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):
* Use e for scientific notation. E.g: 5e3, 4e-8, 1.45e12
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 |
|---|---|
| Resistive load | 1 |
| Fluorecent lamp | 0.95 |
| Incandescent lamp | 1 |
| Induction motor full load | 0.85 |
| Induction motor no load | 0.35 |
| Resistive oven | 1 |
| Synchronous motor | 0.9 |
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