Watts to Amps conversion

Watts (W) to Amps (A) electric charge conversion calculator and how to convert.

Select current type, enter the power in watts, the voltage in volts, the power factor for the AC circuit and press the Calculate button:

W
V
W

DC Watts to Amps calculation

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

I(A) = P(W) / V(V)


AC Single Phase Watts to Amps calculation

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

I(A) = P(W) / (PF * V(V))

The power factor of resistive impededance load is equal to 1.


AC Three Phase Watts to Amps calculation

Calculation with line to line voltage

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

I(A) = P(W) / (√3 * PF * VL-L(V))

The power factor of resistive impedance load is equal to 1.

Calculation with line to neutral voltage

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

I(A) = P(W) / (3 * PF * VL-N(V))

The power factor of resistive impedance load is equal to 1.


Common power factor values

NOTE: It is NOT recommended to use common power factor values for accurate results.

Device Common power factor
Resistive load 1
Fluorescent 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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