Airsoft Calculator – FPS, MPS and Joule
With Game-On's free airsoft calculator you can easily convert between FPS (feet per second), m/s (meters per second) and joules. This is useful for measuring the muzzle velocity of your airsoft gun, following club rules and ensuring you are playing safely and within legal limits.
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How to use the calculator
1. Select bullet weight in grams (usually 0.20g, 0.25g or 0.28g).
2. Enter the speed you measured in either FPS or m/s.
3. Select the correct device from the drop-down menu.
4. Press Calculate to get the result in both FPS, m/s and joules.
Why is muzzle velocity important in airsoft?
The muzzle velocity determines how much energy the bullet hits with. In airsoft, this must be kept within safe limits to avoid injuries and to comply with regulations.
Security
Always wear approved protective equipment when playing airsoft. Excessive muzzle velocity can cause injuries, especially at short distances. Many clubs have their own FPS and joule limits for different types of weapons, such as snipers, rifles and pistols.
Competition rules
In Norway, it is common to have a maximum of 1.2 joules for indoor games and 2 joules for outdoor games, but this can vary. Always check the rules where you are going to play.
Formula for calculating joules
The physical formula for calculating impact energy in joules is:
Joule = 0.5 × (ball weight in kg) × (m/s × m/s)
To convert from FPS to m/s, multiply the number by 0.3048.
Frequently asked questions
What is FPS in airsoft?
FPS stands for feet per second, and is used to measure the speed of the bullet. 328 FPS corresponds to approximately 100 m/s.
What is MPS in airsoft?
MPS stands for meters per second, and is the SI unit of speed. In Norway, mps is often used together with joule.
What is joule?
Joule is a unit of measurement for energy. It tells you how much force the bullet has on impact.
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