Airsoft Velocity Calculator Max FPS Calculator Determine your velocity limit for a given energy. Select Joule Value Select a Joule value 1 Joule 1.14 Joules 1.27 Joules 1.49 Joules 1.64 Joules 1.88 Joules 2.32 Joules BB Weight (Grams) Select a BB weight 0.20 g 0.25 g 0.28 g 0.30 g 0.32 g 0.36 g 0.40 g 0.43 g 0.45 g 0.46 g 0.48 g 0.50 g Calculate Max FPS