Amps to Watts
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 |
|---|---|
| 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 |
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 |
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