Enter the projectile mass (grains) and the projectile velocity (ft/min) into the calculator to determine the Projectile Energy. 

Projectile Energy Formula

The following equation is used to calculate the Projectile Energy. 

Ep = mp * Vp^2 / 450437


  • Where Ep is the Projectile Energy ((foot-pounds))
  • mp is the projectile mass (grains) 
  • Vp is the projectile velocity (ft/min) 

How to Calculate Projectile Energy?

The following two example problems outline the steps and information needed in order to calculate the Projectile Energy.

Example Problem #1:

  1. First, determine the projectile mass (grains). In this example, the projectile mass (grains) is measured to be 8.
  2. Next, determine the projectile velocity (ft/min). For this problem, the projectile velocity (ft/min) is calculated to be 5.
  3. Finally, calculate the Projectile Energy using the formula above: 

Ep = mp * Vp^2 / 450437

Inserting the values from above and solving the equation with the imputed values gives: 

Ep = 8 * 5^2 / 450437 = .000444 ((foot-pounds))

Example Problem #2: 

Using the same process as example problem 1, we first define the needed variables outlined by the formula. In this case, the values are provide as: 

projectile mass (grains) = 6

projectile velocity (ft/min) = 7

Entering these values into the formula or calculator above gives us: 

Ep = 6 * 7^2 / 450437 = .000652 ((foot-pounds))