Convert Horsepower (Mechanical) to Kilowatt (hp to kW)

Power Converter

hp

kW

Value in Kilowatts = Value in Horsepower × 0.7457 Multiply the value in horsepower by the conversion factor 0.7457.

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Overview

About converting horsepower to kilowatts

Horsepower to kilowatts is the modern car-spec conversion, turning engine power ratings into the kilowatts used on European registration documents and EV specs.

One mechanical horsepower is 0.7457 kilowatts, so converting horsepower to kilowatts means multiplying by about 0.746. A 150 hp engine is 111.9 kW, and a 400 hp performance car is about 298 kW.

Electric vehicles have made kilowatts the natural unit for motor power, since the same unit describes both the motor output and the charging rate. As a result, the hp-to-kW conversion is increasingly the bridge between how engines were traditionally sold and how modern drivetrains are specified.

Practical Tips

Quick estimate: multiply hp by 0.75.
Round anchors: 100 hp ≈ 75 kW, 200 hp ≈ 149 kW.

How to Convert Horsepower to Kilowatts

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

horsepower-to-kilowatt-formula.py

# Mathematical Formula

Value in Kilowatts = Value in Horsepower × 0.7457

# Worked Example (5 hp)

5 hp × 0.7457 = 3.7285 kW

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 Kilowatt?

Kilowatt (kW)

One thousand Watts. Standard unit for electrical appliances.

Horsepower (Mechanical) to Kilowatt Conversion Table

Horsepower (Mechanical) (hp)	Kilowatt (kW)
1 hp	0.7457 kW
2 hp	1.4914 kW
3 hp	2.2371 kW
5 hp	3.7285 kW
10 hp	7.457 kW
15 hp	11.1855 kW
20 hp	14.914 kW
25 hp	18.6425 kW
50 hp	37.28499 kW
100 hp	74.56999 kW
250 hp	186.42497 kW
500 hp	372.84994 kW
1000 hp	745.69987 kW

Kilowatt to Horsepower (Mechanical) Conversion Table

Kilowatt (kW)	Horsepower (Mechanical) (hp)
1 kW	1.34102 hp
2 kW	2.68204 hp
3 kW	4.02307 hp
5 kW	6.70511 hp
10 kW	13.41022 hp
15 kW	20.11533 hp
20 kW	26.82044 hp
25 kW	33.52555 hp
50 kW	67.0511 hp
100 kW	134.10221 hp
250 kW	335.25552 hp
500 kW	670.51104 hp
1000 kW	1341.02209 hp

Questions

Frequently Asked Questions

How do I convert horsepower to kilowatts?

Multiply the value in horsepower by the conversion factor 0.7457. For example, to convert 5 horsepower to kilowatts: 5 × 0.7457 = 3.7285 kW.

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

The conversion factor is 0.7457. One horsepower (mechanical) is equal to 0.7457 kilowatts.

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

To convert kilowatts back to horsepower, multiply by 1.341022 (or divide the value by 0.7457). One kilowatt is equal to 1.341022 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 Kilowatt.