Convert Watts to Volts Instantly
Accurately convert power to voltage for DC, AC single-phase & three-phase circuits. Supports current-based and resistance-based calculations.
Start CalculatingWatts to Volts Calculator
Select your circuit type and calculation method below
How to Convert Watts to Volts
The formulas behind each calculation mode
DC Circuit
V = P ÷ I Voltage equals power divided by current
V = √(P × R) Voltage equals square root of power times resistance
AC Single Phase
V = P ÷ (PF × I) Voltage equals power divided by power factor times current
V = √(P × R) Same resistance formula applies
AC Three Phase
V = P ÷ (√3 × PF × I) Divide by √3 × power factor × current
V = P ÷ (3 × PF × I) Divide by 3 × power factor × current
Watts to Volts Conversion Chart
Quick reference table for DC circuits at common current values
| Power (W) | @ 1 A | @ 5 A | @ 10 A | @ 15 A | @ 20 A |
|---|---|---|---|---|---|
| 10 W | 10 V | 2 V | 1 V | 0.6667 V | 0.5 V |
| 25 W | 25 V | 5 V | 2.5 V | 1.6667 V | 1.25 V |
| 50 W | 50 V | 10 V | 5 V | 3.3333 V | 2.5 V |
| 100 W | 100 V | 20 V | 10 V | 6.6667 V | 5 V |
| 150 W | 150 V | 30 V | 15 V | 10 V | 7.5 V |
| 200 W | 200 V | 40 V | 20 V | 13.3333 V | 10 V |
| 300 W | 300 V | 60 V | 30 V | 20 V | 15 V |
| 500 W | 500 V | 100 V | 50 V | 33.3333 V | 25 V |
| 750 W | 750 V | 150 V | 75 V | 50 V | 37.5 V |
| 1k W | 1,000 V | 200 V | 100 V | 66.6667 V | 50 V |
| 1.5k W | 1,500 V | 300 V | 150 V | 100 V | 75 V |
| 2k W | 2,000 V | 400 V | 200 V | 133.3333 V | 100 V |
| 3k W | 3,000 V | 600 V | 300 V | 200 V | 150 V |
| 5k W | 5,000 V | 1,000 V | 500 V | 333.3333 V | 250 V |
| 10k W | 10,000 V | 2,000 V | 1,000 V | 666.6667 V | 500 V |
Frequently Asked Questions
What is the formula to convert watts to volts?
For a DC circuit, voltage (V) = power (W) ÷ current (A). For an AC circuit, you must also divide by the power factor. If you know resistance instead of current, use V = √(P × R).
What is a power factor?
Power factor (PF) is a number between 0 and 1 that represents how effectively electrical power is being used. A power factor of 1 (unity) means all the power is being used effectively. Typical residential power factors range from 0.8 to 0.95.
What is the difference between DC and AC circuits?
DC (Direct Current) flows in one constant direction, like in batteries. AC (Alternating Current) periodically reverses direction and is what powers your home. AC calculations require a power factor because not all supplied power is used effectively.
When should I use line-to-line vs line-to-neutral voltage?
In a three-phase system, line-to-line voltage is measured between any two phase conductors (e.g., 480 V), while line-to-neutral is measured between a phase conductor and the neutral point (e.g., 277 V). Use line-to-line for motor loads and line-to-neutral for single-phase loads connected to a three-phase panel.
Can I convert watts to volts without knowing the current?
Yes! If you know the resistance (in ohms) instead of the current, you can use the formula V = √(P × R). Switch to the "Resistance (Ohms)" method in our calculator to use this approach.
What units of power does this calculator support?
Our calculator supports watts (W), kilowatts (kW), and milliwatts (mW). Simply select the appropriate unit from the dropdown next to the power input field. The calculator automatically converts your value to watts before computing the result.