Bullet Energy Calculator
Calculate the kinetic energy of a bullet based on its mass and velocity. Ideal for shooters, hunters, and ballistics enthusiasts.
Published by:
isCalculator Editorial Team
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How to use this tool?
How to Use the Bullet Energy Calculator
- Enter Bullet Mass – Type the bullet weight in grains (e.g., 115 for 9mm).
- Enter Velocity – Type the bullet speed in feet per second (fps) (e.g., 1200).
- Click "Calculate Energy" – The result shows kinetic energy in ft-lbf.
- Read the Output – The energy value appears with the formula used:
E = (m × v²) / 450240.
Note: Both inputs must be positive numbers. The calculator uses imperial units (grains and fps). If you see an error, check that your entries are valid numbers greater than zero.
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Frequently Asked Questions
Bullet energy is the kinetic energy a bullet carries, calculated from its mass and velocity. It's important for understanding stopping power and terminal ballistics.
The formula used is E = (m * v^2) / 450240, where m is bullet mass in grains and v is velocity in feet per second. The result is in foot-pounds (ft-lbf).
Mass is in grains (gr) and velocity in feet per second (fps). The result is in foot-pounds (ft-lbf).