# Amps to Watts Calculator

Electric current in amps (A) to electric power in watts (W) calculator.

W
kW
mW

Watts to amps calculator ►

* Use e for scientific notation. E.g: 5e3, 4e-8, 1.45e12

## Ampere

Ampere (A) is a unit of electric current. Electric current is the rate of electric charge flow per time unit. One ampere (A) is equal to one coulomb (Q) per second (s).

## Watt

Watt (W) is a unit of power. Power is the rate of energy usage per time unit. One watt (W) is equal to one joule (J) per second (S).

### 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
Fluorescent lamp 0.95
Incandescent lamp 1
Resistive oven 1
Synchronous motor 0.9

## Amps to watts table (120V)

Current (A) Voltage (V) Power (W)
0.1 amps 120 volts 12 watts
0.2 amps 120 volts 24 watts
0.3 amps 120 volts 36 watts
0.4 amps 120 volts 48 watts
0.5 amps 120 volts 60 watts
0.6 amps 120 volts 72 watts
0.7 amps 120 volts 84 watts
0.8 amps 120 volts 96 watts
0.9 amps 120 volts 108 watts
1 amps 120 volts 120 watts
2 amps 120 volts 240 watts
3 amps 120 volts 360 watts
4 amps 120 volts 480 watts
5 amps 120 volts 600 watts
6 amps 120 volts 720 watts
7 amps 120 volts 840 watts
8 amps 120 volts 960 watts
9 amps 120 volts 1080 watts
10 amps 120 volts 1200 watts

Amps to watts calculation ►