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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bid_calculator

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

ratenumber, required

Burdened labor cost ($/h).

hoursnumber, required

Labor hours (h).

marginnumber, required

Target net margin (%).

overheadnumber, required

Overhead (% of direct cost) (%).

materialsnumber, required

Material cost ($).

directnumber

Permits and other job costs ($). Optional.

markupnumber

Material markup (%). Optional.

Argument	Type	Description
awg*	string	Largest conductor. "6" = 6 AWG; "8" = 8 AWG; "10" = 10 AWG; "12" = 12 AWG; "14" = 14 AWG; "16" = 16 AWG; "18" = 18 AWG.
clamps*	string	Internal cable clamps. "0" = None; "1" = One or more.
devices*	number	Devices (switches, receptacles).
grounds*	string	Equipment grounding conductors. "0" = None; "1" = One or more.
conductors*	number	Insulated conductors (not counting grounds).

Argument	Type	Description
awg*	string	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.
size*	string	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".
type*	string	Conduit type. "EMT" = EMT; "PVC-40" = PVC Schedule 40.
count*	number	Number of conductors.

Argument	Type	Description
ev	number	EV charger (VA). Optional.
hvac	number	Largest of heating or cooling (VA). Optional.
sqft*	number	Living area (ft²).
dryer	number	Dryer (VA). Optional.
other	number	Other fixed appliances (VA). Optional.
range	number	Range / cooktop (VA). Optional.
small*	number	Small-appliance circuits.
heater	number	Water heater (VA). Optional.
laundry*	string	Laundry circuit. "1" = Yes (1,500 VA); "0" = No.

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

Argument	Type	Description
i	number	Current (A). Optional.
p	number	Power (W). Optional.
r	number	Resistance (Ω). Optional.
v	number	Voltage (V). Optional.

Argument	Type	Description
rate*	number	Burdened labor cost ($/h).
hours*	number	Labor hours (h).
direct	number	Permits and other job costs ($). Optional.
margin*	number	Target net margin (%).
markup	number	Material markup (%). Optional.
overhead*	number	Overhead (% of direct cost) (%).
materials*	number	Material cost ($).

Argument	Type	Description
spaces*	string	Spaces. "12" = 12; "20" = 20; "24" = 24; "30" = 30; "42" = 42.
system*	string	Panel. "1" = 120/240 V single-phase; "3" = 208Y/120 V three-phase.
circuits*	string	Circuits: description, breaker A, poles, VA (one per line)

Argument	Type	Description
awg*	string	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.
amps*	number	Load current (A).
feet*	number	One-way distance (ft).
phase*	string	Phase. "1" = Single-phase; "3" = Three-phase.
volts*	string	Voltage. "120" = 120 V; "208" = 208 V; "240" = 240 V; "277" = 277 V; "480" = 480 V.
material*	string	Conductor. "cu" = Copper; "al" = Aluminum.

Argument	Type	Description
pf*	number	Power factor.
phase*	string	Phase. "1" = Single-phase; "3" = Three-phase.
volts*	string	Voltage. "120" = 120 V; "208" = 208 V; "240" = 240 V; "277" = 277 V; "480" = 480 V.
watts*	number	Power (W).

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

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bid_calculator

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bid_calculator

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