Perforation formulae
There are some calculations that are helpful when working with perforated sheets. On this page you will find links to formulae explaining such calculations.
Please select the category of relevance in the menu to the left or click on the appropriate arrow below.
Calculation of open area
Link to formulae that can calculate the open area of perforation patterns.
Weight of a perforated sheet
Link to a formula that can help you to calculate the weight of a perforated sheet.
Size of an unfolded sheet
 LR 7x20 ANTI-SKID HIGH SECURITY.tif&tmp=1-1&top=0.67757009&left=0.2306712&bottom=0.97196262&right=0.94658029&width=214&height=88&quality=-1&format=jpeg "Folded perforated sheet")
Link to formulae that can calculate the flat size of a sheet.
