Crossbow Kinetic Energy Chart
Complete KE chart for crossbow bolts by weight and speed. See which setups deliver enough energy for deer, hog, bear, and other game.
📊 Crossbow Bolt KE by Weight & Speed
Values in foot-pounds (ft-lb). Formatted as KE = (grains × fps²) ÷ 450240.
| Bolt Weight | 300 fps | 350 fps | 400 fps | 425 fps | 450 fps |
|---|---|---|---|---|---|
| 350 gr | 69.9 | 95.2 | 124.4 | 140.4 | 157.4 |
| 375 gr | 74.9 | 102.0 | 133.3 | 150.4 | 168.6 |
| 400 gr | 79.9 | 108.8 | 142.2 | 160.5 | 179.9 |
| 425 gr | 84.9 | 115.6 | 151.1 | 170.5 | 191.1 |
| 450 gr | 89.9 | 122.4 | 159.9 | 180.5 | 202.4 |
| 475 gr | 94.9 | 129.2 | 168.8 | 190.6 | 213.6 |
| 500 gr | 99.9 | 136.0 | 177.7 | 200.6 | 224.9 |
| 525 gr | 104.9 | 142.8 | 186.6 | 210.7 | 236.1 |
| 550 gr | 109.9 | 149.7 | 195.5 | 220.7 | 247.4 |
🎯 Crossbow KE Minimums by Game
| Game | Minimum KE | Recommended | Typical Setup |
|---|---|---|---|
| Small game / varmint | 25 ft-lb | 40+ ft-lb | Any crossbow at close range |
| Whitetail deer | 40 ft-lb | 65+ ft-lb | 350 gr @ 300 fps or heavier |
| Wild hog | 50 ft-lb | 75+ ft-lb | 400 gr @ 350 fps or heavier |
| Black bear | 60 ft-lb | 85+ ft-lb | 425 gr @ 380 fps or heavier |
| Elk | 65 ft-lb | 95+ ft-lb | 450 gr @ 400 fps |
| Moose / large game | 75 ft-lb | 110+ ft-lb | 475+ gr @ 400 fps |
| Dangerous game | 90 ft-lb | 130+ ft-lb | 500+ gr @ 425+ fps |
⚡ Why Crossbow KE Is Higher Than Bow KE
- Higher energy storage — crossbow limbs store significantly more energy than a compound bow at the same draw weight because of longer power stroke and higher let-off design.
- Faster bolt speeds — 400+ fps is common in modern crossbows; compound bows max out around 340 fps.
- Heavier bolts — crossbow bolts are typically 400–500 gr, versus 350–450 gr for compound arrows.
- Combined effect — the result is 120–180 ft-lb for modern crossbows versus 65–85 ft-lb for compound bows.
❓ Frequently Asked Questions
How much kinetic energy does a crossbow have?
Modern crossbows typically produce 100–180 ft-lb of KE. A 400 grain bolt at 400 fps produces 142 ft-lb. High-end crossbows at 450 fps with 400 grain bolts produce 180 ft-lb.
Is a crossbow more powerful than a compound bow?
Yes. Crossbows typically deliver 100–180 ft-lb of KE, while compound bows deliver 60–90 ft-lb. The crossbow's advantage comes from higher stored energy and heavier projectiles.
How much KE do I need for deer with a crossbow?
Minimum 40 ft-lb, recommended 65+ ft-lb. Virtually every crossbow on the market exceeds these thresholds, so KE is not usually the limiting factor for deer hunting.
Does heavier bolt weight increase KE?
Yes, up to a point. Adding bolt weight increases KE slightly on a crossbow because the crossbow can push a heavier bolt without as much speed loss as a compound bow. A 400 grain bolt at 400 fps produces 142 ft-lb; a 500 grain bolt at 375 fps produces 156 ft-lb.
What is the KE of a 150 lb crossbow?
A 150 lb crossbow typically produces 60–80 ft-lb KE with a 400 grain bolt at 260–300 fps. This is sufficient for deer but below recommendations for elk.
Does KE drop at distance with crossbows?
Yes, but slowly. A crossbow bolt retains about 90% of its KE at 40 yards because of its high ballistic coefficient. Compound arrows typically retain about 80% at the same distance.