Step 2. Determine Your Film Usage
Next, you’ll need to become more familiar with the math involved in shrink film packaging. Knowing your price per roll is great, but knowing your price per package is even better. Understanding what each package costs, how to calculate it and how you can save money will put you in a much better position to budget appropriately and maximize cost efficiency.
The math starts with a determination of your actual film usage and then leads into your actual cost per package:
Film length divided by film cut-off, minus the rewrap percentage, equals your film usage. Let’s say, for example, that your film length is the standard 4,375 feet per roll for 60-gauge center-folded film. Converted to inches, that is 52,500. Assume the film cut-off is 11 inches. If you divide this, it comes to roughly 4,772 packages per roll. Subtract the rewrap percentage of, say, 3%, and you get roughly 4,629 packages per roll of film.
4,375 feet per roll = 52,500 inches per roll
52,500 ÷ 11 inches of film cut-off = 4,772.73 packages per roll
4,772 × .03 re-wrap percentage = 143.16
4,772 - 143.16 = 4,629.57 packages per roll of film