Measure electricity used
We subtract the previous meter reading from the current reading to find the kilowatt hours used.
Free UK electricity estimate
Work out your electricity bill from your meter readings
Enter two meter readings and the rates from your latest tariff for a clear estimate of usage, standing charges and VAT.
- ✓ Instant calculation
- ✓ No sign-up
- ✓ Your figures stay on this device
Simple and transparent
How your estimate is calculated
The familiar calculation from the original site, explained more clearly.
Add your tariff charges
Your usage is multiplied by the unit rate, then the daily standing charge is added for the billing period.
Include VAT
Domestic energy VAT at 5% is added to give the estimated bill total and useful daily and annual projections.
Electricity calculator quick help
Use readings from the same meter
Enter the older reading first and the newer reading second. Ignore digits shown in red and numbers after a decimal point. Economy 7 meters have two readings that should be calculated separately.
Learn how to read your meter →Works with tariff figures from any UK electricity supplier
