Watts (W) to Volts (V) Converter

What Is a Watts (W)?

Watts (W) measure electrical power, or how much energy a device uses each second. A watt shows the rate of power use in a circuit, appliance, motor, panel, or other electrical load.

What Is a Volts (V)?

Volts (V) measure electrical voltage, or the force that pushes current through a circuit. Voltage helps determine how electrical power moves through wires, devices, batteries, and equipment.

How to Convert Watts (W) to Volts (V) manually?

You can calculate voltage when you know electrical power and current. The basic relationship comes from the power equation, $P = V \times I$. Rearrange it to find voltage.

Formula

$V = P / I$

Step by step Guide

1. Enter power in watts.
2. Enter current in amps.
3. Divide watts by amps.
4. Record the result in volts.

Practical Example

For 1,200 W and 10 A:

$V = 1,200 / 10 = 120 V$

The result is 120 volts.

DC Watts to Volts Calculation

For a DC circuit, divide power in watts by current in amps. This method works when the circuit has direct current and you know both values. Batteries and many electronic systems use DC power.

Formula

$V = P / I$

Step by step Guide

1. Enter the DC power in watts.
2. Enter the DC current in amps.
3. Divide power by current.
4. Express the result in volts.

Practical Example

A DC system uses 600 W at 25 A.

$V = 600 / 25 = 24 V$

The calculated DC voltage is 24 volts.

AC Single Phase Watts to Volts Calculation

AC single phase systems may need power factor when you calculate voltage. Power factor shows how effectively the circuit uses electrical power. Use the real power value in watts for this calculation.

Formula

$V = P / (PF \times I)$

Step by step Guide

1. Enter power in watts.
2. Enter current in amps.
3. Enter the power factor.
4. Multiply power factor by current.
5. Divide watts by that result.

Practical Example

A load uses 1,200 W at 10 A with a 0.8 power factor.

$V = 1,200 / (0.8 \times 10) = 150 V$

The calculated voltage is 150 volts.

AC Three Phase Watts to Volts Calculation

Three phase AC systems use a different formula because three phases share the electrical load. You also need current and power factor. The formula depends on whether you need line to line or line to neutral voltage.

Formula

For line to line voltage:

$V_{LL} = P / (\sqrt{3} \times PF \times I)$

For line to neutral voltage:

$V_{LN} = P / (3 \times PF \times I)$

Step by step Guide

1. Enter three phase power in watts.
2. Enter current in amps.
3. Enter the power factor.
4. Choose the required voltage type.
5. Apply the matching formula.

Practical Example

For 6,928 W, 20 A, and a 1.0 power factor:

$V_{LL} = 6,928 / (\sqrt{3} \times 20) \approx 200 V$

The line to line voltage is about 200 V.

Calculation with Line to Line Voltage

Line to line voltage measures the voltage between two phases in a three phase AC system. Use this formula when your equipment specifies line to line voltage.

Formula

$V_{LL} = P / (\sqrt{3} \times PF \times I)$

Step by step Guide

1. Enter power in watts.
2. Enter phase current in amps.
3. Enter power factor.
4. Multiply $\sqrt{3}$, power factor, and current.
5. Divide watts by the result.

Practical Example

For 10,392 W, 30 A, and PF = 1:

$V_{LL} = 10,392 / (1.732 \times 30) \approx 200 V$

The result is about 200 V line to line.

Calculation with Line to Neutral Voltage

Line to neutral voltage measures the voltage between one phase and the neutral point. Use this calculation when equipment or wiring specifies line to neutral voltage.

Formula

$V_{LN} = P / (3 \times PF \times I)$

Step by step Guide

1. Enter power in watts.
2. Enter phase current in amps.
3. Enter power factor.
4. Multiply 3, power factor, and current.
5. Divide watts by the result.

Practical Example

For 6,000 W, 10 A, and PF = 1:

$V_{LN} = 6,000 / (3 \times 10) = 200 V$

The result is 200 V line to neutral.

Convert Watts to Volts Using Resistance

You can calculate voltage from watts and resistance for a resistive load. This method comes from the power relationship $P = V^2 / R$. It does not use current as the input.

Formula

$V = \sqrt{P \times R}$

Step by step Guide

1. Enter power in watts.
2. Enter resistance in ohms.
3. Multiply watts by resistance.
4. Find the square root.
5. Express the result in volts.

Practical Example

A resistive load uses 100 W with 144 Ω resistance.

$V = \sqrt{100 \times 144} = 120 V$

The calculated voltage is 120 volts.

Watts (W) to Volts (V) Conversion Chart

Note: This chart assumes 10 A current. Watts alone cannot determine voltage without another electrical value.