1. What is Arrow FOC?

FOC (Front of Center) is a measurement that indicates the balance point of an arrow relative to its total length. It's expressed as a percentage and helps archers understand how the weight is distributed along the arrow shaft.

2. How Does the Calculator Work?

The calculator uses the FOC formula:

Where:

• \( A \) — Arrow balance point measurement (in inches)
• \( B \) — Arrow total length (in inches)

Explanation: The formula calculates how far forward the balance point is from the center of the arrow, expressed as a percentage of the total arrow length.

3. Importance of FOC Calculation

Details: Proper FOC affects arrow flight, accuracy, and penetration. Higher FOC percentages typically provide better flight stability and penetration, while lower FOC may offer faster arrow speeds.

4. Using the Calculator

Tips: Measure the arrow balance point (A) and total arrow length (B) accurately in inches. Enter both values as positive numbers for accurate FOC calculation.

5. Frequently Asked Questions (FAQ)

Q1: What is an ideal FOC percentage for arrows?
A: Most archers prefer FOC between 10-15% for target shooting and 12-20% for hunting, but optimal FOC depends on arrow type and shooting style.

Q2: How does FOC affect arrow performance?
A: Higher FOC provides better stability and penetration but may reduce speed. Lower FOC increases speed but may sacrifice stability and accuracy.

Q3: How do I measure the balance point accurately?
A: Balance the arrow on a narrow edge or use a specialized arrow balancing tool to find the exact point where the arrow balances level.

Q4: Can FOC be adjusted after arrow construction?
A: Yes, FOC can be adjusted by adding weight to the front (inserts, points) or back (nocks, fletching) of the arrow, or by changing arrow length.

Q5: Does arrow material affect FOC calculations?
A: The FOC formula works for all arrow materials (aluminum, carbon, wood) as it only considers the physical balance point and total length.