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

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Convert Volts and Ohms to Watts

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Convert watts to volts

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

Equivalent volts and watts for various current ratings
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.