Horsepower to Watt (hp to W)
Result
745.6998716 Watt
Formula
W = hp × 745.6998716
1 hp = 745.6998716 W, and 1 W = 0.00134102209 hp.
The watt is one joule per second. Mechanical horsepower is 550 foot-pound-force per second, which is 745.69987 W.
Worked examples
- 1 hp × 745.6998716 = 745.69987 W
- 10 hp × 745.6998716 = 7,456.9987 W
- 100 hp × 745.6998716 = 74,569.987 W
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.
Horsepower to Watt table
| Horsepower (hp) | Watt (W) |
|---|---|
| 1 | 745.69987 |
| 2 | 1,491.3997 |
| 5 | 3,728.4994 |
| 10 | 7,456.9987 |
| 20 | 14,913.997 |
| 50 | 37,284.994 |
| 100 | 74,569.987 |
| 1,000 | 745,699.87 |
The units
- Horsepower (hp)
- 1 Horsepower = 745.6998716 Watt.
- Watt (W)
- A unit of power.
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