Roll Length Calculator

Your details

Forward mode: find how much material is on the roll. Reverse mode: find what outer diameter is needed to wind a given length.
The overall outside diameter of the finished roll.
mm
The diameter of the hollow core or spool at the centre of the roll.
mm
The thickness of a single layer of the wound material.
mm
Optional: enter a per-unit-length cost to see the total value of material on the roll.
$ per m or ft
Roll length
268.79

Total length of material wound on the roll

Unitm
Number of turns620
Turns620

Roll holds 268.79 m in 620.0 turns

  • The roll holds 268.79 m of material wound in 620.0 turns.
  • The wound material occupies 62.0% of the roll radius (outer 200 mm, core 76 mm).
  • The formula assumes uniform thickness and perfectly concentric winding. Actual length may vary slightly due to material compression or uneven winding.

Next stepFor precision work, measure the material thickness with a micrometer rather than trusting printed specifications, as actual thickness can differ by up to 10% from nominal.

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