Foot Pounds of Energy Calculator
Unit Converter ▲
Unit Converter ▼
From:  To: 
The calculation of Foot Pounds of Energy (FPE) is a vital aspect in the field of ballistics, providing a quantitative measure of the kinetic energy transferred by a bullet or projectile upon impact. This value is crucial for understanding the potential damage or penetration capability of a bullet, making it an essential parameter for hunters, sport shooters, and ballistic experts.
Historical Background
The concept of measuring energy in the form of footpounds originated from the work of engineers and scientists who sought to quantify the work done by a force over a distance. In ballistics, this measure was adapted to understand the energy output of firearms and ammunition.
Calculation Formula
The formula to calculate Foot Pounds of Energy (FPE) is given by:
\[ E = \frac{M(g) \times BS^2}{450,437} \]
where:
 \(E\) is the Foot Pounds of Energy (ftlbs),
 \(M\) is the mass of the bullet in grains,
 \(BS\) is the bullet speed in feet per minute (ft/min).
This formula allows for the calculation of FPE by inputting the mass of the bullet and its speed, providing an understanding of the energy carried by the projectile.
Example Calculation
For a bullet with a mass of 100 grains traveling at a speed of 3000 ft/min, the Foot Pounds of Energy can be calculated as:
\[ E = \frac{100 \times 3000^2}{450,437} \approx 199.8 \text{ ftlbs} \]
Importance and Usage Scenarios
Foot Pounds of Energy is a critical measure in the design and selection of ammunition, offering insights into its performance for hunting, selfdefense, and target shooting. It helps in comparing the effectiveness of different bullets and calibers, guiding users in choosing the right ammunition for their specific needs.
Common FAQs

What units are used for Foot Pounds of Energy?
 The most common units are footpounds (ftlbs), which measure energy.

How do you calculate Foot Pounds of Energy?
 To calculate FPE, multiply the mass in grains by the square of the velocity in ft/min, then divide by 450,437.

Why is Foot Pounds of Energy important in ballistics?
 FPE provides a measure of the kinetic energy of a bullet, which is directly related to its potential for causing damage or penetration, making it essential for evaluating ammunition performance.
This calculator facilitates the calculation of Foot Pounds of Energy, making it easier for enthusiasts and professionals in the field of ballistics to understand and compare the kinetic energy of various projectiles.