Natural gas isn’t a single consistent mix of molecules like propane, it’s a mix of hydrocarbons and some suppliers have mixes that produce more heat than others, so that’s more valuable. A therm is about 100k BTU, so whatever amount of the gas you’re getting produces that much heat, is a therm of gas.
But, roughly, it’s about 100 cubic feet of natural gas to 1 therm.
RajDek t1_j5x4trp wrote
Reply to comment by gamertag0311 in Greater Boston, what's your last gas bill? by Miserable_Ride666
Natural gas isn’t a single consistent mix of molecules like propane, it’s a mix of hydrocarbons and some suppliers have mixes that produce more heat than others, so that’s more valuable. A therm is about 100k BTU, so whatever amount of the gas you’re getting produces that much heat, is a therm of gas.
But, roughly, it’s about 100 cubic feet of natural gas to 1 therm.