Western PA 3-D Archery CalendarCalculate Your Arrow's Front of Center %Percent Front Of Center represents the percentage of forward weight on your arrow. For indoor match shooting, the ideal %FOC is between 7% and 9%. For hunting situations using broadheads, the ideal %FOC is between 9% and 15%. 1. Arrow Length - Total arrow length in decimal inches. (ie: 27.5). 2. Balance Point - The distance in decimal inches from the arrow tip to the point on the arrow shaft where it will balance. (ie: 11.125). The above example would produce a Front Of Center Percentage of 9.55.
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