Horsepower to Force Calculator


About Horsepower to Force Calculator (Formula)

The Horsepower to Force Calculator is a valuable tool used in physics and engineering to convert between the units of horsepower (HP) and force, typically in pounds of force (lbf) or newtons (N). This conversion is important in various applications, especially in the automotive and aerospace industries, where understanding the relationship between engine power and the resulting force is crucial.

To understand the formula behind the Horsepower to Force Calculator, it’s essential to first grasp the basic definitions of horsepower and force:

  1. Horsepower (HP): Horsepower is a unit of power that measures the rate at which work is done or energy is transferred. In the context of engines and motors, it quantifies the power output. One horsepower is defined as the ability to do 550 foot-pounds of work per second, or approximately 745.7 watts.
  2. Force: Force is a vector quantity that represents the interaction between two objects and their ability to accelerate or deform. In the international system of units (SI), force is measured in newtons (N), while in the imperial system, it is often measured in pounds of force (lbf).

The formula to convert horsepower to force depends on whether you want the force in pounds (lbf) or newtons (N):

Force (lbf) = Horsepower (HP) x 550 / Velocity (ft/s)

Force (N) = Horsepower (HP) x 745.7 / Velocity (m/s)


  • Force (lbf) is the force in pounds.
  • Force (N) is the force in newtons.
  • Horsepower (HP) is the power output in horsepower.
  • Velocity (ft/s) or Velocity (m/s) is the velocity at which the work is done.

The velocity term is necessary because power is the rate at which work is done over time. So, to convert horsepower to force, you need to know the velocity at which the power is applied.

The Horsepower to Force Calculator simplifies these conversions, making it easier for engineers, automotive enthusiasts, and professionals working in fields like aviation and manufacturing to relate engine power to the resulting force on a vehicle or machinery. It aids in the precise assessment and design of engines and mechanical systems, ensuring they meet performance and safety requirements. Understanding this conversion is essential for optimizing vehicle performance and ensuring that engines deliver the desired output in various applications.