FPS (foot-pound-second) is a unit of energy in the imperial system. It is defined as the work done when a force of one pound is applied over a distance of one foot.
To determine the fps (feet per second) of a projectile with 12 ft-lbs (foot-pounds) of energy, you need to consider the weight of the projectile. This calculation involves using the formula: fps = √(2 * energy / weight). A typical airgun pellet weighing 8.2 grains and fired with 12 ft-lbs of energy would travel at approximately 715 fps.
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
600 FPS - Pellet 625 FPS - BB
120 fps 90 fps 60 fps
275 fps
450 FPS BB 400 FPS Pellets
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
750 fps. for BBs, 665 fps. for pellets.