Convert Therms to Kilojoules
1 therm (thm) equals 105480.4 kilojoules (kJ).
1 thm = 105480.4 kJ
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk therm to kilojoule converter to paste a column from Excel.
How to Convert Therm to Kilojoule
- 1 thm = 105480.4 kJ
- 1 kJ = 0.00000948043428 thm
- Example: convert 15 thm to kJ: 15 thm = 15 × 105480.4 kJ = 1582206 kJ
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
kJ = thm × 105480.4
Derivation from SI units:
- 1 thm (US) = 1.054804 × 10⁸ J (NIST SP 811)
- 1 kJ = 10³ J
- 1 thm = 105480400 J ÷ 1000 J per kJ = 105480.4 kJ
Both units are defined exactly, so the factor is exact. Therm definition: therm; Kilojoule definition: kilojoule.
Worked examples
- A reading of 20 thm converts to 2109608 kJ.
20 thm × 105480.4 = 2109608 kJ - A value of 100 thm is 10548040 kJ.
100 thm × 105480.4 = 10548040 kJ
Therm to Kilojoule conversion table
| Therms (thm) | Kilojoules (kJ) |
|---|---|
| 1 thm | 105480.4 kJ |
| 5 thm | 527402 kJ |
| 10 thm | 1054804 kJ |
| 20 thm | 2109608 kJ |
| 50 thm | 5274020 kJ |
| 75 thm | 7911030 kJ |
| 100 thm | 10548040 kJ |
| 500 thm | 52740200 kJ |
| 1000 thm | 105480400 kJ |
Where it's used
Therms are used for US and UK natural-gas bills, while kilojoules appear in nutrition labels (kJ per serving). Both measure energy, work and heat, so the conversion is a fixed factor.
Therm to other energy units
| Conversion | 1 thm equals |
|---|---|
| therm to joule | 105480400 J |
| therm to kilojoule | 105480.4 kJ |
| therm to megajoule | 105.4804 MJ |
| therm to calorie | 25210420.65 cal |
| therm to kilocalorie | 25210.42065 kcal |
| therm to watt-hour | 29300.11111 Wh |
| therm to kilowatt-hour | 29.30011111 kWh |
| therm to BTU | 99976.12898 BTU |
| therm to electronvolt | 6.583568738 × 10²⁶ eV |
| therm to foot-pound | 77798350.53 ft·lbf |
| therm to erg | 1.054804 × 10¹⁵ erg |
Frequently asked questions
How many kilojoules are in 1 therm?
1 thm = 105480.4 kJ.
How do I convert therms to kilojoules?
Multiply the value in thm by 105480.4. For example, 15 thm × 105480.4 = 1582206 kJ.
Is the thm to kJ conversion exact?
Yes. Both units are defined exactly, and 1 thm is exactly 105480.4 kJ.
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, "therm (U.S.)".
- The International System of Units (SI), 9th edition (SI Brochure), Bureau International des Poids et Mesures , Table 7, SI prefixes.
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 Therms to Kilojoules. Retrieved October 17, 2026, from https://scientificconverters.com/energy/therms-to-kilojoules/
IEEE
Scientific Converters, "Convert Therms to Kilojoules," scientificconverters.com. Accessed: Oct. 17, 2026. [Online]. Available: https://scientificconverters.com/energy/therms-to-kilojoules/