Introduction
This kW to Amps calculator converts kilowatts (kW) to amperes (A) for DC, AC single phase, and AC three phase circuits. Just enter your power, voltage, and power factor, and the tool gives you the current in amps right away. It works for milliwatts (mW), watts (W), and kilowatts (kW), so you can use it for small electronics or large industrial loads.
Knowing how many amps a device draws is important when you pick wire sizes, circuit breakers, or fuses. Instead of doing the math by hand, this calculator applies the correct formula for each current type. For DC, it divides power by voltage. For AC single phase, it accounts for the power factor. For AC three phase, it uses either the line-to-line or line-to-neutral formula with the √3 factor. The tool also shows a chart of how current changes as voltage goes up or down, so you can see the relationship clearly.
How to Use Our kW to Amps Calculator
Enter your power, voltage, and current type below. The calculator will instantly convert your kilowatts (kW) into amps (A).
Current Type: Pick the type of electrical current you are working with. Choose DC for batteries and solar panels, AC Single Phase for most home outlets, or AC Three Phase for industrial motors and large equipment.
Power: Type in the amount of power. Use the dropdown next to it to select milliwatts (mW), watts (W), or kilowatts (kW).
Voltage: Type in the voltage of your circuit. Use the dropdown to select millivolts (mV), volts (V), or kilovolts (kV). This value must be greater than zero.
Power Factor: This field only shows for AC circuits. Enter a number between 0.01 and 1. If you do not know your power factor, use 1 for a purely resistive load or 0.8 as a common estimate for motors.
Voltage Reference: This field only shows for three-phase AC. Choose Line to Line if you measured voltage between two hot wires. Choose Line to Neutral if you measured voltage between one hot wire and neutral.
Result Precision: Choose how many decimal places you want in your answer. You can pick any number from 0 to 8.
Press Calculate to see your result, or press Reset to clear all fields and start over. The chart below the result shows how the current changes as voltage goes up or down at your chosen power level.
How to Convert kW to Amps
Converting kilowatts (kW) to amps (A) means finding how much electric current flows through a circuit when you know the power and voltage. Power tells you how much energy a device uses. Voltage is the force that pushes electricity through a wire. Current, measured in amps, is the amount of electricity actually flowing. You need both power and voltage to find the current.
The Basic Formula
For a DC circuit, the formula is simple:
I (A) = 1,000 × P (kW) ÷ V (V)
You multiply the power in kilowatts by 1,000 to convert it to watts, then divide by the voltage in volts. The answer is the current in amps.
AC Circuits Are Different
AC circuits need one extra value called the power factor (PF). The power factor is a number between 0 and 1 that shows how efficiently the circuit uses electricity. A power factor of 1 means all the power is being used. Motors, compressors, and other devices with coils often have a power factor between 0.8 and 0.95.
For single-phase AC:
I (A) = 1,000 × P (kW) ÷ (PF × V)
For three-phase AC using line-to-line voltage:
I (A) = 1,000 × P (kW) ÷ (√3 × PF × V)
For three-phase AC using line-to-neutral voltage:
I (A) = 1,000 × P (kW) ÷ (3 × PF × V)
The √3 (square root of 3, which equals about 1.732) appears in three-phase calculations because three-phase power uses three wires that carry current in a balanced pattern.
When You Need This Conversion
Electricians and engineers use kW to amps conversion to pick the right wire size, choose the correct circuit breaker, and make sure electrical panels can handle the load. If you know a machine uses 5 kW on a 240V single-phase circuit with a power factor of 0.9, this conversion tells you the wire must carry about 23.15 amps. That information helps you select safe wiring and protection for the circuit, and a voltage drop check confirms your wire run length won't cause excessive voltage loss.