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kVA to amps calculator

Convert apparent power in kVA to line current for single-phase or balanced three-phase systems.

Enter the project values

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

Use line-to-line voltage for three-phase.
Your result will appear here.Calculate to see the outputs, formula and substituted working.

How the calculation works

Apparent-power relationship; power factor is not required.

Formula

I = S ÷ V (1Φ) or I = S ÷ (√3 × VLL) (3Φ)

Worked example

ArrangementBalanced three-phase
Apparent power100 kVA
Voltage400 V
Expected current144.34 A

Assumptions and limitations

Assumptions

  • The kVA value is total apparent power.
  • Three-phase output is balanced.

What this does not check

  • Does not convert kW without power factor.
  • Does not size generators, transformers, cables or switchgear.
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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