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Open Area Calculators

Calculate open area, given hole diameter and spacing — or calculate spacing, given hole diameter and open area.

Round - 60° Staggered Center

Rd60stag
- Hole Diameter (D)
- Spacing (S)
- Open Area (OA)
- Holes per Square Inch (HPSI)

Round - Straight Center

Rdstra
- Hole Diameter (D)
- Spacing (S))
- Open Area (OA)
- Holes per Square Inch (HPSI)

Square - Straight or 45° Staggered Center

Square
- Hole Diameter (D)
- Spacing (S)
 - Open Area (OA)
 - Holes per Square Inch (HPSI)

Round End Slot - Staggered Center

Res_stag
- 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

Res_str
- 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

Sqend_slot
- Width of Slot (W)
- Length of Slot (L)
- Side Center (B)
- End Center (A)
 - Open Area (OA)
 - Holes per Square Inch (HPSI)

Hexagon

Hexagon
- Hole Diameter (D)
- Spacing (S)
 - Open Area (OA)
 - Holes per Square Inch (HPSI)

Round 45° Staggered Center

Rd45stag
- Hole Diameter (D)
- Spacing (S)
 - Open Area (OA)
 - Holes per Square Inch (HPSI)