Retrieve calculator

Type a spool diameter and a gear ratio, or tap a preset. The number is the most line one handle turn can bring back on a full spool.

One handle turn spins the rotor gear-ratio times; each rotor turn lays one wrap around the spool. On a full spool that wrap is the spool's circumference, so: max retrieve = π × spool diameter × gear ratio. (Circumference, not area — π × d, not π × r².)

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