Volts to Watts Calculator

Convert electric potential in Volts (V) to electric power in Watts (W).

V
A

How to Convert Volts to Watts

Volt (V) is the unit of electric potential difference.

Watt (W) is the unit of electric power.

Calculating Watts from Volts requires knowing the current (Amps) and the type of current (DC or AC).

DC Watts Calculation Formula

For DC circuits, power (in Watts) is equal to the voltage (in Volts) multiplied by the current (in Amps).

P(W) = V(V) × I(A)

AC Watts Calculation Formula

For AC circuits, the Power Factor (PF) must be included.

Single Phase AC

P(W) = V(V) × I(A) × PF

Three Phase AC (Line-to-Line Voltage)

P(W) = √3 × VL-L(V) × I(A) × PF

Three Phase AC (Line-to-Neutral Voltage)

P(W) = 3 × VL-N(V) × I(A) × PF

Typical Power Factor Values

Do not use typical power factor values for accurate calculations.

Appliance / Load Power Factor
Resistive load (Heater, Incandescent light)1.0
LED / Fluorescent lamp0.95
Induction Motor (Full load)0.85
Induction Motor (No load)0.35

Calculation Example

Question: A circuit has 120 Volts and draws 15 Amps. What is the power?

Answer:
P = 120 V × 15 A = 1800 Watts

Volts to Watts Conversion Table

The table below shows power values for various voltages at 10 Amps current.

Voltage (Volts) Current (Amps) Power (Watts)
12 V10 A120 W
24 V10 A240 W
100 V10 A1000 W
110 V10 A1100 W
120 V10 A1200 W
220 V10 A2200 W
230 V10 A2300 W
240 V10 A2400 W