Ball Energy Calculator (joules)

Enter the ball's weight and velocity: calculate the kinetic energy in joules, the converted velocity, and the power factor used in dynamic shooting.

How to Calculate the Energy of a Round of Ammunition

The kinetic energy of a bullet is calculated using the formula E = ½ × m × v², where m is the mass in kilograms and v is the velocity in meters per second. The result is expressed in joules (J).

• Weight conversion: 1 grain = 0.0648 grams = 0.0000648 kg.
• Speed conversion: 1 fps (feet per second) = 0.3048 m/s.
• Power factor: weight (grains) × velocity (fps) ÷ 1000.

Energy, expressed in joules, serves as a technical benchmark for comparing different types of ammunition or for verifying that a configuration complies with a discipline’s thresholds. Always check the applicable regulations and your federation’s rules, which are the sole authoritative sources.

Real-world example

A 124-grain bullet traveling at 360 m/s delivers approximately 521 joules. The same round, measured at 1,180 fps, has a power factor of approximately 146, which is classified as "Minor" under most dynamic competition rules.

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