Arrow FOC — Front of Center
FOC% measures how much weight is forward of the arrow's midpoint. Ideal: 7-15% hunting, 10-15% target, 11-16% Olympic. Higher FOC improves penetration and wind stability but reduces speed.
Why This Stat Matters
Why: FOC affects arrow flight stability. Too low (<7%) reduces penetration; too high (>20%) causes tuning issues. Easton and Gold Tip recommend 10-15% for target, 7-15% for hunting.
How: Measure balance point from nock groove to where the arrow balances. FOC% = (balance_point - arrow_length/2) / arrow_length × 100. Use 100+ grain points for ideal FOC.
- ●7-15% hunting; 10-15% target; 11-16% Olympic
- ●100+ grain points common for ideal FOC
- ●FOC above 20% can cause tuning difficulties
📋 Quick Examples — Click to Load
📊 FOC by Category
Your FOC vs recommended ranges
📈 FOC Ranges
Ideal range 7-15%
🍩 FOC Guidelines
Key FOC categories
📊 FOC Comparison
Penetration vs stability by range
⚠️For educational and informational purposes only. Verify with a qualified professional.
🏅 Sports Records
FOC affects arrow flight stability—higher FOC improves consistency in wind
Higher FOC = better penetration but slower arrow speed
Easton recommends 10-15% FOC for target archery
Olympic archers typically use 11-16% FOC
Arrow FOC (Front of Center) measures how much weight is forward of the arrow's midpoint. Formula: FOC% = (balance_point - arrow_length/2) / arrow_length × 100. Ideal FOC is 7-15% for hunting and 10-15% for target archery. Olympic archers use 11-16%. Higher FOC improves penetration and wind stability but reduces speed. Easton and Gold Tip recommend 100+ grain points for optimal FOC.
Sources: Archery Trade Association, Easton Archery, Gold Tip.
Key Takeaways
- • FOC affects arrow flight stability; higher FOC = better penetration but slower arrow.
- • Easton recommends 10-15% for target archery; hunting typically 7-15%.
- • Olympic archers use 11-16% FOC for consistency in competition.
- • 100+ grain points help achieve ideal FOC; heavier points increase FOC.
Did You Know?
How Does Arrow FOC Work?
Formula
FOC% = (balance_point - arrow_length/2) / arrow_length × 100. Balance point is measured from the nock groove to where the arrow balances on a narrow edge.
Hunting vs Target
Hunting: 7-15% for penetration and wind resistance. Target: 10-15% for consistency. Olympic: 11-16% for elite performance.
Point Weight
Heavier points (100-150 gr) shift the balance forward and increase FOC. Lighter points reduce FOC and increase speed.
Expert Tips
FOC Range Comparison
| FOC Range | Use Case | Notes |
|---|---|---|
| <7% | Low | Add point weight |
| 7-15% | Hunting | Ideal penetration |
| 10-15% | Target | Easton recommended |
| 11-16% | Olympic | Elite consistency |
| >20% | High | Tuning issues |
Frequently Asked Questions
What is arrow FOC (Front of Center)?
FOC% measures how much of the arrow's total weight is in the front half. Formula: FOC% = (balance_point - arrow_length/2) / arrow_length × 100. Higher FOC improves penetration and stability but can reduce speed. Easton recommends 10-15% for target archery.
What is the ideal FOC for hunting vs target?
Hunting: 7-15% FOC for better penetration and wind resistance. Target: 10-15% FOC for consistency. Olympic archers typically use 11-16% FOC. Too low (<7%) reduces stability; too high (>20%) can make tuning difficult.
How does FOC affect arrow flight?
Higher FOC = more weight forward, better penetration, slower arrow, more stable in wind. Lower FOC = faster arrow, less penetration, more susceptible to wind. FOC affects dynamic spine and how the arrow flexes during release.
What point weight should I use for 100+ grain FOC?
100+ grain points are common for hunting to achieve 10-15% FOC. Heavier points (125-150 gr) increase FOC but reduce speed. Easton and Gold Tip provide point weight recommendations for each shaft size.
Can FOC be too high?
Yes. FOC above 20% can cause tuning issues, reduce arrow speed significantly, and make the arrow feel "nose-heavy." Most archers find 7-15% optimal. Experiment within that range based on your bow and shooting style.
How do I measure my arrow balance point?
Balance the arrow on a narrow edge (ruler, dowel) and measure from the nock groove to the balance point. Subtract half the total arrow length, divide by arrow length, multiply by 100 for FOC%. Use a FOC scale for precision.
Key Statistics
Official Data Sources
⚠️ Disclaimer: This calculator is for educational purposes only. FOC recommendations vary by bow, arrow spine, and shooting style. Consult a qualified archery pro for tuning advice. Not professional archery advice.