Electricity Cost Per kWh Calculator
Enter your unit rate to see what different amounts of electricity cost. Click an amount to try it.
Cost of electricity per kWh
Example rate — enter the unit rate on your bill.
Try a common amount
Estimated cost of 10 kWh
£2.50
At 25p per kWh, excluding standing charge.
| 1 kWh | £0.25 |
|---|---|
| 5 kWh | £1.25 |
| 10 kWh | £2.50 |
| 20 kWh | £5.00 |
| 50 kWh | £12.50 |
| 100 kWh | £25.00 |
Results are estimates. Your actual bill depends on your tariff, meter readings and how you use electricity.
What is a kWh?
A kilowatt-hour (kWh) is a unit of energy. It's the amount used by something drawing 1,000 watts for one hour — for example, a 1 kW heater left on for an hour, or a 100 W TV running for 10 hours.
Your electricity supplier charges a price for every kWh you use. This is called the unit rate and is usually shown in pence.
Where to find your price per kWh
Look on your latest bill, your supplier's app or your online account. If you're on a time-of-use tariff you may have more than one rate; try each one to compare. Learn more in our guide: What is a kWh?