Skip to content
PanelCalc
Browse: Calculators, Guides, About

Single-Phase Power Calculator

Volts, amps, watts, VA and continuous-load headroom for single-phase branch circuits. 5 inputs, 4 outputs with grouped results.

Inputs

Circuit

Nominal volts: 120, 208, 240, 277.

Continuous load (3h+)?

Continuous loads size at 125%.

Load

Load current, measured or nameplate.

1.0 resistive; 0.7-0.9 motors and drivers.

Hours per day for the energy estimate.

Result

Energy per day
7.20 kWh
Apparent power
1,440 VA
Real power
1,440 W
Sizing current
15.0 A
Screening calculation only. Verify against NEC articles cited on the page and the equipment nameplate; the authority having jurisdiction governs.

Related calculators

Calculator

Control Transformer VA Sizer

Control power transformer VA per NEC 450: inrush plus sealed burden stepped to a standard CPT size. 5 inputs, 4 outputs with grouped results.

Outputs: Required VA · Standard CPT size · Primary current

Open calculator

Calculator

Harmonic Neutral Sizer

Neutral ampacity for nonlinear loads with the 200% neutral call. 3 inputs, 3 outputs with grouped results.

Outputs: Calculated neutral current · Required neutral ampacity · Use 200% neutral (1=yes)

Open calculator

Calculator

kW kVA Power Factor Converter

Convert kW, kVA, PF both ways; capacitor kVAR to reach target PF; annual demand-cost of low PF. 4 inputs, 5 outputs with grouped results.

Outputs: Real power · Reactive power · Capacitor to target PF

Open calculator

Calculator

Panel Load Summary

Sum up to five load groups with demand factor into feeder amps, kVA and standard main size. 9 inputs, 6 outputs with grouped results.

Outputs: Connected load · Demand load · Demand kVA

Open calculator

Workspace

Keep the assumptions with the result.

Save this calculation to return to the inputs, result, and report from your private workspace.

Sign in or create an account to save this calculation.