Quote Originally Posted by billywhizz1 View Post
On the cheap chinese ones you need a calculator to change mps -fps. i use a app on my phone called air gun calc. works very well and easy to use.
This may help.

FPS = Feet Per Second, MPS = Meters Per Second, FPE = Foot Pounds of Energy
To convert to Joules multiply FPE by 1.3558, Joules to FPE multiply by .7376
To convert MPS to FPS, MPS x 3.2808399 = FPS
To convert FPS to MPS, FPS x .3048 = MPS
FPE Formula is Pellet weight (gr) x FPS x FPS divided by 450240 or 450436.7