Open Air Calculator

Pattern Layout and Open Area Calculation

Please use numbers in decimal format. Use the conversion table for fractions.

Round - 60° Staggered Center
- Hole Diameter ( D )
- Center ( C )
 - Open Area ( OA )
 - Holes per Square Inch ( HPSI )
   
Round - Straight Center
- Hole Diameter ( D )
- Center ( C )
 - Open Area ( OA )
 - Holes per Square Inch ( HPSI )
   
Square - Straight or 45° Staggered Center
- Hole Diameter ( D )
- Center ( C )
 - Open Area ( OA )
 - Holes per Square Inch ( HPSI )
   
Round End Slot - Staggered Center
- Width of Slot ( W )
- Length of Slot ( L )
- Side Center ( B )
- End Center ( A )
 - Open Area ( OA )
 - Holes per Square Inch ( HPSI )
   
Round End Slot - Straight Center
- Width of Slot ( W )
- Length of Slot ( L )
- Side Center ( B )
- End Center ( A )
 - Open Area ( OA )
 - Holes per Square Inch ( HPSI )
   
Square End Slot - Staggered or Straight Centers
- Width of Slot ( W )
- Length of Slot ( L )
- Side Center ( B )
- End Center ( A )
 - Open Area ( OA )
 - Holes per Square Inch ( HPSI )
   
Hexagon
- Hole Diameter ( D )
- Center ( C )
 - Open Area ( OA )
 - Holes per Square Inch ( HPSI )
   
Round 45° Staggered Center  
- Hole Diameter ( D )
- Spacing ( S )
 - Open Area ( OA )
 - Holes per Square Inch ( HPSI )