Convert BTU per Hour to Kilocalories per Hour
1 BTU per hour (BTU/h) equals 0.2519957611 kilocalories per hour (kcal/h).
1 BTU/h = 0.2519957611 kcal/h
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk BTU per hour to kilocalorie per hour converter to paste a column from Excel.
How to Convert BTU per Hour to Kilocalorie per Hour
- 1 BTU/h = 0.2519957611 kcal/h
- 1 kcal/h = 3.968320719 BTU/h
- Example: convert 15 BTU/h to kcal/h: 15 BTU/h = 15 × 0.2519957611 kcal/h = 3.779936417 kcal/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
kcal/h = BTU/h × 0.2519957611111
or kcal/h = BTU/h ÷ 3.968320719328
Derivation from SI units:
- 1 BTU/h = 1055.05585262 J ÷ 3600 s = 0.29307107 W
- 1 kcal_IT/h = 4186.8 J ÷ 3600 s = 1.163 W (exact)
- 1 BTU/h = 0.2930710701722 W ÷ 1.163 W per kcal/h = 0.2519957611111 kcal/h
Both units are defined exactly, so the factor is exact. BTU per Hour definition: BTU per hour; Kilocalorie per Hour definition: kilocalorie per hour.
Worked examples
- A reading of 9000 BTU/h converts to 2267.96185 kcal/h.
9000 BTU/h × 0.2519957611 = 2267.96185 kcal/h - A value of 36000 BTU/h is 9071.8474 kcal/h.
36000 BTU/h × 0.2519957611 = 9071.8474 kcal/h
BTU per Hour to Kilocalorie per Hour conversion table
| BTU per Hour (BTU/h) | Kilocalories per Hour (kcal/h) |
|---|---|
| 1000 BTU/h | 251.9957611 kcal/h |
| 3412 BTU/h | 859.8095369 kcal/h |
| 5000 BTU/h | 1259.978806 kcal/h |
| 6000 BTU/h | 1511.974567 kcal/h |
| 8000 BTU/h | 2015.966089 kcal/h |
| 9000 BTU/h | 2267.96185 kcal/h |
| 10000 BTU/h | 2519.957611 kcal/h |
| 12000 BTU/h | 3023.949133 kcal/h |
| 18000 BTU/h | 4535.9237 kcal/h |
| 24000 BTU/h | 6047.898267 kcal/h |
| 36000 BTU/h | 9071.8474 kcal/h |
| 48000 BTU/h | 12095.79653 kcal/h |
| 60000 BTU/h | 15119.74567 kcal/h |
| 80000 BTU/h | 20159.66089 kcal/h |
| 100000 BTU/h | 25199.57611 kcal/h |
Where it's used
BTU per Hour are used for air-conditioner and heat-pump capacity (e.g. 12 000 BTU/h), while kilocalories per hour appear in radiator and boiler ratings in older European data. Both measure power (energy per unit time), so the conversion is a fixed factor.
BTU per Hour to other power units
| Conversion | 1 BTU/h equals |
|---|---|
| BTU per hour to watt | 0.2930710702 W |
| BTU per hour to milliwatt | 293.0710702 mW |
| BTU per hour to kilowatt | 0.0002930710702 kW |
| BTU per hour to megawatt | 2.930710702 × 10⁻⁷ MW |
| BTU per hour to horsepower | 0.0003930147789 hp |
| BTU per hour to metric horsepower | 0.0003984657624 PS |
| BTU per hour to refrigeration ton | 0.00008333333333 TR |
| BTU per hour to kilocalorie per hour | 0.2519957611 kcal/h |
| BTU per hour to foot-pound per second | 0.2161581284 ft·lbf/s |
Frequently asked questions
How many kilocalories per hour are in 1 BTU per hour?
1 BTU/h = 0.2519957611 kcal/h.
How do I convert BTU per hour to kilocalories per hour?
Multiply the value in BTU/h by 0.2519957611, or divide it by 3.968320719. For example, 15 BTU/h × 0.2519957611 = 3.779936417 kcal/h.
Is the BTU/h to kcal/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, "British thermal unit_IT per 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, "calorie_IT" with 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). Convert BTU per Hour to Kilocalories per Hour. Retrieved October 17, 2026, from https://scientificconverters.com/power/btu-per-hour-to-kilocalories-per-hour/
IEEE
Scientific Converters, "Convert BTU per Hour to Kilocalories per Hour," scientificconverters.com. Accessed: Oct. 17, 2026. [Online]. Available: https://scientificconverters.com/power/btu-per-hour-to-kilocalories-per-hour/