FPE Calculator

To calculate FPE (Foot Pounds of Energy), square the velocity (V), multiply it by the weight (W), and divide by 450,240.

FPE Calculator

Enter any 2 values to calculate the missing variable

Velocity

ft/s m/s mph km/h

Weight

Grains lb kg

FPE

foot-pounds joules

Calculate Reset

The FPE (Foot Pounds of Energy) Calculator is here for you to calculate the energy output of an airgun or pellet gun. In other words, it determines how much energy a projectile will have based on its velocity and weight.

For example, this calculation is essential for understanding the performance of airguns and determining their effectiveness in shooting sports or pest control. The higher the FPE, the more powerful the airgun.

Formula

$$FPE = \frac{V^2 \times W}{450240}$$

Variable	Description
FPE	Foot pounds of energy
V	Velocity of the projectile (feet per second)
W	Weight of the pellet (grains)

Solved Calculations

Example 1:
For a velocity of 600 fps and a pellet weight of 10 grains, the FPE is calculated as:

Step	Calculation
Velocity (V)	600 fps
Weight (W)	10 grains
FPE Calculation	$\frac{600^2 \times 10}{450240}$
Result	13.33 FPE

Answer: The FPE for a 600 fps velocity and 10 grain pellet is 13.33 foot pounds of energy.

Example 2:
For a velocity of 800 fps and a pellet weight of 15 grains:

Step	Calculation
Velocity (V)	800 fps
Weight (W)	15 grains
FPE Calculation	$\frac{800^2 \times 15}{450240}$
Result	21.33 FPE

Answer: The FPE for a 800 fps velocity and 15 grain pellet is 21.33 foot pounds of energy.

What is an FPE Calculator?

The FPE Calculator is an amazing tool. It is used to measure the energy of a projectile, typically for airguns, in foot-pounds of energy (FPE). This value is crucial for understanding the power behind a pellet, bullet, or arrow fired from an airgun, helping users assess its performance, trajectory, and potential lethality.

Whether you’re an airgun enthusiast, hunter, or ballistics expert, this tool provides the necessary calculation to determine how much energy your projectiles carry.

To use the FPE Calculator, you need to input the mass of the pellet or projectile and the velocity at which it travels. The calculator then computes the FPE by applying the FPE formula.

This calculation is particularly useful for determining the optimal settings for different types of airguns and ensuring that your equipment is performing at its best.

Final Words:

To put it briefly, the FPE Calculator is a valuable tool for airgun enthusiasts and professionals alike, offering precise energy measurements that are vital for safe and effective shooting, as well as enhancing overall performance.