Three-phase current calculator
Convert a balanced three-phase electrical load from kW to line current and apparent power, with the calculation shown.
Educational reference only. Examples and calculator results are not approved installation designs, equipment selections or operating instructions.
Your inputs
Results update as you edit. Use a decimal point. Default values are hypothetical, not recommended equipment sizes.
Electrical input or load power, not motor shaft output.
Voltage between phases, not phase-to-neutral voltage.
Enter a positive power factor up to 1, for example 0.9.
Illustrative result
- RMS line current
- 481.125 A
- Apparent power
- 333.333 kVA
Worked steps
- S = 300 / 0.9 = 333.333 kVA
- I = (300 × 1,000) / (√3 × 400 × 0.9) = 481.125 A
Calculations use unrounded values; displayed steps are rounded to three decimal places or five significant digits for extreme values.
Formula and units
S (kVA) = P (kW) / PF; I (A) = P × 1,000 / (√3 × VLL × PF)
Change one input to see its effect. Inputs are calculated in your browser and are not submitted to a calculation service.