Convert Foot-pounds per Second to Horsepower
1 foot-pound per second (ft·lbf/s) equals 0.001818181818 horsepower (hp).
1 ft·lbf/s = 0.001818181818 hp
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk foot-pound per second to horsepower converter to paste a column from Excel.
How to Convert Foot-pound per Second to Horsepower
- 1 ft·lbf/s = 0.001818181818 hp
- 1 hp = 550 ft·lbf/s
- Example: convert 15 ft·lbf/s to hp: 15 ft·lbf/s = 15 × 0.001818181818 hp = 0.02727272727 hp
Reference conditions. hp: Mechanical (imperial) horsepower, 550 ft·lbf/s. Metric horsepower (PS) is about 1.4 % smaller.
Formula
hp = ft·lbf/s ÷ 550
Derivation from SI units:
- 1 ft·lbf/s = 1.3558179483314 W
- 1 hp = 550 ft·lbf/s = 745.69987158227 W
- 1 ft·lbf/s = 1.355817948331 W ÷ 745.6998715823 W per hp = 0.001818181818182 hp
Both units are defined exactly, so the factor is exact. Foot-pound per Second definition: foot-pound per second; Horsepower definition: horsepower.
Worked examples
- A reading of 100 ft·lbf/s converts to 0.1818181818 hp.
100 ft·lbf/s × 0.001818181818 = 0.1818181818 hp - A value of 1000 ft·lbf/s is 1.818181818 hp.
1000 ft·lbf/s × 0.001818181818 = 1.818181818 hp
Foot-pound per Second to Horsepower conversion table
| Foot-pounds per Second (ft·lbf/s) | Horsepower (hp) |
|---|---|
| 1 ft·lbf/s | 0.001818181818 hp |
| 10 ft·lbf/s | 0.01818181818 hp |
| 50 ft·lbf/s | 0.09090909091 hp |
| 100 ft·lbf/s | 0.1818181818 hp |
| 250 ft·lbf/s | 0.4545454545 hp |
| 550 ft·lbf/s | 1 hp |
| 1000 ft·lbf/s | 1.818181818 hp |
| 2750 ft·lbf/s | 5 hp |
| 5000 ft·lbf/s | 9.090909091 hp |
| 10000 ft·lbf/s | 18.18181818 hp |
Where it's used
Foot-pounds per Second are used for mechanics problems in US units, 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.
Foot-pound per Second to other power units
| Conversion | 1 ft·lbf/s equals |
|---|---|
| foot-pound per second to watt | 1.355817948 W |
| foot-pound per second to milliwatt | 1355.817948 mW |
| foot-pound per second to kilowatt | 0.001355817948 kW |
| foot-pound per second to megawatt | 0.000001355817948 MW |
| foot-pound per second to horsepower | 0.001818181818 hp |
| foot-pound per second to metric horsepower | 0.001843399392 PS |
| foot-pound per second to BTU per hour | 4.626242868 BTU/h |
| foot-pound per second to refrigeration ton | 0.000385520239 TR |
| foot-pound per second to kilocalorie per hour | 1.165793593 kcal/h |
Frequently asked questions
How many horsepower are in 1 foot-pound per second?
1 ft·lbf/s = 0.001818181818 hp.
How do I convert foot-pounds per second to horsepower?
Multiply the value in ft·lbf/s by 0.001818181818, or divide it by 550. For example, 15 ft·lbf/s × 0.001818181818 = 0.02727272727 hp.
Is the ft·lbf/s 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, "foot pound-force per second".
- 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 Foot-pounds per Second to Horsepower. Retrieved October 17, 2026, from https://scientificconverters.com/power/foot-pounds-per-second-to-horsepower/
IEEE
Scientific Converters, "Convert Foot-pounds per Second to Horsepower," scientificconverters.com. Accessed: Oct. 17, 2026. [Online]. Available: https://scientificconverters.com/power/foot-pounds-per-second-to-horsepower/