My friends over at Archer Air Rifles has a free Air Gun FPE Calculator.

All that is required is that you have the velocity or Feet Per Second for your air gun, with a given pellet, the weight of that pellet in Grains, and the calculator will automatically calculate you FPE or Foot Pounds of Energy.

Awesome stuff.

Also, here’s copy of that calculator:

Air Gun FPE Calculator

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