1. What Is Front Of Center (FOC)?

Front Of Center (FOC) is a critical measurement in archery that represents the percentage of an arrow's total weight located in the front half of the arrow. It affects arrow flight stability, accuracy, and penetration.

2. How Does The Calculator Work?

The calculator uses the FOC formula:

Where:

• \( Balance Point \) — Distance from nock end to balance point (inches)
• \( Insert Length \) — Length of arrow insert (inches)
• \( Arrow Length \) — Total arrow length (inches)

Explanation: The formula calculates what percentage of the arrow's length is forward of the center balance point, indicating weight distribution.

3. Importance Of FOC Calculation

Details: Proper FOC is essential for optimal arrow flight. Higher FOC provides better stability and penetration but may sacrifice speed. Lower FOC increases speed but can reduce accuracy.

4. Using The Calculator

Tips: Measure balance point from nock end to where arrow balances. Insert length is typically 0.5-1 inch. Arrow length is total shaft length. All measurements in inches.

5. Frequently Asked Questions (FAQ)

Q1: What is the ideal FOC percentage?
A: For most target archery: 10-15%. For hunting: 12-20%. Higher FOC (15-20%) improves penetration for big game hunting.

Q2: How do I adjust FOC?
A: Increase FOC by adding heavier points/inserts or using lighter nocks/vanes. Decrease FOC by using lighter points or heavier nocks.

Q3: Why is FOC important for arrow tuning?
A: Proper FOC ensures arrows fly straight and consistently, improving grouping and reducing wind drift.

Q4: Does arrow material affect FOC?
A: Yes, different materials have different weight distributions. Carbon arrows often require more attention to FOC than aluminum.

Q5: Can FOC be too high?
A: Yes, extremely high FOC (>25%) can make arrows unstable and difficult to tune, reducing overall performance.