Arrow FOC Calculator

Calculate Front of Center (FOC) percentage to determine arrow balance and flight characteristics for target or hunting use.

Total Arrow Length

Balance Point

Tab to move between fields

FOC Percentage

7.1%

ClassificationLow — target shooting OK

Hunting AdequateNo

How to Use This Calculator

Measure your Total Arrow Length from nock groove to end of shaft (excluding point).
Find the balance point by resting the arrow on a finger and measuring from the nock groove.
Enter both measurements in inches.
Review your FOC Percentage — 10-15% is ideal, 15-19% suits hunting.
Check the Classification and Hunting Adequate assessment for your setup.

How the result changes with Total Arrow Length

Total Arrow Length: Full arrow length from nock groove to end of shaft (excluding point).
Balance Point: Distance from nock groove to balance point (where arrow balances on finger).

FOC Percentage: Front of Center percentage — 10-15% is ideal for most uses.
Classification: FOC range classification per Easton guidelines.
Hunting Adequate: Whether FOC is in the recommended range for hunting (10-19%).

Identify Input Parameters
Total Arrow Length = 28, Balance Point = 16 = 2 input(s) provided
Calculate FOC Percentage
FOC Percentage
7.1 = 7.1
Calculate Classification
Low — target shooting OK = Low — target shooting OK

Engine last updated July 26, 2026. Checked against 3 independently-derived tests — how we verify calculators.

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