Kw To Amps Converter
Instantly convert kilowatts (kW) to amps (A) for DC, single-phase AC, and three-phase AC circuits. Ideal for sizing cables, breakers, and fuses.
Power to Current Details
Enter your power, voltage, and circuit type to calculate amps
Choose the type of electrical supply you’re calculating for.
Enter the power rating in kilowatts.
UK mains is typically 230V single-phase or 400V three-phase.
Use 1 for resistive loads (heaters), 0.8–0.9 for motors and inductive loads.
Number of decimal places shown in the result.
Conversion Results
Your calculated current and calculation breakdown
Enter your power, voltage, and circuit type above, then click Convert Now to see the current in amps.
Common Kw To Amps Conversions
Approximate current draw at standard UK voltages, assuming a power factor of 1 (single-phase at 230V, three-phase at 400V).
| Power (kW) | Single-Phase (230V) | Three-Phase (400V) |
|---|---|---|
| 1 kW | 4.35 A | 1.44 A |
| 3 kW | 13.04 A | 4.33 A |
| 5 kW | 21.74 A | 7.22 A |
| 7 kW | 30.43 A | 10.10 A |
| 10 kW | 43.48 A | 14.43 A |
| 20 kW | 86.96 A | 28.87 A |
Kw To Amps FAQ
Everything you need to know about converting kilowatts to amps across DC and AC circuits.
For a DC circuit, divide the power in watts (kW x 1000) by the voltage. For single-phase AC, also divide by the power factor. For three-phase AC, divide by the voltage, the power factor, and the square root of 3 (approximately 1.732).
The three-phase formula is Amps equals kilowatts multiplied by 1,000, divided by the voltage, the power factor, and the square root of 3 (approximately 1.732). This accounts for the phase difference across three conductors.
A power factor of 1 (unity) is used for purely resistive loads such as heaters. Most motors and inductive equipment typically operate around 0.8 to 0.85. Check the equipment nameplate for the exact power factor whenever possible.
In a three-phase system, the voltages across the three conductors are offset by 120 degrees. The square root of 3 (about 1.732) accounts for this phase relationship when calculating the total current from the total power.
This conversion is essential when sizing circuit breakers, cables, and fuses for appliances, motors, or generators, since electrical equipment is often rated in kilowatts but wiring and protection devices are rated in amps.