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Power & Electrical

Three Phase Current Calculator

Estimate three-phase line current from kW, voltage and power factor.

Estimator only. Confirm supply, phases, load type, starting current and design requirements.

Notes and next steps

How it works

Estimate three-phase line current from kW, line voltage and power factor.

Formula used: Current = kW × 1000 ÷ (√3 × voltage × power factor).

Worked example

10 kW at 400 V and 0.9 PF is about 16 A.

Common mistakes
  • Using phase voltage instead of line voltage.
  • Ignoring power factor.
  • Assuming balanced loads without checking.
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