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
Waiting for calculation.
Apparent power
Waiting for calculation.
Real power
Waiting for calculation.
Sizing current
Waiting for calculation.
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

Dwelling Service Load Calculator

Residential service size by NEC 220.82: general load with demand plus larger HVAC. 5 inputs, 4 outputs with grouped results.

Outputs: General load (VA) · Service load (VA) · Service current

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.