Archery term
FOC (Front of Center)
Definition
FOC, or front of center, is the percentage of an arrow's total length by which its balance point sits forward of the physical center of the arrow. It is calculated by finding the balance point, measuring how far it is ahead of center, dividing that distance by the overall arrow length, and multiplying by 100.
Why it matters
FOC describes how front-heavy an arrow is, which influences the stability of its flight and how it recovers from the bow. Higher FOC generally improves forgiveness and downrange stability at some cost to trajectory, so target and field archers tune FOC by adjusting point, insert, and shaft weight to balance accuracy against speed.
Related terms
Where it applies
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