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) 

To calculate the projectile energy, multiply the projectile mass by the projectile velocity squared.

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))