Convert Kilocalories per Hour to Horsepower
1 kilocalorie per hour (kcal/h) equals 0.00155960869 horsepower (hp).
1 kcal/h = 0.00155960869 hp
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk kilocalorie per hour to horsepower converter to paste a column from Excel.
How to Convert Kilocalorie per Hour to Horsepower
- 1 kcal/h = 0.00155960869 hp
- 1 hp = 641.186476 kcal/h
- Example: convert 15 kcal/h to hp: 15 kcal/h = 15 × 0.00155960869 hp = 0.02339413035 hp
Reference conditions. kcal/h: Uses the International Table kilocalorie (4186.8 J), the convention in heating and HVAC: 1 kcal/h = 1.163 W. hp: Mechanical (imperial) horsepower, 550 ft·lbf/s. Metric horsepower (PS) is about 1.4 % smaller.
Formula
hp = kcal/h × 0.001559608690199
or hp = kcal/h ÷ 641.1864759951
Derivation from SI units:
- 1 kcal_IT/h = 4186.8 J ÷ 3600 s = 1.163 W (exact)
- 1 hp = 550 ft·lbf/s = 745.69987158227 W
- 1 kcal/h = 1.163 W ÷ 745.6998715823 W per hp = 0.001559608690199 hp
Both units are defined exactly, so the factor is exact. Kilocalorie per Hour definition: kilocalorie per hour; Horsepower definition: horsepower.
Worked examples
- A reading of 1000 kcal/h converts to 1.55960869 hp.
1000 kcal/h × 0.00155960869 = 1.55960869 hp - A value of 10000 kcal/h is 15.5960869 hp.
10000 kcal/h × 0.00155960869 = 15.5960869 hp
Kilocalorie per Hour to Horsepower conversion table
| Kilocalories per Hour (kcal/h) | Horsepower (hp) |
|---|---|
| 100 kcal/h | 0.155960869 hp |
| 500 kcal/h | 0.7798043451 hp |
| 860 kcal/h | 1.341263474 hp |
| 1000 kcal/h | 1.55960869 hp |
| 2000 kcal/h | 3.11921738 hp |
| 5000 kcal/h | 7.798043451 hp |
| 10000 kcal/h | 15.5960869 hp |
| 20000 kcal/h | 31.1921738 hp |
| 50000 kcal/h | 77.98043451 hp |
Where it's used
Kilocalories per Hour are used for radiator and boiler ratings in older European data, while horsepower appear in car and motorcycle engine power in the US and UK. Both measure power (energy per unit time), so the conversion is a fixed factor.
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 horsepower are in 1 kilocalorie per hour?
1 kcal/h = 0.00155960869 hp.
How do I convert kilocalories per hour to horsepower?
Multiply the value in kcal/h by 0.00155960869, or divide it by 641.186476. For example, 15 kcal/h × 0.00155960869 = 0.02339413035 hp.
Is the kcal/h to hp 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, "horsepower (550 ft·lbf/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 per Hour to Horsepower. Retrieved October 17, 2026, from https://scientificconverters.com/power/kilocalories-per-hour-to-horsepower/
IEEE
Scientific Converters, "Convert Kilocalories per Hour to Horsepower," scientificconverters.com. Accessed: Oct. 17, 2026. [Online]. Available: https://scientificconverters.com/power/kilocalories-per-hour-to-horsepower/