Horsepower Calculator

Elapsed Time Method

Formula: horsepower = weight / (elapsed_time / 5.825)³

This method uses the vehicle weight and the time elapsed on a quarter-mile race to estimate horsepower.





Trap-Speed Method

Formula: horsepower = weight × (speed / 234)³

This method uses the vehicle weight and the car's speed at the quarter-mile finish line to estimate horsepower.





Horsepower to Watts Conversion

Formula: watts = horsepower × 745.7

Convert horsepower to watts, the mechanical engine power is usually expressed in units of mechanical horsepower or watts.