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Fishing reel line capacity calculator

Estimate how much line your spool holds when you change line diameter, using the capacity printed on the spool.

This is a constant-volume estimate. Winding tension and braid compression affect the result, and the actual line diameter may differ from the label.

Enter your values, then calculate.

Method and limitations

New length = stated length × (stated diameter ÷ new diameter)². Convert yards to metres by multiplying by 0.9144, or metres to yards by dividing by 0.9144. Both diameters must be in millimetres. The result is rounded to the nearest metre and yard.

Sources

No external reference is documented for this calculation; its method and limitations are described above.