How it works

Know what fits
on your reel.

One known capacity. Every braid size.
Find your next spool in metres, yards, mm or PE.

Your reel’s capacity

Use the capacity printed on your spool or box.

Calculates as you type

Try a different braid

Estimated capacity

—m

— yards

Find your braid size

Estimated lengths for the same spool fill.

Estimated reel capacity by braid size. Select a size to use it in the custom result.
PE size Approx. diameter Metres Yards Relative length
Select a size to explore it above.

The maths behind the spool

A reel holds a fixed volume of line. As diameter increases, the length that fits decreases with the square of that diameter.

New length = known length × (known diameter ÷ new diameter)²

PE is a fibre density rating, not an exact diameter. PE inputs use the VARIVAS approximate PE diameter chart (PE 0.1–30). Sizes between entries are estimated by interpolating cross-sectional area.

Use the braid’s stated diameter when available. Braid construction, coating, winding tension and backing affect actual capacity. Estimates assume the same fill level and no change in backing.

1 yard = 0.9144 metres. Results are rounded to the nearest metre or yard; calculations retain full precision.