Field Guide / Archery Gear & Setup
Front of Center (FOC)
Also called: FOC, arrow balance
How much of an arrow's weight sits forward of its middle, a number hunters tune to improve stability and penetration.
- Type
- Specs & Setup
- Formula
- (balance point minus center) divided by arrow length, times 100
- Typical range
- Often about 7 to 15 percent, and higher for some hunters
- How to measure
- Find the balance point on a ruler edge, then use the formula
- Used for
- Deer & big game, Turkey, Target practice
What it is good for
- Better arrow stability with broadheads.
- Improved penetration on big game.
- Tuning a hunting arrow.
Where it falls short
- Too much FOC can make an arrow drop faster.
- It does not replace correct spine.
- The best number varies by setup.
Tips
- Add weight at the front with a heavier point or insert.
- Test the arrow with your broadhead, not just a field point.
Works well with
- Arrow Spine: more front weight weakens the effective spine.
- Fixed-Blade Broadhead: adds front weight and steering needs.
Field notes
Forward weight keeps an arrow pointed straight, much like a dart. The balance point is measured from the nock groove, and the center is half the length.
Related guides
Numbers here are typical, not guarantees. Have a pro shop set up and tune your bow or crossbow, follow the maker's manual, and never dry-fire a bow. Legal equipment, draw weights, crossbow seasons, and broadhead rules differ by state and area; our state resources directory links to each state's official regulations. Not sure what to buy? Try our bow and crossbow wizard.