This is for reference only.
The calculation used is: KE ( in Joules) = 0.5 (a half) x the mass of the BB (in kg) x the speed squared (in Meters/Second)
Here is a great chrono card. It has most of the FPS requirements enforced by different local hosts in the PNW and the most popular BB weights.
Print it, laminate it and put it in your chrono box.
If you want a link to the file … here you go. You get 2 cards on a 8 x 11 sheet of paper.
Play smart, always wear face and mouth protection.