🎯 Kinetic Energy & Momentum Calculator
How do you Determine kinetic energy of an arrow?
You’ll need 2 metrics to calculate kinetic energy:
1. Velocity or arrow speed (fps):
Use a chronograph or our arrow speed calculator to find yours.
2. Mass arrow weight in grain:
Use a kitchen scale to determine it. Note that the arrow weight INCLUDES shaft, nock, fleching, insert and point.
The Kenetic Energy Fomula:
KE = (m*v2)/450,800
- KE: Kenetic Energy (ft. lbs.)
- m: mass arrow weight (grains)
- v: velocity or arrow speed (fps)
Example:
If you’re shooting arrow at 280 fps and your mass arrow weight is 400 grains, then the KE = 400*280*280 /450800 = 69.65 (ft. lbs).
What is good kinetic energy for an arrow?
Check out kinetic energy recommendation for hunting game:
| Kinetic Energy | Recommendation |
|---|---|
| 15-25 ft-lbs | Small Game (rabbbit, groundhog, etc.) |
| 25-41 ft-lbs | Medium Game (deer, antelope, etc.) |
| 42-65 ft-lbs | Large Game (elk, black bear, wild boar, etc.) |
| 65-80 ft-lbs | Toughest Game (cape buffalo, grizzly, moose, etc.) |
