Kilowatts to amps calculator

What is a kilowatts to amps calculator?

A kilowatts to amps calculator converts electrical power, measured in kilowatts (kW), into electric current, measured in amps (A), for a known voltage. Because power, voltage, and current are linked, knowing any two lets you solve for the third. This tool is handy when sizing circuit breakers, picking the right cable gauge, or checking whether an appliance will overload a supply.

Formula

Power in watts equals voltage times current, so current is power divided by voltage. Since one kilowatt is 1000 watts:

where $I$ is the current in amps, $P$ is the power in kilowatts, and $V$ is the voltage in volts. The voltage must be non-zero, otherwise the current is undefined.

How to use

1. Enter the power in kilowatts.
2. Enter the voltage in volts.
3. The current in amps is calculated automatically once both values are present and the voltage is not zero.

Worked example

Suppose an appliance is rated at 3.6 kW and runs on a 240 V supply:

So the appliance draws 15 amps of current.

FAQ

Does this formula work for three-phase systems?

No. This calculator assumes a single-phase (or DC) supply where power equals voltage times current. Three-phase systems include an additional factor (the square root of three and the power factor), so they need a dedicated three-phase calculation.

Why does the result need a non-zero voltage?

Current is power divided by voltage. Dividing by zero is mathematically undefined, so the calculator only produces a result when the voltage is greater than zero.