Volts to Watts Electrical Conversion Calculator
Convert volts to watts by entering the voltage and current in amps, or the resistance of the circuit in the form below.
Convert Volts and Amps to Watts
Convert Volts and Ohms to Watts
How to Convert Volts to Watts
Converting voltage to power measured in watts is easy using a simple Watt’s Law formula. Watt’s Law states that current is equal to power divided by voltage. Using a little algebra we can change this formula a bit to also state that power is equal to voltage times current.
This is the formula to convert voltage to wattage:
Power(W) = Voltage(V) × Current(A)
Thus, to solve for wattage, simply multiply the voltage by the current in amps.
For example, let’s convert 12 volts to watts, for a DC circuit with 2 amps of current.
Power(W) = 12 V × 2 A
Power(W) = 24 watts
Conversion For AC Circuits
Converting voltage to wattage in AC electrical circuits uses the same formula with some slight modifications. In AC circuits, power in watts is equal to the RMS voltage times the current in amps times the power factor.
Power(W) = Voltage(V) × Current(A) × PF
For example, let’s convert 120 volts to watts, for an AC electrical circuit with 15 amps of current and a power factor of .9.
Power(W) = 120 V × 15 A × .9
Power(W) = 1,620 watts
Convert Volts to Watts using Resistance
It’s also possible to convert volts to watts if you know the resistance of the circuit. Wattage is equal to voltage times the voltage divided by the resistance in ohms.
Power(W) = Voltage(V)2 ÷ Resistance(Ω)
For example, let’s convert 24 volts to watts, for a DC circuit with 12 ohms of resistance.
Power(W) = (24 V)2 ÷ 12 Ω
Power(W) = 576 ÷ 12
Power(W) = 48 watts
Equivalent Volts and Watts Measurements
| Voltage | Power | Current |
|---|---|---|
| 1 Volts | 1 Watts | 1 Amps |
| 1 Volts | 2 Watts | 2 Amps |
| 1 Volts | 3 Watts | 3 Amps |
| 1 Volts | 4 Watts | 4 Amps |
| 2 Volts | 2 Watts | 1 Amps |
| 2 Volts | 4 Watts | 2 Amps |
| 2 Volts | 6 Watts | 3 Amps |
| 2 Volts | 8 Watts | 4 Amps |
| 3 Volts | 3 Watts | 1 Amps |
| 3 Volts | 6 Watts | 2 Amps |
| 3 Volts | 9 Watts | 3 Amps |
| 3 Volts | 12 Watts | 4 Amps |
| 4 Volts | 4 Watts | 1 Amps |
| 4 Volts | 8 Watts | 2 Amps |
| 4 Volts | 12 Watts | 3 Amps |
| 4 Volts | 16 Watts | 4 Amps |
| 5 Volts | 5 Watts | 1 Amps |
| 5 Volts | 10 Watts | 2 Amps |
| 5 Volts | 15 Watts | 3 Amps |
| 5 Volts | 20 Watts | 4 Amps |
| 6 Volts | 6 Watts | 1 Amps |
| 6 Volts | 12 Watts | 2 Amps |
| 6 Volts | 18 Watts | 3 Amps |
| 6 Volts | 24 Watts | 4 Amps |
| 7 Volts | 7 Watts | 1 Amps |
| 7 Volts | 14 Watts | 2 Amps |
| 7 Volts | 21 Watts | 3 Amps |
| 7 Volts | 28 Watts | 4 Amps |
| 8 Volts | 8 Watts | 1 Amps |
| 8 Volts | 16 Watts | 2 Amps |
| 8 Volts | 24 Watts | 3 Amps |
| 8 Volts | 32 Watts | 4 Amps |
| 9 Volts | 9 Watts | 1 Amps |
| 9 Volts | 18 Watts | 2 Amps |
| 9 Volts | 27 Watts | 3 Amps |
| 9 Volts | 36 Watts | 4 Amps |
| 10 Volts | 10 Watts | 1 Amps |
| 10 Volts | 20 Watts | 2 Amps |
| 10 Volts | 30 Watts | 3 Amps |
| 10 Volts | 40 Watts | 4 Amps |
| 11 Volts | 11 Watts | 1 Amps |
| 11 Volts | 22 Watts | 2 Amps |
| 11 Volts | 33 Watts | 3 Amps |
| 11 Volts | 44 Watts | 4 Amps |
| 12 Volts | 12 Watts | 1 Amps |
| 12 Volts | 24 Watts | 2 Amps |
| 12 Volts | 36 Watts | 3 Amps |
| 12 Volts | 48 Watts | 4 Amps |
| 13 Volts | 13 Watts | 1 Amps |
| 13 Volts | 26 Watts | 2 Amps |
| 13 Volts | 39 Watts | 3 Amps |
| 13 Volts | 52 Watts | 4 Amps |
| 14 Volts | 14 Watts | 1 Amps |
| 14 Volts | 28 Watts | 2 Amps |
| 14 Volts | 42 Watts | 3 Amps |
| 14 Volts | 56 Watts | 4 Amps |
| 15 Volts | 15 Watts | 1 Amps |
| 15 Volts | 30 Watts | 2 Amps |
| 15 Volts | 45 Watts | 3 Amps |
| 15 Volts | 60 Watts | 4 Amps |
| 16 Volts | 16 Watts | 1 Amps |
| 16 Volts | 32 Watts | 2 Amps |
| 16 Volts | 48 Watts | 3 Amps |
| 16 Volts | 64 Watts | 4 Amps |
| 17 Volts | 17 Watts | 1 Amps |
| 17 Volts | 34 Watts | 2 Amps |
| 17 Volts | 51 Watts | 3 Amps |
| 17 Volts | 68 Watts | 4 Amps |
| 18 Volts | 18 Watts | 1 Amps |
| 18 Volts | 36 Watts | 2 Amps |
| 18 Volts | 54 Watts | 3 Amps |
| 18 Volts | 72 Watts | 4 Amps |
| 19 Volts | 19 Watts | 1 Amps |
| 19 Volts | 38 Watts | 2 Amps |
| 19 Volts | 57 Watts | 3 Amps |
| 19 Volts | 76 Watts | 4 Amps |
| 20 Volts | 20 Watts | 1 Amps |
| 20 Volts | 40 Watts | 2 Amps |
| 20 Volts | 60 Watts | 3 Amps |
| 20 Volts | 80 Watts | 4 Amps |
| 21 Volts | 21 Watts | 1 Amps |
| 21 Volts | 42 Watts | 2 Amps |
| 21 Volts | 63 Watts | 3 Amps |
| 21 Volts | 84 Watts | 4 Amps |
| 22 Volts | 22 Watts | 1 Amps |
| 22 Volts | 44 Watts | 2 Amps |
| 22 Volts | 66 Watts | 3 Amps |
| 22 Volts | 88 Watts | 4 Amps |
| 23 Volts | 23 Watts | 1 Amps |
| 23 Volts | 46 Watts | 2 Amps |
| 23 Volts | 69 Watts | 3 Amps |
| 23 Volts | 92 Watts | 4 Amps |
| 24 Volts | 24 Watts | 1 Amps |
| 24 Volts | 48 Watts | 2 Amps |
| 24 Volts | 72 Watts | 3 Amps |
| 24 Volts | 96 Watts | 4 Amps |
Learn more Ohm’s Law electrical formulas and see more conversions on our Ohm’s Law calculator.
