## About FPE Calculator (Formula)

The Foot-Pound Energy (FPE) formula is used to calculate the energy of a projectile in terms of foot-pounds (ft-lbs). FPE is a measure of the amount of kinetic energy that a projectile has, which is the energy that it possesses due to its motion.

The formula for calculating FPE is typically:

**FPE = V^2 * W / 450240**

Where:

- V is the velocity of the projectile in ft/s
- W is the weight of the projectile in grains
- 450240 is the conversion factor used to express the energy in foot-pounds.

FPE is an important measure in fields such as ballistics, hunting and shooting sports. A higher FPE indicates that the projectile has more kinetic energy and can deliver more damage upon impact.

Factors that can affect FPE include the velocity, weight, and aerodynamics of the projectile, as well as the density of the air through which the projectile is travelling.

Some factors that could affect the accuracy of FPE calculation are temperature, atmospheric pressure, altitude, etc.

It’s important to note that the formula above is a basic one and there are other factors that can affect the FPE calculation.

A more accurate FPE calculation should consider the type of projectile, the caliber, the ballistic coefficient and the drag coefficient.

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