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Roll Length Calculator — Diameter, Core & Thickness

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Diameter/width unit Thickness unit Current outer diameter Core outside diameter Material thickness Total flat thickness of one wound layer.Roll width (optional) 0 disables material-area output.Original full-roll diameter (optional) 0 disables percent-remaining output.Known measured roll length (m, optional) 0 disables effective-thickness calibration.

Calculated result

134.4 m estimated length

440.94 ft · 620 theoretical wraps

Enter roll width to estimate material area

Enter original full-roll diameter to estimate percent remaining

Enter a known measured roll length to calibrate effective wound thickness

Show the working

1. Normalize: OD 100 mm, core 38 mm, thickness 0.05 mm.
2. Annulus area = π × (100² − 38²) ÷ 4 = 6,719.87 mm².
3. Length = annulus area ÷ thickness = 134,397.33 mm = 134.397 m.
4. Wrap count = (100 − 38) ÷ (2 × 0.05) = 620.

Ideal cylindrical-roll estimate. It assumes uniform flat thickness, tight concentric winding and no air gaps, stretch or compression. A measured-length calibration diagnoses effective wound thickness but does not alter the primary nominal-thickness result.

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