Measure gas used
We subtract your previous reading from your current reading to find the units consumed.
Free UK gas estimate
Work out your gas bill from your meter readings
Enter two readings and your tariff details for a clear estimate of your usage, charges and VAT. Your figures are processed on this device. Your latest result is kept in this browser session so you can refresh the results page.
- ✓ Instant calculation
- ✓ No sign-up
- ✓ Runs in your browser
Simple and transparent
How your estimate is calculated
The same established gas conversion used by the original calculator, shown more clearly.
Follow a worked gas bill calculation or compare typical gas costs and usage.
Convert to kWh
Units are converted using your meter type, volume correction and calorific value.
Add charges and VAT
We apply your unit rate, daily standing charge and domestic energy VAT at 5%.
Reading your meter
Metric or imperial?
A metric meter is marked m³. An older imperial meter is marked ft³. Only enter the digits before the decimal point or any red digits.
See how to read each type of gas meterNews and practical guidance
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