Your Gas Meter Readings Explained

Most modern gas meters have a similar layout, recording in cubic metres (m³) equivalent to 1,000 litres of gas.

Gas meter

Your meter will look something like the photo above, with the black and white digits recording full units and red digits recording down as low as a single litre. Since gas is charged in in full units, meter readings for your bill refer only to the black and white digits.

Gas meter explained

Using the steps below you can estimate* your next gas bill:

1. Subtract the previous meter reading (your last bill) from the reading currently on your meter.
2. Multiply the result by 2.83 to obtain the volume used in cubic metres. (This step is unnecessary for customers with m3 gas meters)
3. Multiply this number by the calorific value* shown on your invoice in MJ/m3.
4. Multiply the result by the meter correction factor shown on your invoice.
5. Divide the result by 3.6 to obtain the number of kilowatt hours (kWh) used.
6. Multiply this number by the price per kWh rate to obtain the approximate cost of gas you have used.

* Please note that this calculation is only a guide for estimate purposes as calorific values change on a monthly basis. The amount stated on your gas bill is definitive.