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Three-Phase Current Calculator

Estimate balanced three-phase line current from active power, line voltage, power factor and efficiency.

✓ Method reviewed · 2026-08-22
CALCULATORHow much current does a three-phase load draw?

Results are for information and preliminary estimation. For critical technical work, manufacturer data, local codes and qualified professional review take precedence.

CALCULATION ENGINETHREE-PHASE-CURRENT · R1.5.1Engine and route QA: PASS · Method and limits visible
Trust & methodology →
1Enter real inputs
2Press Calculate
3Read result with assumptions
Method & assumptions

How is it calculated?

For balanced three phase, I ≈ P / (√3 × V × PF × η). Motor starting current, harmonics and manufacturer data still matter in real installations.

Example

An 11 kW load at 400 V, PF 0.85 and 90% efficiency draws roughly 20.8 A.

What questions does this tool answer?

  • How much current does a three-phase load draw?
  • How is Three-Phase Current calculated?
  • What inputs are needed for Three-Phase Current?
WHAT CHANGES THE RESULT

Check these before using the estimate

Electrical and energy calculations are not final designs by themselves. Load profile, conductor conditions, protection, efficiency and local codes must be considered together. Sorsana tools are intended for preliminary sizing and scenario comparison.

  • Continuous and surge characteristics of the real load
  • Cable length, conductor material and ambient temperature
  • Battery, charger and inverter efficiency plus usable capacity
  • Manufacturer data and applicable local electrical codes
FAQ

Frequently asked questions

Is 400 V line-to-line?+

Yes. This tool uses line-to-line voltage.

Does this include motor starting current?+

No. It estimates running current; starting and protection design must be checked separately.