# Amps to Watts Calculator

Electric current in amps (A) to electric power in watts (W) calculator.

Select current type, enter current in amps, voltage in volts, power factor for AC circuit and press the Calculate button (DC = Direct Current, AC = Alternating Current):

 Select current type: DC AC - Single phase AC - Three phase Enter current in amps: A Enter voltage in volts: V Power result in watts: W

* Use e for scientific notation. E.g: 5e3, 4e-8, 1.45e12

Watts to amps calculator ►

### DC amps to watts calculation

The power P in watts (W) is equal to the current I in amps (A), times the voltage V in volts (V):

P(W) = I(A) × V(V)

## AC single phase amps to watts calculation

The power P in watts (W) is equal to the power factor PF times the phase current I in amps (A), times the RMS voltage V in volts (V):

P(W) = PF × I(A) × V(V)

## AC three phase amps to watts calculation

#### Calculation with line to line voltage

The power P in watts (W) is equal to square root of 3 times the power factor PF times the phase current I in amps (A), times the line to line RMS voltage VL-L in volts (V):

P(W) = 3 × PF × I(A) × VL-L(V)

#### Calculation with line to neutral voltage

The power P in watts (W) is equal to 3 times the power factor PF times the phase current I in amps (A), times the line to neutral RMS voltage VL-N in volts (V):

P(W) = 3 × PF × I(A) × VL-N(V)

## Typical power factor values

Do not use typical power factor values for accurate calculations.

Device Typical power factor
Fluorescent lamp 0.95
Incandescent lamp 1
Resistive oven 1
Synchronous motor 0.9

Amps to watts calculation ►