Therms (US) to BTU Converter
Enter a value to instantly convert between energy units.
1 Therm (US) = 99976.129 BTU (IT)
Key Formulas
Kilocalorie → Kilojoule
kJ = kcal × 4.184Kilojoule → Kilocalorie
kcal = kJ × 0.239006Kilowatt-Hour → Joule
J = kWh × 3600000Joule → Kilowatt-Hour
kWh = J × 2.77778e-7Formula
BTU = thm × 99976.13One US therm equals exactly 99,976.13 BTU. A therm is used exclusively in natural gas billing across North America, representing the thermal energy content of a unit volume of gas. Understanding this conversion is essential for reading utility bills, comparing gas heating to electric heating costs, and analyzing energy consumption for residential and commercial buildings.
Source: NIST SP 811, Table B.8
Frequently Asked Questions
Real-World Examples
A household's monthly natural gas bill of 1 therm = 99,976 BTU for annual heating energy calculation.
1 thm = 99976.13 BTU
Average home monthly heating (50 therms winter) = 5 million BTU, about 1.4 MWh electricity equivalent.
50 thm = 4998806.5 BTU
A small apartment's monthly usage of 10 therms = 999,761 BTU for cost analysis.
10 thm = 999761.3 BTU
Summer month low usage of 0.5 therms = 50,000 BTU for water heating only.
0.5 thm = 49988.065 BTU