# How to convert watts to amps

How to convert electric power in watts (W) to electric current in amps (A).

You can calculate amps from watts and volts. You can't convert watts to amps since watts and amps units do not measure the same quantity.

### DC watts to amps calculation formula

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)}

So amps are equal to watts divided by volts.

amp = watt / volt

or

A = W / V

#### Example

What is the current in amps when the power consumption is 330 watts and the voltage supply is 110 volts?

*I* = 330W / 110V = 3A

### AC single phase watts to amps calculation formula

The phase current *I* in amps (A) is equal to the real 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)}* *
)

So amps are equal to watts divided by power factor times volts.

amps = watts / (*PF* × volts)

or

A = W / (*PF* × V)

#### Example

What is the phase current in amps when the power consumption is 330 watts, the power factor is 0.8 and the RMS voltage supply is 110 volts?

*I* = 330W / (0.8 × 110V) = 3.75A

### AC three phase watts to amps calculation formula

#### Amps calculation with line to line voltage

The phase current *I* in amps (A) is equal to the real 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)}* *)

So amps are equal to watts divided by square root of 3 times power factor times volts.

amps = watts / (*√*3
× * PF* × volts)

or

A = W / (*√*3
× * PF* × V)

##### Example

What is the phase current in amps when the power consumption is 330 watts, the power factor is 0.8 and the RMS voltage supply is 110 volts?

*I* = 330W / (*√*3
× 0.8 × 110V) = 2.165A

#### Amps calculation with line to neutral voltage

The calculation assumes the loads are balanced.

The phase current *I* in amps (A) is equal to the real power *P* in
watts (W), divided by 3 times the
power factor *PF
*times the line to neutral RMS voltage *V*_{L-0} in volts
(V):

* I*_{(A)} = * P*_{(W)} / (3
× * PF* × * V*_{L-0(V)}* *)

So amps are equal to watts divided by 3 times power factor times volts.

amps = watts / (3
× * PF* × volts)

or

A = W / (3
× * PF* × V)

How to convert amps to watts ►

## See also

- Watts to amps calculator
- How to convert amps to watts
- How to convert amps to kilowatts
- How to convert kilowatts to amps
- How to convert 1 watt to amps
- How to convert 100 watts to amps
- How to convert 500 watts to amps
- How to convert 600 watts to amps
- How to convert 800 watts to amps
- How to convert 1000 watts to amps
- How to convert 1200 watts to amps
- How to convert 2000 watts to amps
- Power factor
- Amp
- Volt
- Watt
- Electrical calculation
- Power conversion