Kilocalories per Hour to BTU per Hour (kcal/h to BTU/h)
1 kilocalorie per hour (kcal/h) equals 3.968320719 BTU per hour (BTU/h).
1 kcal/h = 3.968320719 BTU/h
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk kilocalorie per hour to BTU per hour converter to paste a column from Excel.
How to Convert Kilocalorie per Hour to BTU per Hour
- 1 kcal/h = 3.968320719 BTU/h
- 1 BTU/h = 0.2519957611 kcal/h
- Example: convert 3000 kcal/h to BTU/h: 3000 kcal/h = 3000 × 3.968320719 BTU/h = 11904.96216 BTU/h
Reference conditions. kcal/h: Uses the International Table kilocalorie (4186.8 J), the convention in heating and HVAC: 1 kcal/h = 1.163 W.
Formula
BTU/h = kcal/h × 3.968320719328
Derivation from SI units:
- 1 kcal_IT/h = 4186.8 J ÷ 3600 s = 1.163 W (exact)
- 1 BTU/h = 1055.05585262 J ÷ 3600 s = 0.29307107 W
- 1 kcal/h = 1.163 W ÷ 0.2930710701722 W per BTU/h = 3.968320719328 BTU/h
Both units are defined exactly, so the factor is exact. Kilocalorie per Hour definition: kilocalorie per hour; BTU per Hour definition: BTU per hour.
Worked examples
- 1000 kcal/h is 3968.320719 BTU/h.
1000 kcal/h × 3.968320719 = 3968.320719 BTU/h - A 3000 kcal/h air conditioner is 11904.96216 BTU/h.
3000 kcal/h × 3.968320719 = 11904.96216 BTU/h
Kilocalorie per Hour to BTU per Hour conversion table
| Kilocalories per Hour (kcal/h) | BTU per Hour (BTU/h) |
|---|---|
| 100 kcal/h | 396.8320719 BTU/h |
| 500 kcal/h | 1984.16036 BTU/h |
| 860 kcal/h | 3412.755819 BTU/h |
| 1000 kcal/h | 3968.320719 BTU/h |
| 2000 kcal/h | 7936.641439 BTU/h |
| 5000 kcal/h | 19841.6036 BTU/h |
| 10000 kcal/h | 39683.20719 BTU/h |
| 20000 kcal/h | 79366.41439 BTU/h |
| 50000 kcal/h | 198416.036 BTU/h |
Where it's used
Heating and cooling capacities in kcal/h are converted to BTU/h for US and international equipment comparisons. 1 kcal/h is about 3.968 BTU/h.
Kilocalorie per Hour to other power units
| Conversion | 1 kcal/h equals |
|---|---|
| kilocalorie per hour to watt | 1.163 W |
| kilocalorie per hour to milliwatt | 1163 mW |
| kilocalorie per hour to kilowatt | 0.001163 kW |
| kilocalorie per hour to megawatt | 0.000001163 MW |
| kilocalorie per hour to horsepower | 0.00155960869 hp |
| kilocalorie per hour to metric horsepower | 0.001581239941 PS |
| kilocalorie per hour to BTU per hour | 3.968320719 BTU/h |
| kilocalorie per hour to refrigeration ton | 0.0003306933933 TR |
| kilocalorie per hour to foot-pound per second | 0.8577847796 ft·lbf/s |
Frequently asked questions
How many BTU/h is 1000 kcal/h?
1000 kcal/h = 3968.320719 BTU/h.
How many BTU per hour are in 1 kilocalorie per hour?
1 kcal/h = 3.968320719 BTU/h.
How do I convert kilocalories per hour to BTU per hour?
Multiply the value in kcal/h by 3.968320719. For example, 3000 kcal/h × 3.968320719 = 11904.96216 BTU/h.
Is the kcal/h to BTU/h 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, "calorie_IT" with hour.
- 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, "British thermal unit_IT per hour".
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). Kilocalories per Hour to BTU per Hour (kcal/h to BTU/h). Retrieved October 18, 2026, from https://scientificconverters.com/power/kilocalories-per-hour-to-btu-per-hour/
IEEE
Scientific Converters, "Kilocalories per Hour to BTU per Hour (kcal/h to BTU/h)," scientificconverters.com. Accessed: Oct. 18, 2026. [Online]. Available: https://scientificconverters.com/power/kilocalories-per-hour-to-btu-per-hour/