Gas is metered in kWh on UK bills but older meters and some references use therms. Enter the kilowatt-hours and this converts to therms. One therm is 29.3071 kWh.
A therm is an imperial unit of gas energy equal to 29.3071 kWh. UK gas bills moved to kWh years ago, but you may still meet therms on old paperwork or US sources. Your bill works out the kWh from the cubic feet or cubic metres your meter records, then charges the unit rate; see understanding your energy bill.
Common questions
How many kWh are in a therm?
One therm is 29.3071 kWh. So 5 therms is about 146.5 kWh, and 1,000 kWh is roughly 34.1 therms.
Why is my gas bill in kWh not therms?
UK suppliers switched to kWh to put gas and electricity in the same units. Your meter still records volume, which the bill converts to kWh using a standard calorific value.