Electrical calculator

Watts to Amps Calculator

Convert real power in watts to current in amps for DC, single-phase, and three-phase systems.

DC / single-phase Amps = Watts ÷ Volts

Three-phase Amps = Watts ÷ (√3 × Volts × PF)

i For AC systems, power factor (PF) improves accuracy when converting real power to current.

Instant result

Result

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Enter values to calculate.

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Formula—

How to use

Follow these steps for a clear answer.

Type the real power in watts for the load or circuit.

Use the supply voltage. For three phase, use line-to-line voltage.

Select DC/single-phase or three-phase, then calculate amps.

Common configurations with formula and result.

1500 W at 120 V

1500 ÷ 120

12.5 A

10000 W at 400 V, PF 0.9

10000 ÷ (√3 × 400 × 0.9)

16.04 A

60 W at 12 V

60 ÷ 12

5 A

Power	Voltage	System	Result
60 W	12 V	DC	5 A
1500 W	120 V	Single phase	12.5 A
2300 W	230 V	Single phase	10 A
10000 W	400 V, PF 0.9	Three phase	16.04 A

i Three-phase results assume a balanced load.

Key distinctions behind the calculation.

How do watts relate to amps?

Watts measure real power. Amps measure current. Dividing watts by volts gives amps for DC and unity-PF single-phase AC.

Why is power factor needed?

On AC systems, real power is VA × power factor. Including PF gives a more accurate current estimate.

Is three-phase different?

Yes. Balanced three-phase current uses √3 and usually includes power factor: I = P ÷ (√3 × V × PF).