That is sort of like asking how many miles per hour does 100 horsepower equal. Ft lbs is energy, and FPS is speed. There IS a formula to calculate the energy (in foot lbs) of a bullet, but to use that, you need to know SPEED in FPS, and WEIGHT (in grains) of the bullet. A 40 grain bullet at 1000 fps is pretty weak. A 400 gr bullet at 1000 fps can drop a moose.
5675765765576576 fps or 66687768867jghhj fps
120 fps 90 fps 60 fps
600 FPS - Pellet 625 FPS - BB
450 FPS BB 400 FPS Pellets
275 fps
A shotgun slug can travel up to 8,921,823 fps and have a energy of 13,283,495 ft-lb.
FPS is the measurement of speed in feet per second. Depending on what kind of bullet you are talking about, bullets can travel as fast as 4400 fps. Here are a few examples: 9mm-about 1050 fps. .45ACP-about 900 fps. 5.56mm-about 2700-3300 fps. .50bmg-about 2900 fps.
fps
6600 fps
Depends on which loading of the cartridge- can be as slow as 2700 fps, or as high as 3700 fps.
750 fps. for BBs, 665 fps. for pellets.