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Horsepower to Watts Converter

Convert horsepower to watts and watts to horsepower instantly. Bidirectional power converter with formula and common values.

Horsepower to Watts: 1 hp equals 745.7 W. To convert horsepower to watts, multiply by 745.7 (W = hp × 745.7). For example, 10 hp = 7457 W.

3.5 hp = 2,610 W

W = hp × 745.7

How to Convert Horsepower to Watts

To convert from horsepower to watts, multiply the value by 745.7. The conversion is linear, meaning doubling the input doubles the output.

Conversion Formula

  • Horsepower to Watts: W = hp × 745.7
  • Watts to Horsepower: hp = W ÷ 745.7
Horsepower to Watts conversion scale — a dual ruler showing 1 hp equals 745.7 W.
Horsepower to Watts conversion scale (hp to W).

Horsepower to Watts Conversion Chart

Horsepower (hp)Watts (W)
0.174.57
0.25186.425
0.5372.85
1745.7
21491.4
32237.1
53728.5
107457
2014914
2518642.5
5037285
10074570
250186425
1000745700

Understanding the Units

What is a Horsepower?

One mechanical horsepower equals exactly 745.6998715822702 watts; one metric horsepower equals exactly 735.49875 watts.

Defined by James Watt to compare steam engines to draft horses pulling weights.

Common contexts: automotive, small engines.

What is a Watt?

The watt is the SI derived unit of power, equal to one joule per second (1 W = 1 J/s = 1 V·A).

Named after James Watt (1736–1819), the Scottish engineer whose improvements to the steam engine helped drive the Industrial Revolution.

Common contexts: electricity, mechanics, lighting.

Real-World Reference Points

Item Horsepower (hp) Watts (W)
Riding lawnmower1813422.6
Compact sedan150111855
Sports car400298280

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FAQ

How many watts are in one horsepower?

One mechanical horsepower equals approximately 745.7 watts. This is the most commonly used definition of horsepower.

Why is it called horsepower?

James Watt coined the term in the late 18th century to compare steam engine output to the work a draft horse could do. He estimated one horse could do 33,000 foot-pounds of work per minute.

Are there different types of horsepower?

Yes. Mechanical (imperial) horsepower is 745.7 W, metric horsepower (PS) is 735.499 W, and electrical horsepower is exactly 746 W. This converter uses mechanical horsepower.

How do I convert a car engine rating to watts?

Multiply the horsepower rating by 745.7. For example, a 200 hp engine produces about 149,140 watts or roughly 149.1 kW.

How many watts are in 1 horsepower?

1 hp equals 745.7 W.

How do you convert horsepower to watts?

Multiply the horsepower value by 745.7. Formula: W = hp × 745.7.

How many watts are in 5 horsepower?

5 hp = 3728.5 W.

How do you convert watts back to horsepower?

Use the inverse formula: hp = W ÷ 745.7. For example, 1 W = 0.001341 hp.

What is the difference between Horsepower and Watt?

One mechanical horsepower equals exactly 745.6998715822702 watts; one metric horsepower equals exactly 735.49875 watts. The watt is the SI derived unit of power, equal to one joule per second (1 W = 1 J/s = 1 V·A).