Conversions

kW to kWh Calculator

Power (kW) is the rate of use; energy (kWh) is power used over time. This calculator converts a kW rating and run time into kWh, plus its cost.

Your details

kW
h
$ /kWh

Results

Energy used
—
Cost
—

Last updated June 30, 2026. Results update automatically as you type.

How it works

Energy (kWh) = power (kW) × time (hours). Cost = energy × rate. For watts instead of kilowatts, divide watts by 1000 first (e.g. 1500 W = 1.5 kW).

Frequently asked questions

What’s the difference between kW and kWh?

kW is power — how fast energy is used. kWh is energy — how much is used over time. A 2 kW heater running 3 hours uses 6 kWh.

How do I convert watts to kW?

Divide by 1000. 500 W = 0.5 kW, 1500 W = 1.5 kW.

Why does my bill use kWh?

You are billed for total energy consumed, which is measured in kWh, not for the instantaneous power (kW).

These calculators provide general estimates for educational purposes only and are not financial advice. Real-world results depend on factors not captured here. Verify figures independently before making any purchase or financial decision.

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