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Roll Length Calculator

Estimate the length of material on a roll.

Outer diameter

Core diameter

Material thickness

Calculated Output

Length 441.79

Formula: length = π(OD² − core²) ÷ (4×thickness×12)

Step-by-Step Breakdown

1. Values used:

2. Outer diameter = 6

3. Core diameter = 1.5

4. Material thickness = 0.005

6. Length = 441.79

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The math behind it

length = π × (OD² − core²) ÷ (4 × thickness × 12).

6 in OD, 1.5 in core, 5 mil → ~235 ft.

Compressed?

Assume the material is tightly wound.