Gas
Gas volume to billed energy
- where
- billed energy (J; the calculator shows kWh)
- consumed volume (m³)
- billing volume correction factor
- billing calorific value (J/m³; any unit you pick is converted)
Explain this equation
Turns a metered gas volume into the kWh you are billed for. Use it to check a bill or estimate energy used between two meter readings.
V is the volume consumed, taken from the difference between readings. C is the billing correction factor, which adjusts the metered volume for typical temperature and pressure at the meter; the usual UK figure is 1.02264. cv is the calorific value printed on the bill, the energy content of each cubic metre.
Volume × correction × energy per volume gives energy. The calculator works in joules and divides by 3.6 million to show kWh.
Sense check: 100 m³ at 1.02264 and 39.5 MJ/m³ is about 1122 kWh, so roughly 11.2 kWh per cubic metre. An imperial meter reading of 100 ft³ is about 2.83 m³.
Watch out: bills sometimes use a rounded 2.83 for imperial conversion, so the last digit may differ slightly. This is a billing calculation, not an appliance rating.
Enter your values to see the result.
Good to know
Use the calorific value on the bill. Imperial units are explicit. Exact SI imperial conversion is used; a bill using rounded 2.83 m³ per 100 ft³ may differ slightly. This is separate from appliance gas-rating procedures.
Sources
Results are arithmetic only. Worked examples are not recommended design settings. This library does not provide automatic gas pipe selection, live gas tightness tests, purging procedures, combustion acceptance limits, installation approval or commissioning certification. Manufacturer data and the applicable current method remain essential.