How to use this calculator
Start with the deterministic fixture values already shown, then replace each input with measurements from your job. Use consistent units and review the highlighted assumptions before using the result in purchasing or production.
Formula and method
The calculator normalizes every dimension to millimetres, applies L = π × (D² − d²) ÷ (4 × t), divides web length by label pitch, rounds down to whole labels, then applies waste and rounds down again.
Worked example
For a 203 mm roll, 76 mm core, 0.16 mm combined material-and-liner caliper, and 103 mm pitch, the estimate is 173.93 m of web, 1,688 whole labels before waste, and 1,654 after 2% waste.
How to interpret the result
Use the result for purchasing and rough planning, then reconcile it against a physically counted supplier roll of the same construction.
Limitations
This is an ideal geometric estimate, not a guaranteed roll count. Compression, adhesive, liner variation, winding tension, telescoping and actual roll build can shift yield. Caliper must include every wound layer.
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