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
![Calculation of open area for perforation patterns Calculation of open area for perforation patterns](http://www.rmig.com:8080/erez3/erez?src=RMIG/Patterns/Perforated metal/C4U6_38.tif&tmp=1-1&top=0.33404664&bottom=0.62149533&right=0.91773564&width=214&height=88&quality=-1&format=jpeg)
Link to formulae that can calculate the open area of perforation patterns.
Weight of a perforated sheet
![Calculate the weight of a perforated sheet Calculate the weight of a perforated sheet](http://www.rmig.com:8080/erez3/erez?src=RMIG/Sheets/SE Campaign 2009 9.tif&tmp=1-1&top=0.17487084&left=0.075&bottom=0.72670807&right=0.97523674&width=214&height=88&quality=-1&format=jpeg)
Link to a formula that can help you to calculate the weight of a perforated sheet.
Size of an unfolded sheet
![Folded perforated sheet Folded perforated sheet](http://www.rmig.com:8080/erez3/erez?src=RMIG/Sheets/Step (SQUARE) 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)
Link to formulae that can calculate the flat size of a sheet.