Question 1046539
I have a roll of clear plastic pallet wrapping film with the following criteria :

Total roll weight - 14.58 kilogram
Inner core weight - 1.554 kilogram
Film weight - 13.026 kilograms (total roll weight less core weight)
Film width - 500mm
Film Thickness - 17 microns

How can I work out the true linear length of the film without unrolling it, as the unrolling process will stretch the film and give a false measurement? 
And is the same calculation used for different micron thicknesses?
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More info is needed.
If you have the density, the length can be calculated.
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Or, the inside and outside diameter of the roll.