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Amps to kW Converter

Enter the current, voltage and phase to convert amps into kilowatts. Add a power factor for motors and other loads.

A

The current drawn, in amps.

V

Malaysia uses 240 V for single phase, and 415 V between the lines of a three-phase supply.

Supply
Advanced

1 for heaters and kettles. Motors and air conditioners are often 0.8 to 0.9.

This result is an estimate only. Double-check important figures before relying on them.

How it is calculated

  • Single phase: kW = volts × amps × power factor ÷ 1,000
  • Three phase: kW = √3 × volts × amps × power factor ÷ 1,000, using the voltage between lines
  • kVA = the same, without the power factor
  • Watts = kW × 1,000

To turn kW into a bill, use the kWh calculator and the TNB electricity bill calculator. For voltage, current and resistance, use the Ohm’s law calculator.

Worked example

  • Single phase, 10 A at 240 V, power factor 1: 240 × 10 ÷ 1,000 = 2.4 kW
  • Three phase, 10 A at 415 V, power factor 0.8: 1.732 × 415 × 10 × 0.8 ÷ 1,000 = 5.75 kW
  • A 32 A single-phase supply at 240 V can supply up to 7.68 kW

Why your number may differ

Real voltage varies a little from the nominal value. The power factor changes with the load. Always follow a qualified electrician and local regulations for wiring and safety.

Frequently asked questions

How do I convert amps to kW?

For single phase, kW = volts × amps × power factor ÷ 1,000. For three phase, kW = √3 × line voltage × amps × power factor ÷ 1,000.

What is the power factor?

It shows how much of the current does useful work. A resistive load such as a heater has a power factor of 1. Motors and many appliances are lower.

What is the difference between kW and kVA?

kW is the real power used. kVA is the apparent power the supply must carry. kW = kVA × power factor.

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