Watts to Horsepower
Convert watts to horsepower instantly. 1 W = 0.0013410221 hp. Includes the exact factor, a conversion table of common values and the definition of both units.
How to convert watts to horsepower
To convert watts to horsepower, divide by 745.6998715823 (multiply by 0.0013410221). The relationship is fixed, so the same factor works for any quantity — there is nothing to look up and nothing that changes with temperature, location or context.
hp = W × 0.0013410221
Watts to Horsepower conversion table
The values people look up most often, rounded for reading. Use the calculator above for anything in between.
| Watts | Horsepower |
|---|---|
| 1 W | 0.001341 hp |
| 2 W | 0.002682 hp |
| 3 W | 0.004023 hp |
| 5 W | 0.006705 hp |
| 10 W | 0.01341 hp |
| 20 W | 0.02682 hp |
| 25 W | 0.033526 hp |
| 50 W | 0.067051 hp |
| 100 W | 0.134102 hp |
| 500 W | 0.670511 hp |
| 1,000 W | 1.341022 hp |
What is a watt?
The SI unit of power: one joule per second.
What is a horsepower?
Mechanical horsepower, defined as 550 foot-pounds per second.
The formula
hp = W × 0.0013410221
Every result on this page comes from this formula. Nothing is rounded until the final display, so figures match a spreadsheet to the cent.
How to use the Watts to Horsepower
- Type the number of watts you want to convert.
- Read the result in horsepower straight away — there is no button to press.
- Check the table below for the values that come up most often, or reverse the conversion with the linked horsepower to watts page.
Watts to Horsepower — frequently asked questions
How many horsepower are in a watt?
One watt equals 0.0013410221 hp. hp = W × 0.0013410221
What is the formula to convert watts to horsepower?
The formula is hp = W × 0.0013410221. It is an exact definition rather than an approximation, so the conversion never drifts no matter how large the number.
How do I convert horsepower back to watts?
Divide instead of multiplying: one horsepower is 745.6998715823 W. The reverse converter is linked in the related tools list.
Is this conversion exact?
Yes. Both units are defined against the same base unit by international agreement, so the factor is exact — any rounding you see is only in the display, which you can widen by entering more decimal places.
Is this watts to horsepower free to use?
Yes. Every calculator on the site is free, needs no sign-up, and runs entirely in your browser, so your figures never leave your device.
What people search for
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About this calculator
Written and reviewed by The Samsung Calculator editorial team. Every calculator is written against a published formula, reviewed against at least one independent reference implementation, and dated when it changes.
Last reviewed August 19, 2026 · Calculation runs client-side · No data collected · Report an error