Calculation of perforated metal sheet weight per square meter can be done as reference below:

ps = absolute (specific) weight (Kg) , v/p = open area (%) , s = thickness mm , kg = [s*ps*(100-v/p)]/100

Open area calculation when holes 60Â° staggered:
V/p = open area (%) ,D = holes diameter (mm) ,P = holes pitch (mm) ,v/p = (D2*90,7)/p2

S = Thickness in mm D = Wire Diameter in mm P = Pitch in mm V = Open Area %

Some patterns as following:

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