Convert mechanical horsepower to watts

1 hp=745.7W

Use the converter below to change any mechanical horsepower value into watts instantly — with formula, conversion table, and real-world examples.

You have

Equals

745.6999

Conversion formula

Forward

watts = mechanical horsepower × 745.7

Reverse

mechanical horsepower = watts × 0.001341

Example: 10 hp × 745.7 = 7,457 W.

About both units

From

Mechanical Horsepower

Mechanical horsepower equals 745.7 watts — James Watt's 1782 definition based on horse labor. Used in US car engines, aircraft and some industrial equipment. US muscle cars quote hp; European cars usually kW or PS.

Real-world: Base Ford Mustang: ~310 hp. Lawn mower: 5 hp. Average car: 150–200 hp.

Read full mechanical horsepower reference →

Watt

The watt is the SI unit of power — 1 joule per second. Named after James Watt. Common examples: LED bulb 5–10 W, laptop 45–100 W, kettle 2000–3000 W, car engine 50,000+ W.

Real-world: LED bulb: 5–10 W. Laptop: 45 W. Kettle: 2200 W. Oven: 2000 W. Sun per m² on Earth: 1361 W/m².

Read full watt reference →

Mechanical Horsepower to Watt conversion table

Common mechanical horsepower to watts values for quick reference.

Mechanical Horsepower (hp)	Watt (W)
1 hp	745.7 W
5 hp	3,728.5 W
10 hp	7,457 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
5,000 hp	3,728,499.36 W
10,000 hp	7,456,998.72 W
50,000 hp	37,284,993.6 W

Tips & common mistakes

Quick tips

1 hp = 745.7 W = 0.7457 kW.
US car ads quote hp; European ads quote kW or PS.
Metric horsepower (PS) differs by ~1.4% — be aware.

Avoid these

Assuming hp and PS are identical — 1.4% difference.
Using horsepower for electrical devices — watts more appropriate.
Confusing horsepower at engine flywheel vs wheel (transmission losses).

Frequently asked questions

How many watts in a mechanical horsepower?

One mechanical horsepower equals 745.7 watts.

How do I convert mechanical horsepower to watts?

Multiply the mechanical horsepower value by 745.7 to get the equivalent in watts.

What is 100 mechanical horsepower in watts?

100 mechanical horsepower equals 74,569.99 watts.

Is a mechanical horsepower bigger than a watt?

Yes. 1 mechanical horsepower equals 745.7 watts, so one mechanical horsepower is larger.

How to convert mechanical horsepower to watts without a calculator?

Multiply by 745.7 for a quick estimate; use a calculator for precise results.

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