Roll Length Calculator

Estimate the length of material on a roll.

Outer diameter

Core diameter

Material thickness

Length 441.79

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

Step-by-step with your numbers:

1. Values used:

2. Outer diameter = 6

3. Core diameter = 1.5

4. Material thickness = 0.005

6. Length = 441.79

Did we solve your problem today?

Estimate how long a roll of tape paper or film is.

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.