# Online Watts to amp calculator

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# Watts to amps calculator

Converting watts to amps can be done using the power formula, which states that I = P ÷ E, where P is power measured in watts, I is current measured in amps, and E is voltage measured in volts.

## 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 the
power factor *PF* times the RMS voltage *V* in volts (V):

* I*_{(A)} = * P*_{(W)} / (*PF* × * V*_{(V)})

The power factor of resistive impedance 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 square root of 3 times the
power factor *PF* times the line to line RMS voltage *V*_{L-L} in volts (V):

* I*_{(A)} = * P*_{(W)} / (*√*3
× * PF* × * V*_{L-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 the line to neutral RMS voltage *V*_{L-N} in volts (V):

* I*_{(A)} = * P*_{(W)} / (3
× * PF* × * V*_{L-N(V)}* *)