Roll Length Calculator
Estimate wound web length from outer diameter, core diameter, and web thickness.
A QUICK WALKTHROUGH
How to use this tool
- Enter the measurements using the stated consistent units.
- Review the model assumptions.
- Calculate locally in your browser.
Formula and limits
Length = π(Do²−Di²)/(4t), assuming tightly wound uniform layers with negligible air gaps and compression. This is a simplified arithmetic model; it does not select process settings or guarantee product quality.
Privacy
Inputs remain in this browser and are not uploaded.
GOOD TO KNOW
Common questions
Does this guarantee production results?
No. It calculates the stated nominal relationship only.