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Calculation of open area

The formulas on this page are used to calculate the airflow of a perforation. Changing the size of the holes or the pitch will result in a larger or smaller percentage of open area.
 
Please note that the formulas do not indicate whether any perforation is possible: they are entirely to be used for calculation of the airflow, e.g. pitch size must in general be minimum hole size + thickness.

 Calculation of open area: round holes, triangular pitch
Enter hole size in mm: R
Enter pitch in mm: T
Submit

 Calculation of open area: round holes, rectangular pitch
Enter hole size in mm: R
Enter pitch 1 in mm: U1
Enter pitch 2 in mm: U2
Submit

 Calculation of open area: square holes, rectangular pitch
Enter hole size in mm: C
Enter pitch 1 in mm: U1
Enter pitch 2 in mm: U2
Submit

 Calculation of open area: square holes, staggered pitch
Enter hole size in mm: C
Enter pitch 1 in mm: Z1
Enter pitch 2 in mm: Z2
Submit

 Calculation of open area: slot holes, staggered pitch
Enter the width of the hole in mm: R
Enter the length of the hole in mm: L
Enter pitch 1 in mm: Z1
Enter pitch 2 in mm: Z2
Submit

 Calculation of open area: rectangular holes, staggered pitch
Enter the width of the hole in mm: C
Enter the length of the hole in mm: L
Enter pitch 1 in mm: Z1
Enter pitch 2 in mm: Z2
Submit

Reservations
Please note that we make reservations with regard to any mistakes in the results of calculations made on this page, e.g. errors made when typing in values or errors in the formulas themselves.