1. What is Arrow FOC?

Front of Center (FOC) percentage is a measurement that describes how much of an arrow's weight is located in the front half of the arrow. It's an important factor in arrow flight stability and accuracy.

2. How Does the Calculator Work?

The calculator uses the FOC formula:

Where:

• \( A \) — Arrow balance point measurement (inches from nock end)
• \( L \) — Total arrow length (inches)

Explanation: The formula calculates what percentage of the arrow's length is in front of the center point.

3. Importance of FOC Calculation

Details: Proper FOC affects arrow flight, penetration, and accuracy. Higher FOC arrows (10-15%) are more stable but slower, while lower FOC arrows are faster but less stable.

4. Using the Calculator

Tips: Measure arrow length from nock groove to end of shaft (not including point). Measure balance point by finding where arrow balances on a narrow edge.

5. Frequently Asked Questions (FAQ)

Q1: What is a good FOC percentage?
A: Most target archers use 10-15%. Hunting arrows often use 12-20% for better penetration.

Q2: How does FOC affect arrow flight?
A: Higher FOC makes arrows more stable in flight but reduces speed. Lower FOC increases speed but may reduce stability.

Q3: How can I adjust my arrow's FOC?
A: Add weight to front (heavier points, inserts) to increase FOC. Use lighter points or add rear weight to decrease FOC.

Q4: Does FOC matter for all arrow types?
A: Yes, but the ideal range varies by arrow type and purpose (target, hunting, etc.).

Q5: Should I consider FOC when choosing arrows?
A: Absolutely. FOC is one of several important factors in arrow selection along with spine, weight, and length.