Horsepower to Watts
Convert horsepower to watts instantly. 1 hp = 745.6998715823 W. Includes the exact factor, a conversion table of common values and the definition of both units.
How to convert horsepower to watts
To convert horsepower to watts, multiply by 745.6998715823. 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.
W = hp × 745.6998715823
Horsepower to Watts conversion table
The values people look up most often, rounded for reading. Use the calculator above for anything in between.
| Horsepower | Watts |
|---|---|
| 1 hp | 745.699872 W |
| 2 hp | 1,491.4 W |
| 3 hp | 2,237.1 W |
| 5 hp | 3,728.5 W |
| 10 hp | 7,457 W |
| 20 hp | 14,914 W |
| 25 hp | 18,642.5 W |
| 50 hp | 37,284.99 W |
| 100 hp | 74,569.99 W |
| 500 hp | 372,849.94 W |
| 1,000 hp | 745,699.87 W |
What is a horsepower?
Mechanical horsepower, defined as 550 foot-pounds per second.
What is a watt?
The SI unit of power: one joule per second.
The formula
W = hp × 745.6998715823
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 Horsepower to Watts
- Type the number of horsepower you want to convert.
- Read the result in watts 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 watts to horsepower page.
Horsepower to Watts — frequently asked questions
How many watts are in a horsepower?
One horsepower equals 745.6998715823 W. W = hp × 745.6998715823
What is the formula to convert horsepower to watts?
The formula is W = hp × 745.6998715823. It is an exact definition rather than an approximation, so the conversion never drifts no matter how large the number.
How do I convert watts back to horsepower?
Divide instead of multiplying: one watt is 0.0013410221 hp. 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 horsepower to watts 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