BPI Multifamily Building Operator (MFBO) Practice Exam

A Therm in natural gas is a unit of energy defined as 100,000 BTU. So the energy content per Therm is exactly 100,000 BTU. In practice, natural gas has about 1,000 BTU per cubic foot, so a Therm corresponds to roughly 97–100 cubic feet of gas, depending on the gas’s exact composition. The other numeric options aren’t the standard definition, which is why 100,000 BTU per Therm is the correct choice.