HTHOMETALLYTHE PRACTICAL HOME GUIDE

Electrical power/ CALCULATOR

Single-phase AC load current

Convert real input power, voltage and power factor into apparent power and approximate steady current.

Use measured input power or the relevant manufacturer input rating—not useful heat or mechanical output.
Use the voltage expected at the load during operation.
Use documented or measured power factor. Enter 100% only for a near-resistive load.
A transparent scenario allowance, not a universal breaker-sizing rule.
Approximate apparent power

2,316 VA

Estimated steady current

10.07 A

Current including allowance

12.59 A

Single-phase sinusoidal AC, steady RMS voltage, stated real input power and power factor, and one load. Starting current, harmonics, waveform, duty cycle, efficiency, voltage variation, conductor ampacity, breaker characteristics and local rules are excluded. Do not select a cable or protective device from this result alone.

FROM ESTIMATE TO ACTION

Use the result, not just the number.

01

Verify the inputs

Measure or document each input. If a value is only an estimate, record its source and test a conservative alternative.

02

Keep the calculation traceable

Save the input link or copied result together with the date, units and assumptions. A number without its inputs cannot be checked later.

03

Confirm the decision

Compare the estimate with the related guide, current product data and requirements that apply at your location before buying or building.

Inputs to verify

Real input power (W)
Use measured input power or the relevant manufacturer input rating—not useful heat or mechanical output.
Operating voltage (V)
Use the voltage expected at the load during operation.
Power factor (%)
Use documented or measured power factor. Enter 100% only for a near-resistive load.
Planning allowance (% of estimated current)
A transparent scenario allowance, not a universal breaker-sizing rule.

Continue your calculation

Electrical power

Single-phase copper voltage-drop screen

Estimate the resistive part of voltage drop and cable heat for a two-conductor single-phase run.