To calculate the FOC (Front of Center) of an arrow, multiply the distance from the balance point to the center of the arrow by 100, and then divide by the total length of the arrow.
The Arrow FOC Calculator helps archers and hunters determine the front-of-center percentage of their arrows, which affects the balance and flight performance. FOC is an important factor in achieving accuracy and penetration. Arrows with a higher FOC will have more weight toward the front, leading to better stability and deeper penetration.
This calculator provides a simple way to ensure your arrows are optimized for hunting or target shooting by calculating the FOC based on the arrow length and balance point.
Formula:
| Variable | Description |
|---|---|
| FOC % | Front-of-Center percentage |
| AL | Balance point distance from the arrow’s tip |
| L | Total arrow length |
Solved Calculation:
Example 1:
| Step | Calculation |
|---|---|
| Arrow Length (L) | 30 inches |
| Balance Point Distance (AL) | 12 inches |
| FOC Calculation | |
| Result | 20% |
Answer: The arrow has a 20% FOC, which is ideal for many hunting applications.
Example 2:
| Step | Calculation |
|---|---|
| Arrow Length (L) | 28 inches |
| Balance Point Distance (AL) | 10 inches |
| FOC Calculation | |
| Result | 17.86% |
Answer: The arrow has a 17.86% FOC, which provides good stability in flight.
What is Arrow FOC Calculator?
The Arrow FOC (Front of Center) Calculator helps archers determine the balance point of their arrows, which is critical for optimizing performance in hunting or target shooting.
FOC refers to the percentage of the arrow’s total weight that is located in the front half of the arrow, and it affects how the arrow flies. The higher the FOC, the more stable the arrow is in flight, which is especially important for hunting larger game like elk.
The formula to calculate arrow FOC is:
FOC (%) = [(Balance Point – Arrow Length / 2) / Arrow Length] × 100
Where:
- Balance Point is the distance from the nock to the balance point of the arrow.
- Arrow Length is the total length of the arrow from nock groove to the end of the shaft.
Final Words:
For hunting, the recommended FOC generally falls between 10% and 15%, while some prefer higher FOC values like 20% for more penetration.
Tools like the Gold Tip Arrow FOC Calculator or the Easton Arrow FOC Calculator simplify the process of determining the FOC for various arrow setups. You can also use an arrow weight calculator to calculate total arrow weight, which is essential for accurate FOC calculation.
