⚖️ FOC Calculator
Calculate your arrow's Front of Center balance percentage — the key spec for penetration and broadhead flight.
How to use this calculator
- Measure total arrow length from nock groove to shaft end.
- Balance the complete arrow on a thin edge and mark the balance point.
- Measure from the nock groove to the balance mark and enter both numbers.
Frequently Asked Questions
What is a good FOC for hunting arrows?
10–15% is the classic recommendation for hunting; high-FOC builds run 15–20%+ for maximum penetration. Target archers often prefer 7–11% for flatter trajectory.
How do I increase my arrow FOC?
Add point weight, use brass inserts, or choose lighter nock-end components like low-profile vanes and lighter nocks.