In the automotive world, power metrics like HP, BHP, PS, and CV can be confusing due to different measurement systems across nations. Learn the distinctions and simplify comparisons with our live unit converter tool.
Text: Luca W. © Image: Gordon Murray Automotive, Cosworth ©
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Live converting tool
Our interactive tool simplifies conversions for power, torque, speed and now fuel consumption. Input your values, and get precise results effortlessly.
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Understanding HP, BHP, PS, and CV
The historical origins of HP, BHP, and PS lead back to the industrial revolution.
- CV (chevaux-vapeur or CH) and PS (Pferde Stärke), based on DIN regulations, are equivalent units representing the power required to lift a 75 kg mass by 1 meter in 1 second (735.49875 Watts).
- HP (horsepower), slightly different, involves lifting a 76 kg weight (745.3054 Watts).
- BHP (Brake Horsepower) accounts for friction losses and represents engine output without drivetrain losses.
HP = BHP - power lossesAre CV and HP the same?
No, CV (and PS) is not the same as HP. While they are close, 1 HP equals 1.01368 CV (PS).
How to convert HP to BHP?
Our tool above simplifies unit conversions. For additional details, refer to Wikipedia or find explanations in this very article.
Example: Translate the power output of a vehicle like the Alfa Romeo Giulia QV we tested (397 kW) to 532.67 HP, 526.20 BHP, and 539.77 CV/PS.
HP to WHP
WHP (Wheel Horsepower), measured at the wheels during a dyno run, reflects power transmitted to the road. Converting standard HP to WHP is complex due to driveline losses (approx. 15%). Use our approximate formula below, or opt for precise measurements with a dyno bench test.
WHP = 0.85*HP
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