Therms (US) to Watt-Hours (Wh) Converter
Enter a value to instantly convert between energy units.
1 Therm (US) = 29300.1111 Watt-Hour
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
Wh = therm × 29300One US therm equals exactly 29,300 watt-hours (or 29.3 kWh). Natural gas is sold by the therm in the US, where 1 therm = 100,000 BTU. This conversion is useful when comparing gas energy to electrical energy costs.
Source: NIST SP 811, Table B.8
Frequently Asked Questions
Real-World Examples
A utility company converting 1 therm of gas to Wh for comparison with electricity — 29.3 kWh.
1 thm = 29300 Wh
A homeowner using 100 therms per month calculates 2,930,000 Wh (2930 kWh) for the comparison.
100 thm = 2930000 Wh
A heating engineer estimating 0.5 therms of gas per hour calculates 14,650 Wh/h for the analysis.
0.5 thm = 14650 Wh
A factory converting 10 therms of daily gas consumption gets 293,000 Wh (293 kWh) for the audit.
10 thm = 293000 Wh