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Three-Phase Power Calculator (kW ↔ Amps)

How many amps does a three-phase (or single-phase) load draw — or how many kW is a given current?

Single calculationv1.0.0Verified 2026-11-01Runs in your browser

Spec sheet

ac_power · v1.0.0

Method

AC real/apparent power

013-phase: P = √3 · V_LL · I · PF
021-phase: P = V · I · PF
03S = P / PF

Limits — read before relying on it

Balanced loads; motor efficiency is not included (divide shaft kW by efficiency first).

Sources

AC power in balanced three-phase systemstextbook

Worked example

computed by the same formula

10 kW, 400 V, PF 0.85

Inputs

Convert: kW → amps
Power (kW) or current (A): 10
System: Three-phase
Voltage (line-to-line for 3-phase): 400 V
Power factor: 0.85

Result

Result: 16.981
Unit: A
Apparent power: 11.765 kVA

Questions

How is the three-phase power calculator calculated?

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AC real/apparent power. 3-phase: P = √3 · V_LL · I · PF · 1-phase: P = V · I · PF · S = P / PF

Example: 10 kW, 400 V, PF 0.85?

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Result: 16.981; unit: A.

What does this calculator not cover?

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Balanced loads; motor efficiency is not included (divide shaft kW by efficiency first).

Where do the numbers come from?

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Sources: AC power in balanced three-phase systems. The formula is versioned (ac_power v1.0.0) and covered by automated tests.

Is my data stored?

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No. The calculation runs in your browser and nothing is sent unless you choose to save a shareable link.

Also searched asthree phase power calculator · kw to amps · amps to kw · 3 phase current calculation · kva calculator

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Ohm's Law Calculator (Voltage, Current, Resistance, Power)

Given any two of voltage, current, resistance and power, what are the other two?

V = I·R, P = V·I