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
Convert Watts and Ohms to Volts
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
| 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.
