Amps to Watts Electrical Conversion Calculator
Enter the current and voltage to convert amps to watts for DC and AC single and three-phase circuits.
Try our watts to amps calculator.
How to Convert Amps to Watts
Converting amps to watts 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.
Using a little algebra it’s possible express the amps to watts formula as:
P(W) = I(A) × V(V)
Thus, the power P in watts is equal to the current I in amps multiplied by the voltage V in volts.
For example, find the wattage of 8 amps at 120 volts
power = current × voltage
power = 8A × 120V
power = 960W
Single-Phase AC Circuit Amps to Watts Conversion
Converting amps to watts for a single-phase AC circuit with power factor requires a slight variation of the formula.
P(W) = I(A) × V(V) × PF
The power P in watts is equal to the current I in amps multiplied by the voltage V in volts multiplied by the power factor PF. We suggest using a power factor calculator to find the PF value.
Three-Phase AC Circuit Amps to Watts Conversion
Using Line to Line Voltage
For three-phase AC circuits where the line to line voltage is known, the formula to convert amps to watts is:
P(W) = I(A) × V(V) × PF × √3
The power P in watts is equal to the current I in amps multiplied by the voltage V in volts multiplied by the power factor PF multiplied by the square root of 3.
Using Line to Neutral Voltage
For three-phase AC circuits where the line to neutral voltage is known, the formula to convert amps to watts is:
P(W) = I(A) × V(V) × PF × 3
The power P in watts is equal to the current I in amps multiplied by the voltage V in volts multiplied by the power factor PF multiplied by 3.
How to Convert Amps and Ohms to Watts
You can also convert amps to watts using circuit resistance with this formula:
P(W) = I(A)2 × R(Ω)
The power P in watts is equal to the current I in amps squared multiplied by the resistance R in ohms.
Since 1 kilowatt is equal to 1,000 watts, it is possible to use the formulas above to also convert amps to kW, but the result will need to be divided by 1,000. You can also use our amps to kW calculator to solve for kilowatts.
Equivalent Amps and Watts at 120V AC
| Current | Power | Voltage |
|---|---|---|
| 1 Amps | 120 Watts | 120 Volts |
| 2 Amps | 240 Watts | 120 Volts |
| 3 Amps | 360 Watts | 120 Volts |
| 4 Amps | 480 Watts | 120 Volts |
| 5 Amps | 600 Watts | 120 Volts |
| 6 Amps | 720 Watts | 120 Volts |
| 7 Amps | 840 Watts | 120 Volts |
| 8 Amps | 960 Watts | 120 Volts |
| 9 Amps | 1,080 Watts | 120 Volts |
| 10 Amps | 1,200 Watts | 120 Volts |
| 11 Amps | 1,320 Watts | 120 Volts |
| 12 Amps | 1,440 Watts | 120 Volts |
| 13 Amps | 1,560 Watts | 120 Volts |
| 14 Amps | 1,680 Watts | 120 Volts |
| 15 Amps | 1,800 Watts | 120 Volts |
| 20 Amps | 2,400 Watts | 120 Volts |
| 25 Amps | 3,000 Watts | 120 Volts |
| 30 Amps | 3,600 Watts | 120 Volts |
| 35 Amps | 4,200 Watts | 120 Volts |
| 40 Amps | 4,800 Watts | 120 Volts |
| 45 Amps | 5,400 Watts | 120 Volts |
| 50 Amps | 6,000 Watts | 120 Volts |
| 60 Amps | 7,200 Watts | 120 Volts |
| 70 Amps | 8,400 Watts | 120 Volts |
| 80 Amps | 9,600 Watts | 120 Volts |
| 90 Amps | 10,800 Watts | 120 Volts |
| 100 Amps | 12,000 Watts | 120 Volts |
Equivalent Amps and Watts at 12V AC
| Current | Power | Voltage |
|---|---|---|
| 1 Amps | 12 Watts | 12 Volts |
| 2 Amps | 24 Watts | 12 Volts |
| 3 Amps | 36 Watts | 12 Volts |
| 4 Amps | 48 Watts | 12 Volts |
| 5 Amps | 60 Watts | 12 Volts |
| 6 Amps | 72 Watts | 12 Volts |
| 7 Amps | 84 Watts | 12 Volts |
| 8 Amps | 96 Watts | 12 Volts |
| 9 Amps | 108 Watts | 12 Volts |
| 10 Amps | 120 Watts | 12 Volts |
| 11 Amps | 132 Watts | 12 Volts |
| 12 Amps | 144 Watts | 12 Volts |
| 13 Amps | 156 Watts | 12 Volts |
| 14 Amps | 168 Watts | 12 Volts |
| 15 Amps | 180 Watts | 12 Volts |
| 20 Amps | 240 Watts | 12 Volts |
| 25 Amps | 300 Watts | 12 Volts |
| 30 Amps | 360 Watts | 12 Volts |
| 35 Amps | 420 Watts | 12 Volts |
| 40 Amps | 480 Watts | 12 Volts |
| 45 Amps | 540 Watts | 12 Volts |
| 50 Amps | 600 Watts | 12 Volts |
| 60 Amps | 720 Watts | 12 Volts |
| 70 Amps | 840 Watts | 12 Volts |
| 80 Amps | 960 Watts | 12 Volts |
| 90 Amps | 1,080 Watts | 12 Volts |
| 100 Amps | 1,200 Watts | 12 Volts |
