Bullet Energy Calculator

Bullet
Weight
(grains)
Bullet
Velocity
(ft/s)
Bullet
Energy
(ft-lbs)
Power
Factor

Energy = .5 * weight * velocity^2 / (7000 * 32.174)
or
Energy = weight * velocity^2 / 450436

Weight in grains. Velocity in feet/second.
7000 grains per pound.
Acceleration due to gravity: 32.174 ft/s^2

Power Factor = weight * velocity / 1000