Perforation: Open Area Calculation

On this page, you can quickly calculate the percentage of open area of a perforated sheet with respect to the non-perforated surface.

1. Choice of type of perforation

Staggered round hole 60°
Level round hole 90°
Staggered round hole 45°
Staggered elongated hole
Level elongated hole
Level square hole
Staggered square hole

2. Entering technical data

Drilling Data

D - Diameter mm:

P - Pitch mm:

Edges along perimeter

Material Data

Metal Sheet Width mm:

Metal Sheet Length mm:


Thickness mm: *