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Open area calculator

Formula for calculating open area of perforation and number of holes per 1m²

Type of perforation

% open area
number of holes per 1m²

Insert the parameters

% open area
number of holes per 1m²

Rv

round staggered

Type of perforation
R² x 90,69
1,154,700
R:
T:
Qg

square in line/straight

Type of perforation
C² x 100
1,000,000
C:
U:
Rg

round in line/straight

Type of perforation
R² x 78,50
1,000,000
R:
U:
Qv

square staggered

Type of perforation
C² x 100
0,5 x (Z1 x Z2)
1,000,000
0,5 x (Z1 x Z2)
C:
Z1:
Z2:
Lv

oval staggered

Type of perforation
(R x L - 0,215R²) x 100
0,5 x (Z1 x Z2)
1,000,000
0,5 x (Z1 x Z2)
R:
L:
Z1:
Z2:
Lg

longitudinally in line

Type of perforation
(R x L - 0,215R²) x 100
(Z1 x Z2)
1,000,000
(Z1 x Z2)
R:
L:
Z1:
Z2:
Examples of different types of holes with maximum % of open area:

round staggered - Rv 2-2,5 - 58,04%
square in line/straight - Qg 10-12 - 69,44%

Type of perforation
Rv

round staggered

Function
% volné plochy počet děr na 1m²
R³ x 90,69
1,154,700
Calculation:
% volné plochy počet děr na 1m²
R:
T:
Examples of different types of holes with maximum % of open area:

round staggered - Rv 2-2,5 - 58,04%
square in line/straight - Qg 10-12 - 69,44%

Typ děrovaní
Qg

round staggered

Type of perforation
% volné plochy počet děr na 1m²
C² x 100
1,000,000
Calculation:
% volné plochy počet děr na 1m²
C:
U:
Type of perforation
Rg

round in line/straight

Type of perforation
% volné plochy počet děr na 1m²
R³ x 78,50
1,000,000
Calculation:
% volné plochy počet děr na 1m²
R:
U:
Type of perforation
Qv

square staggered

Type of perforation
% volné plochy počet děr na 1m²
C² x 100
0,5 x (Z x Z )
1,000,000
0,5 x (Z x Z )
Calculation:
% volné plochy počet děr na 1m²
C:
Z1:
Z2:
Type of perforation
Lv

oval staggered

Type of perforation
% volné plochy počet děr na 1m²
(R x L - 0,215R²) x 100
0,5 x (Z x Z )
1,000,000
0,5 x (Z x Z )
Calculation:
% volné plochy počet děr na 1m²
R:
L:
Z1:
Z2:
Type of perforation
Lg

longitudinally in line

Type of perforation
% volné plochy počet děr na 1m²
(R x L - 0,215R²) x 100
(Z x Z )
1,000,000
(Z x Z )
Calculation:
% volné plochy počet děr na 1m²
R:
L:
Z1:
Z2: