Enter your Current Type (AC or DC), Current (amps), Voltage (volts), and Power Factor (for AC circuits) into this Amps to kW Calculator to find your Power in kilowatts, with bonus results in watts and milliwatts too.
Power
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Power (Watts)
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Power (Milliwatts)
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For DC: P(kW) = I(A) × V(V) ÷ 1000. For AC single phase: P(kW) = PF × I(A) × V(V) ÷ 1000. For AC three phase: P(kW) = √3 × PF × I(A) × V(V) ÷ 1000.
Power factor is the ratio of real power to apparent power in AC circuits, ranging from 0 to 1. It's crucial for AC calculations because it accounts for the phase difference between voltage and current. Higher power factor means more efficient power usage.
Typical power factor values: Incandescent lamps (1.0), Fluorescent lamps (0.95), Electric motors (0.8-0.85), Welding equipment (0.5), and Power supplies (0.6-0.8). Always check device specifications for accurate values.
For three phase AC, use √3 (1.732) multiplier with power factor. Line-to-line voltage uses the full line voltage, while line-to-neutral uses 3 times the phase voltage instead of √3.
No, voltage is essential for power calculations. Power equals current times voltage, so both values are required. You must know the system voltage to accurately convert amperes to kilowatts.
kW (kilowatts) measures power - the rate of energy consumption at an instant. kWh (kilowatt-hours) measures energy - the total amount consumed over time. This calculator converts to kW (power), not energy.
AC circuits often have reactive components that cause voltage and current to be out of phase. Power factor accounts for this phase difference, giving you the actual usable power rather than just the apparent power.
The calculations are mathematically precise using standard electrical formulas. However, real-world accuracy depends on having correct input values for current, voltage, and power factor, which can vary with load conditions and equipment tolerances.