Watts to Volts Calculator

To use the calculator, select the current type, enter the power in watts and current in amps, and provide the power factor (a value between 0 and 1) for AC systems. For AC three phase systems, choose between line to line or line to neutral voltage. Click the “Calculate” button to display the voltage result in volts in the output section. Click “Reset” to clear all fields and revert to the default settings.

Input

Current Type: DC AC - Single phase AC - Three phase
Enter power in watts:

Voltage Type: Line to Line Voltage Line to Neutral Voltage

Enter current in amps:

Power factor (≤1):

Calculate Reset

Output:

Voltage result in volts:

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Volts to watts calculator ►

DC Watts to Volts Calculation

V_(V) = P_(W) / I_(A), where

V_(V) – voltage in volts (V),

P_(W) – power in watts (W),

I_(A) – electric current in amps (A).

Example.

Let’s say we have a device that has a power rating of 60 watts, and we want to find out the voltage required to power it. We can use the formula:

V_(V) = P_(W) / I_(A) = 60 watts / 2 amperes = 30 volts

AC Single Phase Watts to Volts Calculation

V_(V) = P_(W) / (PF × I_(A)), where

V_(V) – RMS voltage in volts (V),

P_(W) – power in watts (W),

PF – power factor,

I_(A) – phase current in amps (A).

Example.

Let’s say we have a single-phase AC circuit with a power consumption of 500 watts, and we want to find out the voltage of the circuit. Electric current in the circuit is 2.5 amperes. The power factor is a measure of how efficiently the circuit is using the supplied power. For this example, let’s assume a power factor of 0.8.

We can use the following formula:

V_(V) = P_(W) / (PF × I_(A)) = 500 watts / (2.5 amperes x 0.8) = 250 volts

AC Three Phase Watts to Volts Calculation

Calculation with Line to Line Voltage

V_L-L(V) = P_(W) / (√3 × PF × I_(A)), where

V_L-L(V) – line to line RMS voltage in volts (V),

P_(W) – power in watts (W),

PF – power factor,

I_(A) – phase current in amps (A).

Example.

Let’s say we have a three-phase AC circuit with a power consumption of 10,000 watts and a power factor of 0.9, and we want to find out the line to line voltage of the circuit. Electric current in the circuit is 30 amperes.

We can use the following formula:

V_L-L(V) = P_(W) / (√3 × PF × I_(A)) = 10,000 watts / (√3 x 30 amperes x 0.9) = 213.83 volts

Calculation with Line to Neutral Voltage

V_L-N(V) = P_(W) / (3 × PF × I_(A)), where

V_L-N(V) – line to neutral RMS voltage (V),

P_(W) – power in watts (W),

PF – power factor,

I_(A) – phase current in amps (A).

Watts to Volts Conversion Chart

Here’s a DC Watts to Volts conversion chart for a current of 1 amp:

Watts (W)	Volts (V)
1 watts	1 volts
2 watts	2 volts
10 watts	10 volts
20 watts	20 volts
30 watts	30 volts
40 watts	40 volts
50 watts	50 volts
60 watts	60 volts
70 watts	70 volts
80 watts	80 volts
90 watts	90 volts
100 watts	100 volts
120 watts	120 volts
140 watts	140 volts
160 watts	160 volts
180 watts	180 volts
200 watts	200 volts
750 watts	750 volts

See Also