How to convert watts to horsepower
One watt equals 0.001341 horsepower, so multiply the number of watts by 0.001341:
hp = W × 0.001341
W = hp ÷ 0.001341 (1 hp = 745.7 W)
Example: 250 W → 250 × 0.001341 = 0.335256 hp.
Going the other way, divide by 0.001341, or multiply by 745.7; the horsepower to watts converter does it for you.
Everyday values
| Watts | Horsepower | For example |
|---|---|---|
| 250 W | 0.335256 hp | an e-bike motor limit in the EU |
| 745.7 W | 1 hp | one horsepower |
| 1,000 W | 1.341 hp | one kilowatt |
| 1,500 W | 2.0115 hp | a hair dryer or kettle |
When you need this conversion
One mechanical horsepower is 745.7 W. Electric motors, from kitchen blenders to e-bikes, are rated in watts; the EU limits pedal-assist e-bike motors to 250 W continuous power.
Watt to horsepower conversion table
| W | hp | W | hp |
|---|---|---|---|
| 100 W | 0.134102 hp | 1,100 W | 1.4751 hp |
| 200 W | 0.268204 hp | 1,200 W | 1.6092 hp |
| 300 W | 0.402307 hp | 1,300 W | 1.7433 hp |
| 400 W | 0.536409 hp | 1,400 W | 1.8774 hp |
| 500 W | 0.670511 hp | 1,500 W | 2.0115 hp |
| 600 W | 0.804613 hp | 1,600 W | 2.1456 hp |
| 700 W | 0.938715 hp | 1,700 W | 2.2797 hp |
| 800 W | 1.0728 hp | 1,800 W | 2.4138 hp |
| 900 W | 1.2069 hp | 1,900 W | 2.5479 hp |
| 1,000 W | 1.341 hp | 2,000 W | 2.682 hp |
About the units
- Watt (W): one joule per second, the SI unit of power.
- Horsepower (hp): mechanical horsepower, 550 foot-pounds per second, about 745.7 W.
Both are units of power. The conversion factor comes from the exact definitions above, so the calculator is exact; results are only rounded for display (up to six significant digits).
Frequently asked questions
How many horsepower are in one watt?
One watt is 0.001341 horsepower. One horsepower is 745.7 watts.
How do I convert watts to horsepower?
Multiply the value in watts by 0.001341. To go back, divide by 0.001341.
What is 250 W in horsepower?
250 W = 0.335256 hp.
What is 745.7 W in horsepower?
745.7 W = 1 hp.
Sources
- NIST Special Publication 811 (2008), Guide for the Use of the International System of Units (SI), Appendix B: conversion factors.
- NIST Handbook 44 (2024), Appendix C: General tables of units of measurement.
Last reviewed 5 October 2026. Results are estimates; see our disclaimer.