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kW to amps calculator — single-phase

Convert electrical input power in kW to line current for a single-phase circuit using voltage and power factor.

Enter the project values

All values remain in your browser. Review the assumptions before using the result.

Use electrical input power, not mechanical output power.
Nominal voltage is editable.
Enter a value above 0 and no more than 1.
Your result will appear here.Calculate to see the outputs, formula and substituted working.

How the calculation works

Single-phase real-power relationship using user-entered voltage and power factor.

Formula

I = P ÷ (V × PF)

Worked example

Electrical input power10 kW
Voltage230 V
Power factor0.90
Expected current48.31 A

Assumptions and limitations

Assumptions

  • The entered kW is electrical input power.
  • The supply is steady-state single-phase.

What this does not check

  • Does not include motor efficiency, starting current or harmonics.
  • Does not select cables, protection or verify voltage drop.
Formula version: 1.0 · Last reviewed: 16 August 2026

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Engineering basis: first-principles electrical relationships using user-entered values. The page does not reproduce BS 7671 tables or establish compliance. Complete the project-specific design against the current BS 7671 information, manufacturer data and the applicable project requirements.
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