FPS and Joules Calculator

Enter your RIF's details below and use the calculator to find out if you're safe to use your RIF.

How to use our FPS Calculator

  1. Pick your rate of fire
  2. Enter your chronograph reading
  3. Select your weight of BB
  4. Press submit to see your results
0 Joules
or 0 Meters Per Second

While the equation used to calculate the information given is accurate, this should always be used as a rough guide and never taken as fact. Chairsofters.co.uk take no responsibility for incorrect use of RIF in public by us of our calculator.