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A: There is a simple formula you can use to determine how much is left on the roll, based on the diameter of the roll.
Here’s how to determine the amount of material left on a roll, give or take an inch or two:
Roll length in feet = (0.06545/media thickness in inches) x (outer diameter squared – inner diameter squared)
All measurements are in inches, by the way.
For example, the outer diameter of the roll (core included) is 4 inches, the inner roll diameter is 3 inches, and the material thickness is .013 inches:
(.06545/.013) x (42 - 32)
5.03 x (16-9)
5.03 x 7 = 35.24
Roll length = 35.24 ft.
And, as always, if you have any questions, please call a LexJet account specialist at 800-453-9538.