Airgun Energy Calculator

This Airgun Energy Calculator is a simple widget designed to take the velocity of a projectile (bb, pellet, dart or bullet), its weight in grains, and calculate the foot pounds of energy (fpe) at the muzzle. This is a useful measurement in that you can use it to compare power settings of an airgun, the energy difference of swapping out a lighter or heavier projectile, or changes in velocity.

How to measure an airgun velocity

To measure an airgun velocity you'll need to borrow or purchase a Chronograph. Most Chronographs have two sensors you shoot over so that the Chronograph can measure the elapsed time a projectile takes to pass over the first sensor and then the second sensor.

To get the most performance out of an airgun it is important to measure the velocity and weight of the pellet to be able to understand the Foot Pounds of Energy.

Airgun Calculation Definitions

FPS

FPS is an abbreviation for the measurement of Feet Per Second measurement.

Airgun Projectile Weight

In the US, pellets, bbs and bullets for airguns and firearms are typically measured in Grains.

FPE

FPE is an abbreviation of Foot Pounds of Energy. It gives a relative measurement of power derived from the FPS and weight of the projectile..

Fun calculations to try

Find the average speed of a baseball fastball and the weight of the baseball to find the energy the catcher is receiving.

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