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FPE Calculator

Enter velocity (FPS) and weight (grains) to instantly get muzzle energy (FPE).

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Use this FPE calculator to calculate foot-pound of energy of an exiting pellet. This helps to find the force, pressure, or energy of an explosion based on the FPE formula.

What is FPE (Foot-Pounds of Energy)?

A foot-pound (ft·lb) is a unit used to measure muzzle energy. It represents the amount of kinetic energy a projectile possesses at the moment it leaves the barrel of a gun.

One foot-pound is defined as the energy required to move a one-pound object through a distance of one foot using a force of one pound.

FPE Calculation Formula:

The formula used to calculate Foot-Pounds of Energy (FPE) is:

FPE = (V)² × (W / 450240)

V = velocity of the projectile (feet per second, ft/s)
W = projectile weight (grains)

Instead of performing manual calculations, you can use an online FPE calculator. Simply enter velocity and projectile weight, and the tool will instantly compute the muzzle energy.

How to Manually Calculate FPE?

Follow these steps:

Determine the projectile weight in grains.
Measure or obtain the projectile velocity in ft/s.
Square the velocity value.
Multiply the squared velocity by the projectile weight.
Divide the result by 450240.

The final result will be expressed in Foot-Pounds of Energy (ft·lb).

Example:

Suppose the projectile weight is 12.5 grains and the velocity is 800 ft/s. Calculate the FPE.

Solution:

Given:

Weight (W) = 12.5 grains

Velocity (V) = 800 ft/s

Step 1: Square the velocity

800² = 640,000

Step 2: Multiply by weight

640,000 × 12.5 = 8,000,000

Step 3: Divide by 450240

FPE = 8,000,000 / 450240 ≈ 17.77 ft·lb

How to Use this FPE Calculator (foot-pounds of energy calculator)?

Inputs:

Enter projectile velocity (ft/s).
Enter projectile weight (grains).
Click Calculate.

Output:

Foot-Pounds of Energy (FPE)
Step-by-step calculation details

FAQs:

How Many Ft·Lbs is 800 FPS?

If an 8-grain projectile travels at 800 ft/s:

FPE = (800² × 8) / 450240

FPE = (640,000 × 8) / 450240

FPE = 5,120,000 / 450240 ≈ 11.37 ft·lb

What is Ft·Lbs of Muzzle Energy?

Muzzle energy is the kinetic energy a projectile carries as it exits the barrel of a firearm. It indicates the potential impact power of the pellet or bullet and is measured in Foot-Pounds of Energy (ft·lb).

What does FPE stand for in an air gun?

FPE (Foot-Pounds of Energy) measures the muzzle energy of an air gun pellet. It indicates total energy of the pellet carries when it leaves the barrel and is calculated using the pellet's weight and velocity.

What units are used to calculate FPE?

The unit of FPE are:

Projectile Weight = Measured in grains (gr)
Velocity = Measured in feet per second (fps or ft/s)

References:

From airgundetectives.com: Foot Pounds of Energy (FPE).
From Wikipedia: Foot-pound (energy) – usage and conversion.

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