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.
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.
Formula: watts = horsepower × 745.7
Convert horsepower to watts, the mechanical engine power is usually expressed in units of mechanical horsepower or watts.