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8 calculators
Car Performance Calculators
Calculate horsepower, 0-60 times, quarter-mile ET, gear ratios, tire sizes and more. Free performance and technical calculators for enthusiasts, tuners, and gearheads.
Horsepower CalculatorLive
HP from torque and RPM using the standard formula.
Tire Size CalculatorLive
Diameter difference, speedometer error, and more.
0-60 MPH EstimatorLive
Estimated 0-60 time from HP, weight, and drivetrain.
Quarter Mile CalculatorLive
Estimated ET and trap speed from HP & weight.
Braking Distance CalculatorLive
Total stopping distance at any speed and condition.
Gear Ratio CalculatorLive
Final drive ratio and RPM at any cruising speed.
Turbo Boost HP CalculatorNew
Power gain from turbo or supercharger boost.
Power-to-Weight RatioNew
HP per ton, lb per HP, and a 0-60 estimate.