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Power Converter · Free, instant results with formula and a full conversion table
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To convert Horsepower to Watt: multiply by 745.7. 1 hp × 745.700 = 745.7 W
| Horsepower (hp) | Watt (W) |
|---|---|
| 0.1 hp | 74.57 W |
| 0.25 hp | 186.425 W |
| 0.5 hp | 372.85 W |
| 1 hp | 745.7 W |
| 2 hp | 1491.4 W |
| 5 hp | 3728.5 W |
| 10 hp | 7457 W |
| 20 hp | 14914 W |
| 25 hp | 18642.5 W |
| 50 hp | 37285 W |
| 100 hp | 74570 W |
| 250 hp | 186425 W |
| 500 hp | 372850 W |
| 1,000 hp | 745700 W |
Use our free horsepower to watt converter to get accurate results in under one second. This power conversion tool is essential for anyone working in automotive engineering, electric vehicles, electrical systems, and machinery specification. Simply enter your value above, click Convert, and see the result instantly with the exact formula shown. You can also reverse the conversion, copy the result, or adjust decimal precision.
The conversion formula is a single constant factor: 1 Horsepower equals 745.7 Watt. Multiply any horsepower value by 745.7 to obtain the equivalent in watt. All calculations on ConvertNow use verified constants, and the table below is computed with the same factor.
Quick estimate: multiply horsepower by 750 instead of 745.7 — within about 0.6% of the exact result.
Each example below is worked with the exact formula, step by step — so you can check the math or adapt it to your own numbers.
| Value | Working | Result |
|---|---|---|
| 0.001 hp | 0.001 hp × 745.7 = | 0.746 W |
| 0.1 hp | 0.1 hp × 745.7 = | 74.57 W |
| 100 hp | 100 hp × 745.7 = | 74,570 W |
| 10000 hp | 10000 hp × 745.7 = | 7.46 million W |
Horsepower (hp) is part of the Imperial / US Customary measurement system, while Watt (W) belongs to the SI (metric) system. The difference matters because a recipe, blueprint, or technical spec written in one system will not match measurements in the other unless converted precisely. Mixing systems without conversion can lead to comparing an EV motor in kilowatts against a gasoline engine in horsepower without converting, and undersizing a generator.
Power conversions are used every day in automotive engineering, electric vehicles, electrical systems, and machinery specification. Professionals in these fields rely on fast, accurate tools because even small rounding errors multiply across large datasets or recipes. ConvertNow keeps your workflow moving with instant results, so you never have to open a spreadsheet or do manual math.
Common mistakes when converting horsepower to watt include confusing mechanical horsepower (hp) with metric horsepower (PS), which differ by about 1.4%, and confusing power (kW) with energy (kWh) when comparing motors and batteries, and rounding too early in the calculation. Always verify the direction of the conversion and use the swap button if you need to reverse it.
The following table shows 20 common conversion values from horsepower to watt for fast reference without calculator use.
| Horsepower (hp) | Watt (W) |
|---|---|
| 0.1 | 74.57 |
| 0.25 | 186.425 |
| 0.5 | 372.85 |
| 0.75 | 559.275 |
| 1 | 745.7 |
| 2 | 1,491 |
| 3 | 2,237 |
| 5 | 3,728 |
| 10 | 7,457 |
| 15 | 11,185 |
| 20 | 14,914 |
| 25 | 18,642 |
| 50 | 37,285 |
| 75 | 55,927 |
| 100 | 74,570 |
| 150 | 111,855 |
| 200 | 149,140 |
| 250 | 186,425 |
| 300 | 223,710 |
| 500 | 372,850 |
There are 745.7 watt in 1 horsepower.
Multiply your horsepower value by 745.7. For quick mental math, you can round the factor to 745.7 when precision is not critical.
The Horsepower is the larger unit of the two: 1 Horsepower equals 745.7 Watt.
Horsepower is primarily used in the United States and car markets worldwide, for engine and motor ratings. Watt is primarily used in science, engineering and electrical ratings worldwide.
Yes. Install ConvertNow as a Progressive Web App and perform this conversion offline. If you need currency rates, an internet connection is required because those update live.
Accurate conversion prevents costly errors in automotive engineering, electric vehicles, electrical systems, and machinery specification. Using the wrong unit can lead to comparing an EV motor in kilowatts against a gasoline engine in horsepower without converting, and undersizing a generator.
Need the opposite direction? Use the Watt to Horsepower Converter to convert watt back to horsepower.
Browse every tool in this category on the Power Converter hub page.