1. What is Front of Center (FOC)?

Front of Center (FOC) is a measurement that indicates how much weight is distributed toward the front half of an arrow. It's expressed as a percentage of the total arrow length and affects arrow flight and stability.

2. How Does the Calculator Work?

The calculator uses the FOC equation:

Where:

• \( L \) — Total arrow length (inches)
• \( AMO \) — Balance point measured from nock end (inches)

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

3. Importance of FOC Calculation

Details: Proper FOC affects arrow stability, accuracy, and penetration. Most target arrows have FOC between 10-15%, while hunting arrows typically have 12-20%.

4. Using the Calculator

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

5. Frequently Asked Questions (FAQ)

Q1: What's the ideal FOC for my arrows?
A: It depends on your setup and purpose. Target shooters often prefer 10-15%, while hunters may want 12-20% for better penetration.

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

Q3: Should I include the point when measuring length?
A: Yes, measure total arrow length including point but excluding nock.

Q4: How can I adjust my FOC?
A: Add weight to front (heavier points, inserts) to increase FOC, or add weight to rear (heavier nocks) to decrease FOC.

Q5: Does FOC affect broadhead tuning?
A: Yes, proper FOC is especially important for broadhead stability and accuracy.