FOC refers to the percentage of the total arrow weight that is located in front of the arrow's center point.

A higher FOC percentage means that more weight is located in the front of the arrow, which can have several benefits, such as:

1. Improved accuracy: A higher FOC can make the arrow more stable in flight, reducing the effects of crosswinds and other environmental factors that can cause the arrow to drift off course.

2. Increased penetration: A higher FOC can also increase the arrow's ability to penetrate the target by concentrating more of the arrow's mass in the front, where it can deliver more kinetic energy.

3. Flatter trajectory: Arrows with a higher FOC tend to maintain their speed and trajectory better over longer distances, resulting in a flatter trajectory and more consistent performance.

The optimal FOC percentage can vary depending on several factors, such as the type of bow and arrow, the intended use of the arrow (hunting, target shooting, etc.), and the shooter's personal preferences. However, a FOC percentage of around 10-15% is commonly recommended as a good starting point for most applications.

Calculating FOC Easily

To calculate FOC, you need to determine the total arrow weight and the balance point of the arrow. Here's a step-by-step guide:

1. Determine the total arrow weight: This includes the weight of the arrow shaft, nock, fletching, and any other components such as inserts or collars. You can use a digital scale to measure the weight of the arrow in grains.

2. Find the balance point of the arrow: This is the point on the arrow where it balances horizontally. You can find the balance point by suspending the arrow on a dowel or arrow spinner and moving your finger along the shaft until you find the spot where the arrow balances.

3. Measure the distance from the balance point to the center of the arrow: This distance is typically measured in inches. You can use a ruler or tape measure to measure the distance.

4. Calculate the FOC percentage: To calculate FOC, divide the distance from the balance point to the center of the arrow by the total arrow length, then multiply by 100 to get the percentage. For example, if the distance from the balance point to the center of the arrow is 10 inches and the total arrow length is 30 inches, the FOC percentage would be (10/30) x 100 = 33.3%.

It's important to note that FOC can be affected by other factors such as point weight, arrow length, and other components. Additionally, the optimal FOC percentage can vary depending on personal preference, shooting style, and other factors. It's recommended to experiment with different FOC percentages to find what works best for your specific setup and shooting style.

 Calculating FOC

Best FOC For Arrows

While FOC weight can vary based on personal preference, bow type, and arrow type, I can provide a general guideline for optimal FOC weight based on the combination of bow weight and arrow weight. 

Bow Weight (lbs.) Arrow Weight (grains) Optimal FOC (%)
25-35 300-350
10-12%
25-35 400-450 12-15%
25-35 500-550 15-18%
40-50
300-350 		12-15%
40-50
400-450 		15-18%
40-50
500-550 		18-20%
55-65
300-350 		15-18%
55-65
400-450 		18-20%
55-65
500-550 		20-22%
70-80
300-350 		18-20%
70-80
400-450 		20-22%
70-80
500-550 		22-25%

 

Again, it's important to note that these are general guidelines, and optimal FOC weight may vary depending on other factors such as arrow length, point weight, and personal preference. It's recommended to experiment with different FOC percentages to find what works best for your specific setup and shooting style.