## How to convert amps to watts

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

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

## DC amps to watts calculation formula

The power

Pin watts (W) is equal to the currentIin amps (A), times the voltageVin volts (V):

P_{(W)}=I_{(A)}×V_{(V)}So watts are equal to amps times volts:

watt = amp × volt

or

W = A × V

## Example

What is power consumption in watts when the current is 3A and the voltage supply is 110V?

Answer: the power P is equal to current of 3 amps times the voltage of 110 volts.

P= 3A × 110V = 330W## AC single phase amps to watts calculation formula

The real power

Pin watts (W) is equal to the power factorPFtimes the phase currentIin amps (A), times the RMS voltageVin volts (V):

P_{(W)}=PF×I_{(A)}×V_{(V)}So watts are equal to power factor times amps times volts:

watt =

PF×amp × voltor

W =

PF×A × V## Example

What is power consumption in watts when the power factor is 0.8 and the phase current is 3A and the RMS voltage supply is 110V?

Answer: the power P is equal to power factor of 0.8 times current of 3 amps times voltage of 110 volts.

P= 0.8 × 3A × 110V = 264W## AC three phase amps to watts calculation formula

## Watts calculation with line to line voltage

The real power

Pin watts (W) is equal to square root of 3 times the power factorPFtimes the phase currentIin amps (A), times the line to line RMS voltageV_{L-L}in volts (V):

P_{(W)}=√3 ×PF×I_{(A)}×V_{L-L(V)}So watts are equal to square root of 3 times power factor PF times amps times volts:

watt =

√3 ×PF×amp × voltor

W =

√3 ×PF×A × V## Example

What is power consumption in watts when the power factor is 0.8 and the phase current is 3A and the RMS voltage supply is 110V?

Answer: the power P is equal to power factor of 0.8 times current of 3 amps times the voltage of 110 volts.

P=√3 × 0.8 × 3A × 110V = 457W## Watts calculation with line to neutral voltage

The calculation assumes the loads are balanced.

The real power

Pin watts (W) is equal to 3 times the power factorPFtimes the phase currentIin amps (A), times the line to neutral RMS voltageV_{L-0}in volts (V):

P_{(W)}= 3 ×PF×I_{(A)}×V_{L-0(V)}So watts are equal to 3 times power factor PF times amps times volts:

watt = 3 ×

PF×amp × voltor

W = 3 ×

PF×A × V

How to convert watts to amps ►

## See also

- Amps to watts calculator
- How to convert watts to amps
- How to convert kilowatts to amps
- How to convert amps to kilowatts
- 1 amps to watts calculation
- 2 amps to watt calculation
- 3 amps to watt calculation
- 10 amps to watt calculation
- 15 amps to watt calculation
- 100 amps to watt calculation
- Power factor
- Amp
- Volt
- Watt
- Electrical calculation
- Power conversion