Enter your Calculation Method, then fill in fields like Vehicle Weight, Quarter-Mile ET, Torque, and RPM to calculate your engine's Horsepower — plus Wheel Horsepower and Estimated Quarter-Mile MPH adjusted for your Drivetrain Type.
Horsepower
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Wheel Horsepower
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Estimated Quarter-Mile MPH
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This calculator provides estimates based on commonly used formulas. Results are typically within 10-15% of actual dyno readings, but actual testing is always more accurate.
Horsepower (HP) is measured at the engine flywheel, while wheel horsepower (WHP) is what actually reaches the wheels after drivetrain losses. Typical losses are 12-18% depending on drivetrain type.
Yes, the formula is: HP = (Torque × RPM) ÷ 5,252. This is the standard engineering conversion between torque and horsepower.
Vehicle weight, aerodynamics, tire traction, gearing, driver skill, and track conditions all significantly impact quarter-mile times and trap speeds.
Heavier vehicles need more power to achieve the same acceleration. The power-to-weight ratio is crucial for performance - lighter cars will be faster with the same horsepower.
Sports cars typically have 8-12 lbs per horsepower, while economy cars range from 15-20 lbs per HP. High-performance vehicles may achieve 6-8 lbs per HP or better.