1. Subtract the previous meter reading (obtained from your last bill) from the current reading on your meter.
  2. Multiply the result by 2.83 to obtain the volume used in cubic metres. This step is not required for customers with a metric (m3) gas meter(s).
  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 pence 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.

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