Convert Kilowatt-hours to Therms
1 kilowatt-hour (kWh) equals 0.03412956341 therms (thm).
1 kWh = 0.03412956341 thm
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk kilowatt-hour to therm converter to paste a column from Excel.
How to Convert Kilowatt-hour to Therm
- 1 kWh = 0.03412956341 thm
- 1 thm = 29.30011111 kWh
- Example: convert 15 kWh to thm: 15 kWh = 15 × 0.03412956341 thm = 0.5119434511 thm
Reference conditions. thm: US therm, 100 000 BTU (59 °F), 105.4804 MJ as given by NIST SP 811. The EC therm is 105.506 MJ.
Formula
thm = kWh × 0.03412956340704
or thm = kWh ÷ 29.30011111111
Derivation from SI units:
- 1 kWh = 1000 W × 3600 s = 3.6 × 10⁶ J
- 1 thm (US) = 1.054804 × 10⁸ J (NIST SP 811)
- 1 kWh = 3600000 J ÷ 105480400 J per thm = 0.03412956340704 thm
Both units are defined exactly, so the factor is exact. Kilowatt-hour definition: kilowatt-hour; Therm definition: therm.
Worked examples
- 1000 kWh is 34.12956341 thm.
1000 kWh × 0.03412956341 = 34.12956341 thm - 29.3 kWh is about 0.9999962078 thm.
29.3 kWh × 0.03412956341 = 0.9999962078 thm
Kilowatt-hour to Therm conversion table
| Kilowatt-hours (kWh) | Therms (thm) |
|---|---|
| 0.1 kWh | 0.003412956341 thm |
| 0.5 kWh | 0.0170647817 thm |
| 1 kWh | 0.03412956341 thm |
| 2 kWh | 0.06825912681 thm |
| 5 kWh | 0.170647817 thm |
| 10 kWh | 0.3412956341 thm |
| 13.5 kWh | 0.460749106 thm |
| 20 kWh | 0.6825912681 thm |
| 30 kWh | 1.023886902 thm |
| 50 kWh | 1.70647817 thm |
| 75 kWh | 2.559717256 thm |
| 100 kWh | 3.412956341 thm |
| 300 kWh | 10.23886902 thm |
| 900 kWh | 30.71660707 thm |
| 1000 kWh | 34.12956341 thm |
| 10000 kWh | 341.2956341 thm |
Where it's used
Electricity totals in kWh are converted to therms to compare heat-pump running costs with gas furnaces.
Kilowatt-hour to other energy units
| Conversion | 1 kWh equals |
|---|---|
| kilowatt-hour to joule | 3600000 J |
| kilowatt-hour to kilojoule | 3600 kJ |
| kilowatt-hour to megajoule | 3.6 MJ |
| kilowatt-hour to calorie | 860420.6501 cal |
| kilowatt-hour to kilocalorie | 860.4206501 kcal |
| kilowatt-hour to watt-hour | 1000 Wh |
| kilowatt-hour to BTU | 3412.141633 BTU |
| kilowatt-hour to therm | 0.03412956341 thm |
| kilowatt-hour to electronvolt | 2.246943267 × 10²⁵ eV |
| kilowatt-hour to foot-pound | 2655223.737 ft·lbf |
| kilowatt-hour to erg | 36000000000000 erg |
Frequently asked questions
How do I compare kWh and therm prices?
Divide the price per therm by about 29.31 to get the gas price per kWh of energy.
How many therms are in 1 kilowatt-hour?
1 kWh = 0.03412956341 thm.
How do I convert kilowatt-hours to therms?
Multiply the value in kWh by 0.03412956341, or divide it by 29.30011111. For example, 15 kWh × 0.03412956341 = 0.5119434511 thm.
Is the kWh to thm conversion exact?
Yes. Both units are defined exactly, so the ratio is exact; its decimal form does not terminate and is shown here to 10 significant figures (more with the precision selector).
Sources
- Guide for the Use of the International System of Units (SI), NIST Special Publication 811, 2008 Edition, National Institute of Standards and Technology , Appendix B.8, "kilowatt hour (kW·h)".
- Guide for the Use of the International System of Units (SI), NIST Special Publication 811, 2008 Edition, National Institute of Standards and Technology , Appendix B.8, "therm (U.S.)".
Last reviewed: . Factors are stored exactly and computed with 50-digit decimal arithmetic. See how we verify conversion factors.
Cite this page
APA
Scientific Converters. (2026, October 15). Convert Kilowatt-hours to Therms. Retrieved October 17, 2026, from https://scientificconverters.com/energy/kilowatt-hours-to-therms/
IEEE
Scientific Converters, "Convert Kilowatt-hours to Therms," scientificconverters.com. Accessed: Oct. 17, 2026. [Online]. Available: https://scientificconverters.com/energy/kilowatt-hours-to-therms/