Label roll length calculator
Work out how many metres — and how many labels — are on a roll from its diameter, core and material thickness.
This is an estimate. Winding tension, air between the layers and thickness tolerance change the real length slightly.
How this works
The wound material forms a ring. Its cross-section area divided by the material thickness gives the length: length = π × (D² − d²) ÷ (4 × thickness), where D is the roll's outer diameter and d the core's outer diameter. With a label length and gap, the length is divided by the repeat to count labels.
Common questions
Which thickness should I enter?
The total thickness of the label stock as it is wound: face material, adhesive and liner together. It is on the material's technical data sheet, or you can measure it with a micrometer.
Which core diameter do I use?
The outer diameter of the core, not the inner one. Cores are usually named by their inner diameter, so measure the core itself.