Convert Horsepower (Mechanical) to Watt (hp to W)

Power Converter

hp

W

Value in Watts = Value in Horsepower × 745.699872 Multiply the value in horsepower by the conversion factor 745.699872.

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Overview

About converting horsepower to watts

Horsepower to watts converts the traditional engine-power unit into the SI watt used in electrical and scientific contexts.

One mechanical horsepower is 745.7 watts, so converting horsepower to watts means multiplying by about 745.7. So a 1 hp motor is 746 W, and a 200 hp car engine is about 149,000 W, or 149 kW.

James Watt coined horsepower in the 18th century to sell steam engines by comparing them to the draft horses they replaced. Today the watt — named after Watt himself — is the standard, which is why car makers increasingly quote engine output in kilowatts even though horsepower endures in marketing.

Practical Tips

Quick estimate: multiply hp by 746, or by 0.746 to get kilowatts directly.
Beware variants: metric horsepower (PS) is 735.5 W, slightly less than mechanical hp.

How to Convert Horsepower to Watts

To convert horsepower (mechanical) to watt, we use the official conversion formulas. Below is the mathematical formula, plain-English explanation, and a worked example.

horsepower-to-watt-formula.py

# Mathematical Formula

Value in Watts = Value in Horsepower × 745.699872

# Worked Example (5 hp)

5 hp × 745.699872 = 3728.4994 W

What is a Horsepower (Mechanical)?

Horsepower (Mechanical) (hp)

A unit of power representing the work rate of a draft horse, equal to exactly 745.699872 Watts.

What is a Watt?

Watt (W)

The SI unit of power, equal to 1 Joule per second.

Horsepower (Mechanical) to Watt Conversion Table

Horsepower (Mechanical) (hp)	Watt (W)
1 hp	745.69987 W
2 hp	1491.39974 W
3 hp	2237.09962 W
5 hp	3728.49936 W
10 hp	7456.99872 W
15 hp	11185.49808 W
20 hp	14913.99744 W
25 hp	18642.4968 W
50 hp	37284.9936 W
100 hp	74569.9872 W
250 hp	186424.968 W
500 hp	372849.936 W
1000 hp	745699.872 W

Watt to Horsepower (Mechanical) Conversion Table

Watt (W)	Horsepower (Mechanical) (hp)
1 W	0.00134 hp
2 W	0.00268 hp
3 W	0.00402 hp
5 W	0.00671 hp
10 W	0.01341 hp
15 W	0.02012 hp
20 W	0.02682 hp
25 W	0.03353 hp
50 W	0.06705 hp
100 W	0.1341 hp
250 W	0.33526 hp
500 W	0.67051 hp
1000 W	1.34102 hp

Questions

Frequently Asked Questions

How do I convert horsepower to watts?

Multiply the value in horsepower by the conversion factor 745.699872. For example, to convert 5 horsepower to watts: 5 × 745.699872 = 3728.4994 W.

What is the conversion factor from horsepower (mechanical) to watt?

The conversion factor is 745.699872. One horsepower (mechanical) is equal to 745.699872 watts.

What is the reverse conversion from watt to horsepower (mechanical)?

To convert watts back to horsepower, multiply by 0.001341 (or divide the value by 745.699872). One watt is equal to 0.001341 horsepower.

How many watts are in one horsepower?

There are approximately 745.7 watts in one mechanical horsepower.

How many kilowatts is 1 horsepower?

1 mechanical horsepower is equal to approximately 0.746 kilowatts.

Convert Horsepower (Mechanical) to Watt.