Amps to Kilowatts Calculator

What is an amps to kilowatts calculator?

An amps to kilowatts calculator turns a measured current and voltage into electrical power expressed in kilowatts. Current is measured in amperes (amps, A), voltage in volts (V), and the result, power, in kilowatts (kW). Because a kilowatt is one thousand watts, this conversion is convenient for larger loads such as ovens, electric heaters, water pumps, EV chargers, and whole circuits, where a value in watts would run into the thousands.

How does it work?

Electrical power equals current multiplied by voltage. Watts come straight out of that product, and dividing by 1000 rescales the answer into kilowatts:

where $P_{kW}$ is power in kilowatts, $I$ is current in amps, and $V$ is voltage in volts. This is the direct-current (DC) form; for a purely resistive alternating-current (AC) load it holds as well, while reactive loads also depend on the power factor.

How to use

1. Enter the current in amps.
2. Enter the voltage in volts.
3. Read the resulting power in kilowatts. The result appears only once both fields are filled in.

Worked examples

A device drawing 10 A on a 120 V supply:

The same 1.2 kW results from a smaller current at a higher voltage, for example 5 A at 240 V:

And a current of 1 A across 1000 V gives exactly one kilowatt:

Practical notes

For a purely resistive load (such as a heater or incandescent bulb), kilowatts = amps times volts divided by 1000 works directly. For reactive loads (motors, transformers), real power also depends on the power factor, so multiply by that factor for an accurate figure.

To work in watts instead of kilowatts, drop the division by 1000 with the amps to watts calculator. To go the other way and find current from power, divide power by voltage with the kilowatts to amps calculator or the watts to amps calculator.