Bullet energy calculator and unit converter for weapons.

Bullet energy calculator:
- [gram (g), meter per second (m/s)] -> Joule (J)
- [grain (gr), foot per second (ft/s)] -> foot -pound (ft/P)

Two-way converter for:
- Weight: gram (g) <-> grain (gr)
- Energy: joule (J) <-> foot-pound (ft/P)
- Speed: meter per second (m/s) <-> foot per second (ft/s, fps)
- Length: centimeter (cm) <-> inch (in)
- Distance: meter (m) <-> foot (ft)
- Length: meter (m) <-> yard (yd)
- Angle: minute angle (MOA) <-> milliradian (MRAD)

Quickly and easily measure projectile energy with a calculator.
Convert units from metric to imperial, and vice versa.