Convert Kilocalories to Therms
1 kilocalorie (kcal) equals 0.00003966613703 therms (thm).
1 kcal = 0.00003966613703 thm
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk kilocalorie to therm converter to paste a column from Excel.
How to Convert Kilocalorie to Therm
- 1 kcal = 0.00003966613703 thm
- 1 thm = 25210.42065 kcal
- Example: convert 15 kcal to thm: 15 kcal = 15 × 0.00003966613703 thm = 0.0005949920554 thm
Reference conditions. kcal: Thermochemical kilocalorie (food Calorie), 4184 J exactly. 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 = kcal × 0.0000396661370264
or thm = kcal ÷ 25210.4206501
Derivation from SI units:
- 1 kcal = 1000 cal = 4184 J (exact)
- 1 thm (US) = 1.054804 × 10⁸ J (NIST SP 811)
- 1 kcal = 4184 J ÷ 105480400 J per thm = 0.0000396661370264 thm
Both units are defined exactly, so the factor is exact. Kilocalorie definition: kilocalorie; Therm definition: therm.
Worked examples
- A reading of 200 kcal converts to 0.007933227405 thm.
200 kcal × 0.00003966613703 = 0.007933227405 thm - A value of 1500 kcal is 0.05949920554 thm.
1500 kcal × 0.00003966613703 = 0.05949920554 thm
Kilocalorie to Therm conversion table
| Kilocalories (kcal) | Therms (thm) |
|---|---|
| 1 kcal | 0.00003966613703 thm |
| 50 kcal | 0.001983306851 thm |
| 100 kcal | 0.003966613703 thm |
| 150 kcal | 0.005949920554 thm |
| 200 kcal | 0.007933227405 thm |
| 250 kcal | 0.009916534257 thm |
| 300 kcal | 0.01189984111 thm |
| 500 kcal | 0.01983306851 thm |
| 1000 kcal | 0.03966613703 thm |
| 1500 kcal | 0.05949920554 thm |
| 2000 kcal | 0.07933227405 thm |
| 2500 kcal | 0.09916534257 thm |
| 3000 kcal | 0.1189984111 thm |
| 3500 kcal | 0.1388314796 thm |
Where it's used
Kilocalories are used for food and diet energy (2000 kcal reference intake), while therms appear in US and UK natural-gas bills. Both measure energy, work and heat, so the conversion is a fixed factor.
Kilocalorie to other energy units
| Conversion | 1 kcal equals |
|---|---|
| kilocalorie to joule | 4184 J |
| kilocalorie to kilojoule | 4.184 kJ |
| kilocalorie to megajoule | 0.004184 MJ |
| kilocalorie to calorie | 1000 cal |
| kilocalorie to watt-hour | 1.162222222 Wh |
| kilocalorie to kilowatt-hour | 0.001162222222 kWh |
| kilocalorie to BTU | 3.965666831 BTU |
| kilocalorie to therm | 0.00003966613703 thm |
| kilocalorie to electronvolt | 2.611447397 × 10²² eV |
| kilocalorie to foot-pound | 3085.960033 ft·lbf |
| kilocalorie to erg | 41840000000 erg |
Frequently asked questions
How many therms are in 1 kilocalorie?
1 kcal = 0.00003966613703 thm.
How do I convert kilocalories to therms?
Multiply the value in kcal by 0.00003966613703, or divide it by 25210.42065. For example, 15 kcal × 0.00003966613703 = 0.0005949920554 thm.
Is the kcal 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, "kilocalorie (thermochemical)".
- 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 Kilocalories to Therms. Retrieved October 17, 2026, from https://scientificconverters.com/energy/kilocalories-to-therms/
IEEE
Scientific Converters, "Convert Kilocalories to Therms," scientificconverters.com. Accessed: Oct. 17, 2026. [Online]. Available: https://scientificconverters.com/energy/kilocalories-to-therms/