Amps to Kilowatts Calculator
Convert current in amps (A) to power in kilowatts (kW). Choose Direct Current (DC), AC single phase, or AC three phase, enter the current and voltage (with power factor for AC), and press Calculate to get power in kW, watts and milliwatts. Everything runs locally in your browser.
Choose the current type
Pick Direct Current (DC), Alternating Current (AC) - Single phase, or Alternating Current (AC) - Three phase. For three phase, also pick line-to-line or line-to-neutral voltage.
Enter current, voltage, power factor
Type the current (mA / A / kA) and the voltage (mV / V / kV). For AC circuits also enter the power factor — a value greater than 0 and up to 1. Scientific notation like 5e3 works.
Press Calculate, read kW
Power appears in kilowatts (kW), watts (W) and milliwatts (mW) at once. Copy any of the three values to your clipboard, or press Reset to start over.
How amps become kilowatts
- How do you convert amps to kW for DC?
- The power P in kilowatts (kW) is equal to the current I in amps (A), times the voltage V in volts (V), divided by 1000: P(kW) = I(A) × V(V) / 1000. For example, 10 A at 120 V gives 10 × 120 / 1000 = 1.2 kW.
- How do you convert amps to kW for AC single phase?
- The power P in kilowatts (kW) is equal to the power factor PF times the phase current I in amps (A), times the RMS voltage V in volts (V), divided by 1000: P(kW) = PF × I(A) × V(V) / 1000. For example, 5 A at 230 V with PF 0.9 gives 0.9 × 5 × 230 / 1000 = 1.035 kW.
- How do you convert amps to kW for AC three phase?
- With line-to-line voltage: P(kW) = √3 × PF × I(A) × VL-L(V) / 1000 — e.g. 25 A at 400 V with PF 0.85 gives √3 × 0.85 × 25 × 400 / 1000 ≈ 14.722 kW. With line-to-neutral voltage: P(kW) = 3 × PF × I(A) × VL-N(V) / 1000 — the same 25 A at 230 V (line-to-neutral) with PF 0.85 gives 14.6625 kW.
- What power factor should I enter?
- Typical values: 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. Do not use typical power factor values for accurate calculations — measure or check the nameplate.
- Why does the calculator ignore power factor on DC?
- A DC circuit has no phase shift between voltage and current, so there is no power factor term: P(kW) = I × V / 1000 stands on its own. The power factor field only appears for the two AC current types.
Privacy: every calculation runs in your browser tab — no value you type is sent anywhere. Copy buttons use your clipboard only. Results assume ideal sinusoidal RMS quantities; verify real installations with a meter.