How to convert horsepower to watts
To convert horsepower to watts, multiply by 745.699871582. Power conversions compare engines, motors, appliances, solar panels and air conditioners.
Horsepower to Watt conversion table
| Horsepower (hp) | Watt (W) |
|---|---|
| 0.1 hp | 74.5699871582 W |
| 0.5 hp | 372.849935791 W |
| 1 hp | 745.699871582 W |
| 2 hp | 1,491.39974316 W |
| 3 hp | 2,237.09961475 W |
| 4 hp | 2,982.79948633 W |
| 5 hp | 3,728.49935791 W |
| 10 hp | 7,456.99871582 W |
| 20 hp | 14,913.9974316 W |
| 25 hp | 18,642.4967896 W |
| 50 hp | 37,284.9935791 W |
| 100 hp | 74,569.9871582 W |
| 500 hp | 372,849.935791 W |
| 1,000 hp | 745,699.871582 W |
About the units
Horsepower (hp)
Mechanical horsepower is 550 foot-pounds per second, about 745.7 watts.
Watt (W)
The watt is the SI unit of power, one joule per second.
How to use this converter
- Type the number of horsepower (hp) in the input box.
- The result in watts appears instantly — no button needed.
- See the same value in every other power unit just below.
- Use “Swap units” to convert watts back to horsepower.
When you’ll use the horsepower to watt conversion
Converting horsepower to watts comes up more often than you might expect — for example when choosing an air conditioner by BTU/h, comparing engines in hp and kW, or sizing a generator or inverter. Type your number once and you get the exact answer plus every related unit, so you don’t need to convert twice.
💡 For a quick estimate in your head, multiply by about 750 (the exact factor is 745.699871582).
Watch out for these mix-ups
- Mechanical and metric horsepower differ slightly (745.7 W vs 735.5 W).
- Confusing power (W) with energy used over time (Wh).
Tips for better results
- Double-check which system a unit belongs to (for example US vs UK gallons).
- Use the swap button to convert in the opposite direction instantly.
- Bookmark the conversions you use most — each pair has its own page.
Frequently asked questions
How many watts are in one horsepower?
One horsepower equals 745.699871582 watts. 745.699871582 is the exact factor used by this converter.
How do I convert horsepower to watts?
Multiply the value in horsepower by 745.699871582. To go the other way, multiply watts by 0.0013410220896.
What is 10 hp in W?
10 hp = 7,456.99871582 W. Also, 5 hp = 3,728.49935791 W and 100 hp = 74,569.9871582 W.
What is the difference between a horsepower and a watt?
Mechanical horsepower is 550 foot-pounds per second, about 745.7 watts. The watt is the SI unit of power, one joule per second.
Is this tool free and private?
Yes — the Horsepower to Watt is completely free with no sign-up, and it runs entirely in your browser, so the values you enter are never uploaded to our servers.
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