Free Electrical calculator

kW to amps calculator — three-phase

Convert electrical input power in kW to line current for a balanced three-phase load using line-to-line voltage and power factor.

Enter the project values

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

Your result will appear here.Calculate to see the outputs, formula and substituted working.

How the calculation works

Balanced three-phase real-power relationship using line-to-line voltage.

Formula

I = P ÷ (√3 × VLL × PF)

Worked example

Electrical input power10 kW

Voltage400 V

Power factor0.90

Expected current16.04 A

Assumptions and limitations

Assumptions

The load is balanced across three phases.
The entered kW is total three-phase electrical input power.

What this does not check

Does not assess unbalance, harmonics, starting current or diversity.
Does not establish cable, protective-device or compliance requirements.

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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