Roll Length - smith-web-dev/smith-calc GitHub Wiki

Overview

This calculator will determine the approximate length of a roll. The accuracy of this calculation is highly dependent on how tightly the roll is rolled up and how true to circular the roll is.

Measurements

  • Outside diameter (O.D.) of the roll
  • Outside diameter (O.D.) of the core (Or inside diameter [I.D.] of the roll)
  • Thickness of the material

The Calculation

The length of the roll (in inches) is found by the formula: L = (π * (r² - c²)) / t
Where r is the radius of the roll, c is the radius of the core, and t is the thickness of the material.

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