Free web calculator
Film Roll Calculator
Calculate theoretical roll diameter, length or weight from the dimensions you know.
Display settings
Region and units can be changed independently.
What do you want to calculate?
Choose a result to see only the inputs it needs.
Core presets
Result
Roll Diameter
—mm
Theoretical value. Actual roll dimensions may differ due to winding tension, trapped air, thickness variation, or winding condition.
How it works
Calculate length from the roll cross-section
Quick core presets
Fill the common 3-inch or 6-inch core diameter with one button. The value automatically follows the selected unit system.
Results are theoretical
The calculation does not account for winding tension, trapped air or thickness variation. Use the result as a practical estimate.
FilmCalc
Need more specialized calculations?
FilmCalc also includes bag weight, barrier calculations and a material master.