Arrow FOC Calculator
Arrow FOC Calculator
How to find the Front of Center (FOC) for your arrow? The Arrow FOC Calculator helps you determine this with ease. Input the arrow length and balance point to find the FOC percentage. Let’s dive into understanding what the Arrow FOC Calculator is and how to use it.
What is Arrow FOC?
Arrow FOC stands for Front of Center. It is a measurement that indicates how much of the arrow’s weight is located towards the front. A higher FOC means more weight at the front, which can affect the arrow’s flight and accuracy.
How to Use FOC
Using the Arrow FOC Calculator is simple. Follow these steps:
 Enter Total Arrow Length: Input the arrow length in inches.
 Enter Distance to Balance Point: Input the distance to the balance point in inches.
 Click Calculate: Press the “Calculate FOC” button to get the result.
Example Inputs:
 Total Arrow Length: 30 inches
 Distance to Balance Point: 18 inches
Click “Calculate FOC” to see the FOC percentage.
How to Calculate Arrow FOC
The formula to calculate FOC is:
$\text{FOC} = \left( \frac{\text{Distance to Balance Point} – \left(\frac{\text{Total Arrow Length}}{2}\right)}{\text{Total Arrow Length}} \right) \times 100$
Variables:
Variable  Description 

Total Arrow Length  The length of the arrow in inches 
Distance to Balance Point  The distance from the nock to the balance point in inches 
Calculation Example 1:

Step 1: Enter the total arrow length (30 inches).

Step 2: Enter the distance to the balance point (18 inches).

Step 3: Apply the formula.
$\text{FOC} = \left( \frac{18 – \left(\frac{30}{2}\right)}{30} \right) \times 100$ 
Step 4: Simplify inside the parentheses.
$\text{FOC} = \left( \frac{18 – 15}{30} \right) \times 100$ 
Step 5: Perform the subtraction.
$\text{FOC} = \left( \frac{3}{30} \right) \times 100$ 
Step 6: Divide and multiply by 100.
$\text{FOC} = 0.1 \times 100 = 10\%$
The FOC percentage is 10%.
Calculation Example 2:

Step 1: Enter the total arrow length (28 inches).

Step 2: Enter the distance to the balance point (16 inches).

Step 3: Apply the formula.
$\text{FOC} = \left( \frac{16 – \left(\frac{28}{2}\right)}{28} \right) \times 100$ 
Step 4: Simplify inside the parentheses.
$\text{FOC} = \left( \frac{16 – 14}{28} \right) \times 100$ 
Step 5: Perform the subtraction.
$\text{FOC} = \left( \frac{2}{28} \right) \times 100$ 
Step 6: Divide and multiply by 100.
$\text{FOC} = 0.0714 \times 100 = 7.14\%$
The FOC percentage is 7.14%.
Final Words
The Arrow FOC Calculator is a valuable tool for archers who want to optimize their arrow performance. By entering the total arrow length and the distance to the balance point, you can quickly calculate the FOC percentage.