Airsoft Muzzle Energy Calculator
Calculate BB projectile energy in Joules. Verify field legality for CQB and outdoor sites with instant limit checks based on BB weight and velocity.
About
Airsoft fields enforce strict muzzle energy limits to ensure player safety. While velocity (FPS) is the common measurement, energy (Joules) is the true determinant of impact force. A heavy BB travels slower than a light one but may carry the same or more energy, potentially violating site rules. This discrepancy makes Joule calculation mandatory for chronograph testing.
This tool converts mass and velocity inputs into kinetic energy. It compares the result against standard safety limits used in the UK, EU, and US. Identifying whether a replica falls within "CQB" (Close Quarters Battle) or "DMR" (Designated Marksman Rifle) classifications prevents disqualification on game day.
Formulas
The kinetic energy (Ek) is calculated using the standard physics formula, where mass (m) is in kilograms and velocity (v) is in meters per second.
Since inputs are often in grams (g) and feet per second (FPS), conversions are applied:
Reference Data
| Classification | Limit (Joules) | Approx. FPS (0.20g) | Usage Context |
|---|---|---|---|
| CQB / Indoor | ≤ 1.14 J | 350 FPS | Strict limit for close engagement. |
| Outdoor Automatic | ≤ 1.49 J | 400 FPS | Standard assault rifle limit (US/EU). |
| DMR (Semi-Locked) | ≤ 1.88 J | 450 FPS | Mid-range support; minimum engagement distance. |
| Sniper (Bolt Action) | ≤ 2.32 J | 500 FPS | Long-range; strict engagement distance applies. |