kW to BHP Calculator
1 kilowatt = 1.34102 brake horsepower
Common kW to BHP Conversions
| Kilowatts (kW) | Brake Horsepower (BHP) | Typical context |
|---|---|---|
| 50 kW | 67.05 BHP | Small city car |
| 75 kW | 100.58 BHP | Economy hatchback |
| 100 kW | 134.10 BHP | Family saloon |
| 150 kW | 201.15 BHP | Sports hatchback |
| 200 kW | 268.20 BHP | Performance saloon |
| 300 kW | 402.31 BHP | Supercar / EV sport |
| 500 kW | 670.51 BHP | Hypercar |
What is a Kilowatt (kW)?
A kilowatt (kW) is the internationally recognised SI unit of power. One kilowatt equals 1,000 watts — the rate at which energy is transferred or converted per second. It is used as the standard across engineering disciplines worldwide, from industrial machinery and power stations to household appliances and electric vehicle drivetrains.
In automotive terms, kW measures the rate at which an engine or motor converts fuel or electrical energy into useful mechanical work at the output shaft. It is now the primary power unit on European car specification sheets and is mandatory on new vehicle listings in many markets. The higher the kW figure, the greater the engine's capacity to accelerate the vehicle or sustain high-speed operation.
What is Brake Horsepower (BHP)?
Brake horsepower (BHP) is a unit of power rooted in 19th-century engineering. The term "brake" refers to the braking dynamometer — a device clamped to the output shaft of an engine that applies a measurable resisting force, allowing engineers to calculate true power output at the crankshaft before it passes through any gearbox or drivetrain components.
One horsepower was originally defined by James Watt as the power of a horse lifting 33,000 pounds one foot in one minute — equivalent to 745.7 watts. BHP remains the dominant power unit in the UK car market. If you have ever read a British car review or looked at a UK dealer specification sheet, the power figure is almost certainly quoted in BHP. It offers a direct, consistent benchmark when comparing petrol and diesel engines across different manufacturers.
The kW to BHP Conversion Formula
The conversion between kilowatts and brake horsepower is a fixed ratio based on the precise mechanical definition of horsepower. Because both units measure the same physical quantity (power), converting between them is simply a matter of multiplying by a constant.
The factor 1.34102 is derived from the precise value of one mechanical horsepower: 1 hp = 550 ft·lbf/s = 745.69987 W. Therefore 1,000 W ÷ 745.69987 = 1.34102. This value is used universally by the Society of Automotive Engineers (SAE) and is accurate to six significant figures — more than sufficient for any real-world power comparison.
To reverse the calculation and convert BHP back to kW, divide by 1.34102. For example, 300 BHP ÷ 1.34102 = 223.71 kW. Use our BHP to kW Calculator to do this instantly.
How to Use This kW to BHP Calculator
The calculator above is designed to give you an instant, accurate result with a full calculation breakdown. Here is how to use it:
- Enter your kW value. Type the power figure in kilowatts into the input field. You can enter whole numbers (e.g. 100) or decimals (e.g. 73.5). Negative values and zero are not valid and will trigger a prompt to re-enter.
- Click Calculate — or press Enter on your keyboard. The tool instantly multiplies your value by 1.34102 and displays the result.
- Read your result. The BHP figure appears in bold, along with the full written calculation so you can see exactly how the number was reached.
- Repeat as needed. Clear the field and enter a new value to convert another figure — no page reload required.
Real-World kW to BHP Examples
Abstract numbers are easier to understand in context. Below are common kW ratings translated to BHP, with typical vehicle examples to give you a practical sense of scale:
(e.g. Volkswagen Polo 1.0)
(e.g. Ford Fiesta ST-Line)
(e.g. Honda Civic Type R)
(e.g. BMW M3 base)
(e.g. Porsche 911 Turbo S)
(e.g. Rimac Nevera)
As a quick mental rule, multiplying any kW figure by 1.34 gives a close BHP approximation — useful for on-the-spot estimates when reading spec sheets without a calculator to hand.
kW vs BHP vs PS — What Is the Difference?
Three distinct power units appear regularly in car specifications, often on the same page. Understanding what each one means — and where it is used — prevents confusion when comparing vehicles from different markets.
| Unit | Full name | Where used | = 100 kW |
|---|---|---|---|
| kW | Kilowatt | Global standard; mandatory in EU, preferred for EVs | 100 kW |
| BHP | Brake Horsepower | UK automotive market and press | 134.10 BHP |
| PS | Pferdestärke (metric hp) | Continental Europe, especially German brands | 135.96 PS |
| HP (SAE) | Horsepower (SAE net) | United States automotive market | 134.10 HP* |
* SAE HP and BHP share the same conversion factor from kW (1.34102), but are measured under different conditions. BHP testing excludes accessories such as the alternator and air filter, so a given engine may show marginally lower BHP than SAE HP in practice.
PS vs BHP is the most common source of confusion. One PS equals exactly 735.49875 W, while one BHP equals 745.69987 W — making PS roughly 1.4% smaller than BHP. In practice, 200 PS = 197.3 BHP. For general comparisons this difference is negligible, but for tuning or performance benchmarking, always confirm which unit the manufacturer is using.
kW to BHP Conversion Table
The table below covers a wide range of kilowatt values — from small engine outputs to high-performance figures — for quick reference without using the calculator:
| Kilowatts (kW) | Brake Horsepower (BHP) | Typical context |
|---|---|---|
| 10 kW | 13.41 BHP | Light electric scooter |
| 25 kW | 33.53 BHP | Small motorcycle |
| 50 kW | 67.05 BHP | Budget city car |
| 75 kW | 100.58 BHP | Economy hatchback |
| 100 kW | 134.10 BHP | Family saloon |
| 110 kW | 147.51 BHP | Compact SUV |
| 130 kW | 174.33 BHP | Sport hatchback |
| 150 kW | 201.15 BHP | Hot hatch / small EV |
| 180 kW | 241.38 BHP | Mid-size performance |
| 200 kW | 268.20 BHP | Performance saloon |
| 221 kW | 296.37 BHP | BMW M3 (base) |
| 250 kW | 335.26 BHP | Sports car |
| 300 kW | 402.31 BHP | High-performance EV |
| 400 kW | 536.41 BHP | Supercar class |
| 500 kW | 670.51 BHP | Hypercar / flagship EV |
| 750 kW | 1,005.77 BHP | Rimac Nevera class |
| 1,000 kW | 1,341.02 BHP | Top-tier track car |
Frequently Asked Questions
Is BHP the same as horsepower?
Not exactly, though they are very close. BHP (brake horsepower) and SAE HP (used in the US) share the same conversion factor from kW (1.34102), but are measured under different conditions. BHP is tested with accessories like the alternator and air filter removed, so a given engine's BHP rating may be 1–3% lower than its SAE HP figure. For casual comparison, the two can be treated as equivalent.
Why is kW becoming more common than BHP?
The growth of electric vehicles has accelerated the shift toward kW. Electric motors are rated in kilowatts by nature, because electrical power is measured in watts (voltage × current). As EVs become mainstream and EU regulations increasingly require kW on vehicle labels, the industry is gradually moving away from BHP — though it remains deeply embedded in UK car culture and motoring journalism.
What is 1 kW in BHP?
1 kW = 1.34102 BHP. This is the fundamental conversion factor. A 1 kW electric motor produces just over 1.34 BHP of mechanical output — roughly the power of a large domestic food blender at full capacity.
How do I estimate kW to BHP quickly in my head?
A reliable mental shortcut is to multiply the kW value by 1.34 — or think of it as "multiply by 4, then divide by 3". For example: 150 kW × 4 = 600, 600 ÷ 3 = 200 BHP. The precise answer is 201.15 BHP, so this rule is accurate to within 1% — useful for quick estimates on the spot.
Does more BHP always mean a faster car?
Power is only one part of the performance equation. A car's acceleration and top speed depend on power, torque, weight, gearing, traction, and aerodynamics. A lightweight 150 BHP sports car can feel noticeably quicker than a 200 BHP family SUV because of the weight difference. BHP is best used as a comparative figure between similar vehicle types, not as a universal predictor of speed.
Can I use the same formula for electric motor kW to BHP?
Yes — the formula is identical. If an electric motor is rated at 300 kW, it produces 300 × 1.34102 = 402.31 BHP equivalent. It is worth noting, however, that electric motors deliver maximum torque instantly from zero RPM, which makes them feel substantially faster than a petrol engine with a comparable BHP figure, particularly from a standing start.
What is 200 kW in BHP?
200 kW = 268.20 BHP. This is the territory of powerful executive saloons, performance estates, and many modern electric crossovers. At this level, a typical petrol car would cover 0–60 mph in around 5–6 seconds depending on weight and gearing.
How to use kW to BHP Conversion calculator?
- Enter the Power Value: Input the power in kilowatts (kW) into the provided text box.
- Click on Calculate: Press the “Calculate” button to convert the entered kW value to BHP.
- View the Result: The calculated Brake Horsepower (BHP) will appear below, along with a detailed calculation breakdown.
- Correct Errors: If an invalid or negative value is entered, an error message will prompt you to provide a valid input.
- Reset (Optional): Clear the input field and result if you wish to perform a new calculation.