Kilowatts to Volts Calculator
Convert electric power in kilowatts (kW) to voltage in volts (V). Pick the circuit type — DC, AC single-phase or AC three-phase — enter the power in kilowatts, the current in amps and, for AC, the power factor, then press Calculate. The voltage appears in volts. Everything runs locally in your browser.
Choose the circuit type
DC, AC single-phase, or AC three-phase. Three-phase returns the line-to-line RMS voltage. AC modes also ask for the power factor (greater than 0 and up to 1); it is disabled for DC because the DC formula has none.
Enter power and current
Type the power in kilowatts (kW) and the current in amps (A) — scientific notation like 5e3 works too. For AC, add the power factor next to them.
Press Calculate, read volts
The voltage appears in volts (V), shown to at most ten significant digits, with a worked line underneath. Copy the result to your clipboard, or press Reset to start over.
How kilowatts become volts
- What is the DC kilowatts-to-volts formula?
- The voltage V in volts (V) is equal to 1000 times the power P in kilowatts (kW), divided by the current I in amps (A): V = 1000 × P / I. Worked example: P = 1 kW at I = 5 A gives V = 1000 × 1 / 5 = 200 V.
- How does AC single-phase differ?
- The voltage V in volts is equal to 1000 times the power P in kilowatts divided by the power factor PF times the current I in amps: V = 1000 × P / (PF × I). Worked example: P = 2 kW, I = 10 A, PF = 0.8 gives V = 250 V.
- What about AC three-phase?
- The line-to-line RMS voltage is V = 1000 × P / (√3 × PF × I), where √3 ≈ 1.732 is taken exactly as the square root of 3. So 3 kW at 10 A with PF 1 gives 173.2050808 V line-to-line. This calculator computes the line-to-line voltage only.
- Which power factor should I use?
- See the typical values table below. Do not use typical power factor values for accurate calculations — measure or check the nameplate.
- When does the calculator show an error?
- A current of 0 A is rejected (the voltage would divide by zero), and so is a power factor outside 0 to 1 for AC. A result beyond the number range reports "Result is too large to display" instead of printing Infinity; zero power is always valid and gives 0 V.
Typical power factor values
Do not use typical power factor values for accurate calculations.
| Device | Typical power factor |
|---|---|
| Resistive load | 1 |
| Fluorescent lamp | 0.95 |
| Incandescent lamp | 1 |
| Induction motor (full load) | 0.85 |
| Induction motor (no load) | 0.35 |
| Resistive oven | 1 |
| Synchronous motor | 0.9 |
Privacy: every calculation runs in your browser tab — no value you type is sent anywhere. Copy result uses your clipboard only. Results are ideal circuit-theory figures; verify real installations with a multimeter.