Convert Roll OD to kg
Formula = pi x h x (R² – r²) x film density / 1000000
pi = 3.14
h = film / web / roll width
R² = square of Roll OD Radius (R = OD/2)
r² = square of Roll ID Radius (r = ID/2)
film density = BoPP 0.91, Pet 1.4, Foil 2.7
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Steps How to Convert Roll OD into kg
![Roll OD to KG](http://gsmcalculator.com/wp-content/uploads/2020/07/Roll-OD-to-kg-to-Meter-Raw-Material-Calculation-Flexible-Packaging.jpg)