bhp to kw calculator

What is BHP and why convert it to kW?

BHP (brake horsepower) is a unit used to describe engine power, especially in automotive and mechanical contexts. It reflects the engine output measured at the crankshaft before drivetrain losses. kW (kilowatt) is an SI unit of power used in engineering, science, and most technical documents worldwide.

Converting bhp to kW is useful when comparing vehicle specs from different countries, reading equipment data sheets, sizing motors and generators, or preparing formal engineering reports that require SI units.

BHP to kW formula

The conversion factor for brake horsepower to kilowatts is:

1 bhp = 0.745699872 kW

So the formula is:

kW = bhp × 0.745699872

Example calculation

If an engine is rated at 200 bhp, the equivalent in kilowatts is:

200 × 0.745699872 = 149.1399744 kW

Rounded to 2 decimal places: 149.14 kW.

Quick reference table

BHP	kW (exact to 6 dp)	kW (rounded)
25	18.642497	18.64
50	37.284994	37.28
75	55.927491	55.93
100	74.569987	74.57
150	111.854981	111.85
200	149.139974	149.14
250	186.424968	186.42
300	223.709962	223.71

Common unit confusion: bhp vs hp vs PS

Power labels can be confusing because several “horsepower” standards are used:

• bhp (brake horsepower): common in UK-style automotive specs.
• hp (mechanical horsepower): often used in US contexts.
• PS (metric horsepower): used in parts of Europe and Asia.

These are close but not identical. If precision matters (engineering, legal docs, equipment compliance), always verify which horsepower definition is being used before conversion.

When this conversion is useful

• Comparing imported and domestic car performance ratings
• Checking dyno results against manufacturer power figures
• Converting machinery ratings for technical procurement
• Writing lab reports, theses, or standards-compliant documentation
• Energy and efficiency discussions that require SI units

Frequently asked questions

Is kW more accurate than bhp?

The units are both valid. kW is not “more accurate” by itself, but it is part of the SI system and is generally preferred in scientific and engineering communication.

Can I use this for electric motors?

Yes. If a motor is rated in horsepower, you can convert that rating to kW using the same factor. Always check whether the source is using brake horsepower, shaft horsepower, or another specific definition.

How many decimal places should I use?

For everyday comparisons, 1–2 decimal places are enough. For technical reports, use 3–6 decimal places based on your project requirements and measurement accuracy.

Final note

This bhp to kW calculator provides a fast and reliable conversion using the standard factor 0.745699872. For best results, use the exact unit definitions from your source material and match the rounding precision to your use case.