Watts to Volts Electrical Conversion Calculator

Convert watts to volts by entering the wattage and current in amps, or the circuit resistance below.

Convert Watts and Amps to Volts

watts

Convert Watts and Ohms to Volts

watts

Results:

  Volts


Convert volts to watts

How to Convert Watts to Volts

Watts can be converted to volts using current and a Watt’s Law formula, which states that current is equal to power divided by voltage. We can change this formula around a bit using algebra to restate it as voltage is equal to power divided by current.

This is the formula to convert wattage to voltage:

Voltage(V) = Power(W) ÷ Current(A)

We can use this formula to solve for voltage by dividing the wattage by the amperage.

For example, let’s convert 20 watts to volts using a DC circuit with 4 amps of current.

Voltage(V) = 20 W ÷ 4 A
Voltage(V) = 5 volts

Conversion on an AC Circuit

Converting wattage to voltage on an AC circuit is pretty similar to a DC circuit, with a slight change to account for the power factor of an AC circuit. For an AC circuits, voltage is equal to the watts divided by the current in amps times the power factor.

Voltage(V) = Power(W) ÷ (Current(A) × PF)

For example, let’s convert 1,300 watts to voltage, for an AC electrical circuit with 12 amps of current and a power factor of .9.

Voltage(V) = 1,300 W ÷ (12 A × .9)
Voltage(V) = 120.4 volts

Convert Watts to Volts using Resistance

You can also convert watts to volts if the resistance of the circuit is known. Voltage is equal to the square root of the wattage times the resistance in ohms.

Voltage(V) = (Power (W) × Resistance (Ω))

For example, let’s convert 40 watts to volts, for a DC circuit with 10 ohms of resistance.

Voltage(V) = (40 W × 10 Ω)
Voltage(V) = 400
Voltage(V) = 20 volts

Equivalent Watts and Volts Measurements

Equivalent watts and volts for various current ratings
Power Voltage Current
5 Watts 5 Volts 1 Amps
5 Watts 2.5 Volts 2 Amps
5 Watts 1.667 Volts 3 Amps
5 Watts 1.25 Volts 4 Amps
10 Watts 10 Volts 1 Amps
10 Watts 5 Volts 2 Amps
10 Watts 3.333 Volts 3 Amps
10 Watts 2.5 Volts 4 Amps
15 Watts 15 Volts 1 Amps
15 Watts 7.5 Volts 2 Amps
15 Watts 5 Volts 3 Amps
15 Watts 3.75 Volts 4 Amps
20 Watts 20 Volts 1 Amps
20 Watts 10 Volts 2 Amps
20 Watts 6.667 Volts 3 Amps
20 Watts 5 Volts 4 Amps
25 Watts 25 Volts 1 Amps
25 Watts 12.5 Volts 2 Amps
25 Watts 8.333 Volts 3 Amps
25 Watts 6.25 Volts 4 Amps
30 Watts 30 Volts 1 Amps
30 Watts 15 Volts 2 Amps
30 Watts 10 Volts 3 Amps
30 Watts 7.5 Volts 4 Amps
35 Watts 35 Volts 1 Amps
35 Watts 17.5 Volts 2 Amps
35 Watts 11.667 Volts 3 Amps
35 Watts 8.75 Volts 4 Amps
40 Watts 40 Volts 1 Amps
40 Watts 20 Volts 2 Amps
40 Watts 13.333 Volts 3 Amps
40 Watts 10 Volts 4 Amps
45 Watts 45 Volts 1 Amps
45 Watts 22.5 Volts 2 Amps
45 Watts 15 Volts 3 Amps
45 Watts 11.25 Volts 4 Amps
50 Watts 50 Volts 1 Amps
50 Watts 25 Volts 2 Amps
50 Watts 16.667 Volts 3 Amps
50 Watts 12.5 Volts 4 Amps
55 Watts 55 Volts 1 Amps
55 Watts 27.5 Volts 2 Amps
55 Watts 18.333 Volts 3 Amps
55 Watts 13.75 Volts 4 Amps
60 Watts 60 Volts 1 Amps
60 Watts 30 Volts 2 Amps
60 Watts 20 Volts 3 Amps
60 Watts 15 Volts 4 Amps
65 Watts 65 Volts 1 Amps
65 Watts 32.5 Volts 2 Amps
65 Watts 21.667 Volts 3 Amps
65 Watts 16.25 Volts 4 Amps
70 Watts 70 Volts 1 Amps
70 Watts 35 Volts 2 Amps
70 Watts 23.333 Volts 3 Amps
70 Watts 17.5 Volts 4 Amps
75 Watts 75 Volts 1 Amps
75 Watts 37.5 Volts 2 Amps
75 Watts 25 Volts 3 Amps
75 Watts 18.75 Volts 4 Amps
80 Watts 80 Volts 1 Amps
80 Watts 40 Volts 2 Amps
80 Watts 26.667 Volts 3 Amps
80 Watts 20 Volts 4 Amps
85 Watts 85 Volts 1 Amps
85 Watts 42.5 Volts 2 Amps
85 Watts 28.333 Volts 3 Amps
85 Watts 21.25 Volts 4 Amps
90 Watts 90 Volts 1 Amps
90 Watts 45 Volts 2 Amps
90 Watts 30 Volts 3 Amps
90 Watts 22.5 Volts 4 Amps
95 Watts 95 Volts 1 Amps
95 Watts 47.5 Volts 2 Amps
95 Watts 31.667 Volts 3 Amps
95 Watts 23.75 Volts 4 Amps
100 Watts 100 Volts 1 Amps
100 Watts 50 Volts 2 Amps
100 Watts 33.333 Volts 3 Amps
100 Watts 25 Volts 4 Amps

Check out our Ohm’s Law calculator for more electrical conversion formulas.