Enter the weight (grains) and the velocity (fps) into the calculator to determine the FPE.
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- Grain To CC Calculator
FPE Formula
The following formula is used to calculate the foot-pounds energy (FPE) of a projectile.
FPE = V^2 * W / 450240
- Where FPE is the foot-pounds or energy
- V is the velocity of the projectile (ft/s)
- W is the weight of the projectile (grains)
FPE Definition
FPE is short for foot-pounds of energy. This term is used to describe the kinetic energy contained in a projectile.
Example Problem
How to calculate FPE?
- First, determine the velocity of the projectile.
For this example, the projectile is moving at 700 ft/s.
- Next, determine the weight of the projectile.
The projectile, a pellet, in this case, weighs 12.5 grains.
- Finally, calculate the FPE.
Using the formula above, the foot-pounds of energy is calculated as:
FPE = V^2 * W / 450240
FPE = 700*700&12.5/450240
FPE = 13.603
