Watt to Horsepower (W to hp)
Result
0.00134102209 Horsepower
Formula
hp = W × 0.00134102209
1 W = 0.00134102209 hp, and 1 hp = 745.6998716 W.
The watt is one joule per second. Mechanical horsepower is 550 foot-pound-force per second, which is 745.69987 W.
Worked examples
- 1 W × 0.00134102209 = 0.0013410221 hp
- 10 W × 0.00134102209 = 0.013410221 hp
- 100 W × 0.00134102209 = 0.13410221 hp
Common mistakes
- Horsepower comes in several sizes: mechanical (745.7 W), metric/PS (735.5 W) and electrical (746 W). Car specifications in Europe and Japan usually quote PS.
- Power (W) is a rate; energy (Wh, J) is power × time.
Watt to Horsepower table
| Watt (W) | Horsepower (hp) |
|---|---|
| 1 | 0.0013410221 |
| 2 | 0.0026820442 |
| 5 | 0.0067051104 |
| 10 | 0.013410221 |
| 20 | 0.026820442 |
| 50 | 0.067051104 |
| 100 | 0.13410221 |
| 1,000 | 1.3410221 |
The units
- Watt (W)
- A unit of power.
- Horsepower (hp)
- 1 Horsepower = 745.6998716 Watt.
Sources for these factors
- Guide for the Use of the International System of Units (SP 811), Appendix B: conversion factors — NIST
- The International System of Units (SI Brochure), 9th edition — BIPM
Last reviewed against these sources. An automated check recomputes every factor from its definition on each build. How we check accuracy