Watts to kWh converter
Turn a power rating and a running time into kilowatt hours, the units on your bill.
A kilowatt hour is the unit your electricity bill is counted in.
The sum
Watts measure how fast something uses electricity. Kilowatt hours measure how much it has used. Divide the watts by 1,000 to get kilowatts, then multiply by the hours it runs.
| Power | Used in an hour | Cost at 26.32p per kWh |
|---|---|---|
| 10 W | 0.01 kWh | 0.3p |
| 100 W | 0.1 kWh | 2.6p |
| 500 W | 0.5 kWh | 13.2p |
| 1,000 W | 1 kWh | 26.3p |
| 2,000 W | 2 kWh | 52.6p |
| 3,000 W | 3 kWh | 79p |
To turn kWh into money, multiply by the price of a kWh. The running cost calculator does both steps, using the price cap for your region.