Roll Length Calculator
Result
Roll Length (mm)65,973
In Meters66.0
↗ Everyday Life
Roll Length Calculator — free online calculator.
Formula
Roll length ≈ π×(outer diameter² − core diameter²)/(4×material thickness).
- Roll Length Calculator calculates its result from Thickness, Rate (decimal). It uses the formula Length = π(R² - r²) / thickness. Change any input to recalculate the result instantly.
- The main inputs are Outer Diameter, Core Hole Diameter, Paper Thickness. Enter them in the units and format shown in the calculator.
- Use the units, labels and assumptions shown beside each input so the formula is applied consistently.
- Changing any input above recalculates the result with the same calculation engine used by this page.
Example: Roll Length
Inputs
- Outer Diameter: 100 mm
- Core Hole Diameter: 40 mm
- Paper Thickness: 0.1 mm
Using Thickness = 2, Rate (decimal) = 0.05, the calculated result is 0.
Sample result: Calculating…
Frequently asked questions
What does the Roll Length calculate?
Roll Length Calculator — free online calculator.
Which values should I enter?
Enter Outer Diameter, Core Hole Diameter, Paper Thickness using the units and format shown beside each field.
What formula does this calculator use?
The calculator uses the following relationship: Roll length ≈ π×(outer diameter² − core diameter²)/(4×material thickness)..
Why might my result differ from another source?
Results can differ when another source uses different units, rounding rules, conventions or assumptions. Compare the inputs and definitions before comparing results.
Does the result update automatically?
Yes. Changing an input updates the result using the same calculation engine shown on this page.