Enter the distance from the nock groove to the finished arrow balance position (in) and the arrow length (in) into the Forward of Center Calculator. The calculator will evaluate the Forward of Center. 

Forward of Center Formula

The following two example problems outline the steps and information needed to calculate the Forward of Center.

FOC = (A+L)/2/L *100

Variables:

  • FOC is the Forward of Center (%)
  • A is the distance from the nock groove to the finished arrow balance position (in) 
  • L is the arrow length (in) 

How to Calculate Forward of Center?

The following steps outline how to calculate the Forward of Center.

  1. First, determine the distance from the nock groove to the finished arrow balance position (in). 
  2. Next, determine the arrow length (in). 
  3. Next, gather the formula from above = FOC = (A+L)/2/L *100.
  4. Finally, calculate the Forward of Center.
  5. After inserting the variables and calculating the result, check your answer with the calculator above.

Example Problem : 

Use the following variables as an example problem to test your knowledge.

distance from the nock groove to the finished arrow balance position (in) = 13

arrow length (in) = 25

FOC = (A+L)/2/L *100 = ?