Let's say that your bow shoots a 350 grain arrow at 300 feet per second. Knowing this, we can calculate it's kinetic energy like so:
KE = (mv^2)/456,240
KE = ((350)(300^2))/450,240
KE = 31,500,000/450,240
With all of this, we know that the kinetic energy is:
KE = 69.96 ft. lbs.
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CALCULATING KINETIC ENERGY
Power. You want all the power. But how do you get it? Two words - Kinetic Energy (KE). It's not too hard. Kinetic Energy is all about the mass and the speed of an arrow. Use those two variables to calculate your kinetic energy output - aka how much destruction your arrow can reign. The formula to calculate KE is KE=(mv^2)/450,240, where "m" is the mass of the arrow (in grains), and "v" is the velocity of the arrow (in feet per second (fps)).