Bullet Energy Calculator
Calculate bullet energy from entered performance or equipment data.
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What this tool does
Calculate bullet energy from entered performance or equipment data. Physics calculation only; does not evaluate weapon safety, lethality or suitability.
How to use the Bullet Energy Calculator
- Enter or select projectile weight (grains).
- Enter or select velocity (feet/second).
- Read the calculated result; change any measurement to compare alternatives.
Formula
joules=0.5×grain mass×0.00006479891×(ft/s×0.3048)^2; foot-pounds=joules/1.355817948
- mass
- Projectile weight (grains)
- speed
- Velocity (feet/second)
Physics calculation only; does not evaluate weapon safety, lethality or suitability.
Worked example
For bullet energy calculator, the following measurements illustrate the exact method: Projectile weight (grains): 150; Velocity (feet/second): 2500.
Inputs
- Projectile weight (grains)150
- Velocity (feet/second)2500
Result
- Kinetic energy (joules)2,821.88
- Kinetic energy (ft-lb)2,081.31
Results explained
- Kinetic energy (joules)
- Kinetic energy (joules) from the formula above. Physics calculation only; does not evaluate weapon safety, lethality or suitability.
- Kinetic energy (ft-lb)
- Kinetic energy (ft-lb) from the formula above. Physics calculation only; does not evaluate weapon safety, lethality or suitability.
Frequently asked questions
joules=0.5×grain mass×0.00006479891×(ft/s×0.3048)^2; foot-pounds=joules/1.355817948
Physics calculation only; does not evaluate weapon safety, lethality or suitability.
No. Verify competition rules, manufacturer guidance and measured conditions before relying on the estimate.
Each field identifies its required units. Do not mix game sensitivity scales, meters and yards, or grains and grams.
No. It is an entirely local calculation with no accounts or external data requests.