1. What is FOC (Front of Center)?

FOC (Front of Center) is a measurement used in archery to determine the balance point of an arrow. It represents the percentage of the arrow's total weight that is located in the front half of the arrow, which affects arrow flight stability and accuracy.

2. How Does the Calculator Work?

The calculator uses the FOC formula:

Where:

• \( Front_{GT} \) — Front weight measurement in grains
• \( Total_{GT} \) — Total arrow weight in grains

Explanation: The equation calculates the percentage of the arrow's total weight that is positioned in the front section of the arrow.

3. Importance of FOC Calculation

Details: Proper FOC is crucial for optimal arrow flight, accuracy, and penetration. Most archers aim for an FOC between 10-15% for target shooting and 12-20% for hunting applications.

4. Using the Calculator

Tips: Enter the front weight and total arrow weight in grains. Both values must be positive numbers, and the front weight cannot exceed the total weight.

5. Frequently Asked Questions (FAQ)

Q1: What is the ideal FOC percentage?
A: For most archers, an FOC between 10-15% works well for target shooting, while 12-20% is preferred for hunting to improve penetration.

Q2: How do I measure front weight?
A: Front weight typically includes the point, insert, and any weight added to the front half of the arrow.

Q3: Why is FOC important for arrow performance?
A: Proper FOC helps arrows fly more consistently, improves accuracy, and enhances penetration on game animals.

Q4: Can FOC be too high?
A: Yes, excessively high FOC can make arrows unstable in flight and may require more spine to maintain proper arrow flight.

Q5: How can I adjust my arrow's FOC?
A: You can adjust FOC by changing point weight, adding insert weights, using weighted collars, or adjusting arrow length.