Convert Horsepower to BTU per Hour
1 horsepower (hp) equals 2544.433578 BTU per hour (BTU/h).
1 hp = 2544.433578 BTU/h
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk horsepower to BTU per hour converter to paste a column from Excel.
How to Convert Horsepower to BTU per Hour
- 1 hp = 2544.433578 BTU/h
- 1 BTU/h = 0.0003930147789 hp
- Example: convert 15 hp to BTU/h: 15 hp = 15 × 2544.433578 BTU/h = 38166.50366 BTU/h
Reference conditions. hp: Mechanical (imperial) horsepower, 550 ft·lbf/s. Metric horsepower (PS) is about 1.4 % smaller.
Formula
BTU/h = hp × 2544.433577644
Derivation from SI units:
- 1 hp = 550 ft·lbf/s = 745.69987158227 W
- 1 BTU/h = 1055.05585262 J ÷ 3600 s = 0.29307107 W
- 1 hp = 745.6998715823 W ÷ 0.2930710701722 W per BTU/h = 2544.433577644 BTU/h
Both units are defined exactly, so the factor is exact. Horsepower definition: horsepower; BTU per Hour definition: BTU per hour.
Worked examples
- A reading of 5 hp converts to 12722.16789 BTU/h.
5 hp × 2544.433578 = 12722.16789 BTU/h - A value of 150 hp is 381665.0366 BTU/h.
150 hp × 2544.433578 = 381665.0366 BTU/h
Horsepower to BTU per Hour conversion table
| Horsepower (hp) | BTU per Hour (BTU/h) |
|---|---|
| 0.25 hp | 636.1083944 BTU/h |
| 0.5 hp | 1272.216789 BTU/h |
| 1 hp | 2544.433578 BTU/h |
| 1.5 hp | 3816.650366 BTU/h |
| 2 hp | 5088.867155 BTU/h |
| 5 hp | 12722.16789 BTU/h |
| 10 hp | 25444.33578 BTU/h |
| 25 hp | 63610.83944 BTU/h |
| 50 hp | 127221.6789 BTU/h |
| 100 hp | 254443.3578 BTU/h |
| 150 hp | 381665.0366 BTU/h |
| 200 hp | 508886.7155 BTU/h |
| 300 hp | 763330.0733 BTU/h |
| 400 hp | 1017773.431 BTU/h |
| 500 hp | 1272216.789 BTU/h |
| 1000 hp | 2544433.578 BTU/h |
Where it's used
Horsepower are used for car and motorcycle engine power in the US and UK, while BTU per hour appear in air-conditioner and heat-pump capacity (e.g. 12 000 BTU/h). Both measure power (energy per unit time), so the conversion is a fixed factor.
Horsepower to other power units
| Conversion | 1 hp equals |
|---|---|
| horsepower to watt | 745.6998716 W |
| horsepower to milliwatt | 745699.8716 mW |
| horsepower to kilowatt | 0.7456998716 kW |
| horsepower to megawatt | 0.0007456998716 MW |
| horsepower to metric horsepower | 1.013869665 PS |
| horsepower to BTU per hour | 2544.433578 BTU/h |
| horsepower to refrigeration ton | 0.2120361315 TR |
| horsepower to kilocalorie per hour | 641.186476 kcal/h |
| horsepower to foot-pound per second | 550 ft·lbf/s |
Frequently asked questions
How many BTU per hour are in 1 horsepower?
1 hp = 2544.433578 BTU/h.
How do I convert horsepower to BTU per hour?
Multiply the value in hp by 2544.433578. For example, 15 hp × 2544.433578 = 38166.50366 BTU/h.
Is the hp 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, "horsepower (550 ft·lbf/s)".
- 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). Convert Horsepower to BTU per Hour. Retrieved October 17, 2026, from https://scientificconverters.com/power/horsepower-to-btu-per-hour/
IEEE
Scientific Converters, "Convert Horsepower to BTU per Hour," scientificconverters.com. Accessed: Oct. 17, 2026. [Online]. Available: https://scientificconverters.com/power/horsepower-to-btu-per-hour/