Arrow FOC Calculator

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Calculates the Forward of Center (FOC) balance point for an arrow, which is crucial for archery accuracy. FOC is expressed as a percentage of the arrow's total length.

How To Use

How to use this calculator

Start with your values, or try a preset.

Step 1

Enter Arrow Length (inches) and Balance Point from Nock (inches) in the units shown.

Step 2

Read FOC Percentage in the results panel. Results update as you change the inputs.

Step 3

Choose a preset to load an example, then adjust the values for your situation.

Worked Examples

Example calculations

See the inputs and their calculated results.

Example 1

Arrow Length (inches): 28 inches; Balance Point from Nock (inches): 15.4 inches

FOC Percentage: 5 %

Example 2

Arrow Length (inches): 29 inches; Balance Point from Nock (inches): 16 inches

FOC Percentage: 5.2 %

Example 3

Arrow Length (inches): 27 inches; Balance Point from Nock (inches): 14.5 inches

FOC Percentage: 3.7 %

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