Updated on 21/09/26 by Ben_OVO
Great question to ask. You may have noticed your smart meter will show your gas readings in both volume (meters cubed or m3) and kWh.
Converting m3 to kWh requires an equation which takes into account the calorific value. As this can change month to month, the calorific value we use to calculate your charges may differ slightly to the one used by your meter, which uses a set value of 39.2. As the calorific value changes so often, it's not practical for the meter to be constantly updated with it. However your monthly statements will use the up-to date calorific value that you can find online here.
Hope this helps 