3-1/2".	3/4
`type`	Yes	Conduit type. "EMT" = EMT; "PVC-40" = PVC Schedule 40.	EMT
`count`	Yes	Number of conductors.

Output Schema

ParametersJSON Schema

Name	Required	Description
`ok`	Yes
`url`	Yes
`code`	Yes
`rows`	Yes
`table`	No
`inputs`	Yes
`summary`	Yes

load_calculatorResidential load calculator (NEC 220.82)

Read-onlyIdempotent

Inspect

Dwelling service load by the NEC 220.82 optional method: 3 VA/ft² lighting, small-appliance and laundry circuits, fixed appliances, demand factor, heating or cooling, and the minimum standard service size. Leave an appliance out to count it as 0 VA.

ParametersJSON Schema

Name	Required	Description	Default
`ev`	No	EV charger (VA). Optional.
`hvac`	No	Largest of heating or cooling (VA). Optional.
`sqft`	Yes	Living area (ft²).
`dryer`	No	Dryer (VA). Optional.
`other`	No	Other fixed appliances (VA). Optional.
`range`	No	Range / cooktop (VA). Optional.
`small`	Yes	Small-appliance circuits.
`heater`	No	Water heater (VA). Optional.
`laundry`	Yes	Laundry circuit. "1" = Yes (1,500 VA); "0" = No.	1
`disposal`	No	Disposal (VA). Optional.
`dishwasher`	No	Dishwasher (VA). Optional.

Output Schema

ParametersJSON Schema

Name	Required	Description
`ok`	Yes
`url`	Yes
`code`	Yes
`rows`	Yes
`table`	No
`inputs`	Yes
`summary`	Yes

nec_ampacityNEC Table 310.16 ampacity lookup

Read-onlyIdempotent

Inspect

Allowable ampacity of one insulated conductor from NEC Table 310.16 (not more than three current-carrying conductors in a raceway or cable, 30°C ambient), before any adjustment or correction factors and before the 240.4(D) small-conductor limits.

ParametersJSON Schema

Name	Required	Description
`size`	Yes	Conductor size: AWG ("14" … "4/0") or kcmil ("250" … "500").
`temp`	Yes	Temperature column in °C: 60 (NM-B, UF), 75 (THWN, most terminations), 90 (THHN, for derating).
`material`	Yes	"cu" = copper; "al" = aluminum.

Output Schema

ParametersJSON Schema

Name	Required	Description
`ok`	Yes
`url`	Yes
`code`	Yes
`rows`	Yes
`table`	No
`inputs`	Yes
`summary`	Yes

ohms_lawOhm's law calculator

Read-onlyIdempotent

Inspect

Ohm's law and power: give exactly two of voltage, current, resistance and power; the other two are calculated.

ParametersJSON Schema

Name	Required	Description
`i`	No	Current (A). Optional.
`p`	No	Power (W). Optional.
`r`	No	Resistance (Ω). Optional.
`v`	No	Voltage (V). Optional.

Output Schema

ParametersJSON Schema

Name	Required	Description
`ok`	Yes
`url`	Yes
`code`	Yes
`rows`	Yes
`table`	No
`inputs`	Yes
`summary`	Yes

panel_schedulePanel schedule generator

Read-onlyIdempotent

Inspect

Lays circuits out on a 120/240 V single-phase or 208Y/120 V three-phase panel and totals the load per phase with the imbalance.

ParametersJSON Schema

Name	Required	Description	Default
`spaces`	Yes	Spaces. "12" = 12; "20" = 20; "24" = 24; "30" = 30; "42" = 42.	30
`system`	Yes	Panel. "1" = 120/240 V single-phase; "3" = 208Y/120 V three-phase.	1
`circuits`	Yes	Circuits: description, breaker A, poles, VA (one per line)	Kitchen receptacles, 20, 1, 1500 Kitchen receptacles, 20, 1, 1500 Microwave, 20, 1, 1500 Dishwasher, 15, 1, 1200 Range, 50, 2, 12000 Dryer, 30, 2, 5000 Water heater, 30, 2, 4500 Lighting, 15, 1, 1200

Output Schema

ParametersJSON Schema

Name	Required	Description
`ok`	Yes
`url`	Yes
`code`	Yes
`rows`	Yes
`table`	No
`inputs`	Yes
`summary`	Yes

voltage_dropVoltage drop calculator

Read-onlyIdempotent

Inspect

Voltage drop for a given conductor size, current and one-way length, single- or three-phase, from NEC Chapter 9 Table 8 circular mils (VD = 2·K·I·L / CM, or √3 for three-phase).

ParametersJSON Schema

Name	Required	Description	Default
`awg`	Yes	Size. "14" = 14 AWG; "12" = 12 AWG; "10" = 10 AWG; "8" = 8 AWG; "6" = 6 AWG; "4" = 4 AWG; "3" = 3 AWG; "2" = 2 AWG; "1" = 1 AWG; "1/0" = 1/0 AWG; "2/0" = 2/0 AWG; "3/0" = 3/0 AWG; "4/0" = 4/0 AWG; "250" = 250 kcmil; "300" = 300 kcmil; "350" = 350 kcmil; "400" = 400 kcmil; "500" = 500 kcmil.	6
`amps`	Yes	Load current (A).
`feet`	Yes	One-way distance (ft).
`phase`	Yes	Phase. "1" = Single-phase; "3" = Three-phase.	1
`volts`	Yes	Voltage. "120" = 120 V; "208" = 208 V; "240" = 240 V; "277" = 277 V; "480" = 480 V.	240
`material`	Yes	Conductor. "cu" = Copper; "al" = Aluminum.	cu

Output Schema

ParametersJSON Schema

Name	Required	Description
`ok`	Yes
`url`	Yes
`code`	Yes
`rows`	Yes
`table`	No
`inputs`	Yes
`summary`	Yes

watts_to_ampsWatts to amps calculator

Read-onlyIdempotent

Inspect

Current drawn by a load in watts at a voltage and power factor, single- or three-phase, plus the 125% continuous-load value.

ParametersJSON Schema

Name	Required	Description	Default
`pf`	Yes	Power factor.
`phase`	Yes	Phase. "1" = Single-phase; "3" = Three-phase.	1
`volts`	Yes	Voltage. "120" = 120 V; "208" = 208 V; "240" = 240 V; "277" = 277 V; "480" = 480 V.	240
`watts`	Yes	Power (W).

Output Schema

ParametersJSON Schema

Name	Required	Description
`ok`	Yes
`url`	Yes
`code`	Yes
`rows`	Yes
`table`	No
`inputs`	Yes
`summary`	Yes

wire_sizeWire size calculator

Read-onlyIdempotent

Inspect

Minimum conductor size for a circuit: NEC Table 310.16 ampacity at the termination temperature rating, the 240.4(D) small-conductor limits, voltage drop over the run, and the Table 250.122 equipment grounding conductor, increased in proportion under 250.122(B) when voltage drop upsizes the conductors.

ParametersJSON Schema

Name	Required	Description	Default
`amps`	Yes	Breaker / load (A).
`feet`	Yes	One-way distance (ft).
`temp`	Yes	Termination rating. "60" = 60°C (NM-B, UF); "75" = 75°C (THHN in conduit); "90" = 90°C.	75
`limit`	Yes	Max voltage drop (%).
`phase`	Yes	Phase. "1" = Single-phase; "3" = Three-phase.	1
`volts`	Yes	Voltage. "120" = 120 V; "208" = 208 V; "240" = 240 V; "277" = 277 V; "480" = 480 V.	240
`material`	Yes	Conductor. "cu" = Copper; "al" = Aluminum.	cu

Output Schema

ParametersJSON Schema

Name	Required	Description
`ok`	Yes
`url`	Yes
`code`	Yes
`rows`	Yes
`table`	No
`inputs`	Yes
`summary`	Yes

Tool Schema Changelog

Recent tool additions, removals, and schema changes observed during successful MCP inspections.

10 tool updatesOct 14, 2026
- First observedbid_calculator
- First observedbox_fill
- First observedconduit_fill
- First observedload_calculator
- First observednec_ampacity
- First observedohms_law
- First observedpanel_schedule
- First observedvoltage_drop
- First observedwatts_to_amps
- First observedwire_size

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