ORANGEBOT.AI
Electrical & Lighting · Conversion · Free

Volts to Kilowatts Calculator

Convert voltage in volts (V) to power in kilowatts (kW). Select the current type — DC, AC single phase or AC three phase — enter the voltage in volts, the current in amps and, for AC, the power factor, then press Calculate to get the power in kilowatts. Everything runs locally in your browser.

P(kW) = V(V) × I(A) / 1000

Enter the voltage in volts as a number of zero or greater

Enter the current in amps as a number of zero or greater

STEP 1

Select the current type

Pick DC for direct current, AC - Single phase for ordinary mains circuits, or AC - Three phase for three-phase supplies. The power-factor field appears only for the AC modes.

STEP 2

Enter volts, amps and power factor

Type the voltage in volts and the current in amps. For AC modes also enter the power factor between 0 and 1 (0.8 to 1 is typical for motor and heater loads). Enter 1 for a purely resistive AC load.

STEP 3

Press Calculate, read kilowatts

The result appears in kilowatts (kW) with at most 6 decimal places. Press Reset to clear everything and start over. One kilowatt equals 1,000 watts, so results are exactly 1/1000 of the equivalent watts figure.

Volts to kilowatts calculation

What is the DC volts to kilowatts formula?
The power P in kilowatts (kW) is equal to the voltage V in volts (V), times the current I in amps (A), divided by 1000: P(kW) = V(V) × I(A) / 1000. For example, a device on a 240 V supply drawing 10 A consumes 240 × 10 / 1000 = 2.4 kW.
What is the AC single phase formula?
The power P in kilowatts (kW) is equal to the power factor PF times the current I in amps (A), times the voltage V in volts (V), divided by 1000: P(kW) = PF × I(A) × V(V) / 1000. A 120 V circuit drawing 10 A at PF 0.8 uses 0.8 × 10 × 120 / 1000 = 0.96 kW.
What is the AC three phase formula?
The power P in kilowatts (kW) is equal to square root of 3 times the power factor PF times the current I in amps (A), times the line to line RMS voltage VL-L in volts (V), divided by 1000: P(kW) = √3 × PF × I(A) × VL-L(V) / 1000 ≈ 1.732 × PF × I(A) × VL-L(V) / 1000. This calculator multiplies by exact √3 and treats the voltage you enter as line-to-line. A 480 V, 25 A, PF 0.9 load is √3 × 0.9 × 25 × 480 / 1000 ≈ 18.706149 kW.
Why does the calculator want a power factor, and why only between 0 and 1?
In AC circuits with motors, transformers or electronics, current and voltage are not in phase, so real power is lower than V × I. The power factor is the ratio of real power to apparent power and lies between 0 and 1 — a value outside that range cannot describe a passive load, so it is rejected as an input error. DC has no power factor, so the field is hidden in DC mode.
How do I get amps or watts instead?
Kilowatts are watts divided by 1000, so any volts-to-watts result is 1000× the kW figure shown here. To work backwards from power to current, rearrange the same formulas: for DC, I(A) = P(kW) × 1000 / V(V); for AC single phase, I(A) = P(kW) × 1000 / (PF × V(V)).

Privacy: every calculation runs in your browser tab — no value you type is sent anywhere. Results are ideal steady-state values for balanced loads; verify real installations with a multimeter or power analyzer.