Airsoft Joule FPS Converter

Joule / FPS converter for airsoft replicas: simple, precise calculation

Want to know the real power of your airsoft replica?

With our online Joule/FPS converter, you can instantly calculate the kinetic energy of your 6mm airsoft ball (in joules) from its speed (FPS - Feet Per Second), or do the reverse operation to obtain speed from power.

How to use the converter

Enter the weight of your ball (in grams), usually 0.20g, 0.25g, 0.28g, etc
Enter the output speed measured by the chronograph (in FPS)
The converter will immediately display the power in joules or the corresponding speed

This calculation takes into account standard airsoft parameters and applies to all replica types: AEG, GBB, GBBR, spring sniper, HPA, etc.

Conversion mode

FPS

Ball mass

Why calculate the power of your replica?

For airsoft replicas, it's very important to know their power before use, to comply with current legal regulations.

In France, an airsoft replica must not exceed 2 joules to be considered as such
It is imperative to respect the power limits set by associations on their airsoft fields
Respecting power limits is a matter of safety for players, to avoid injuries or incidents
Some upgrades and specific settings require precise adjustment of the airsoft replica's velocity with a predefined ball weight

Best practices not to be underestimated

Use a reliable measuring tool (Chronograph)
Make sure the chronograph is set to the correct ball weight.
Use several balls of the same weight to refine results
Repeat the measurement after each modification to your airsoft replica