The free area calculator enables you to determine quickly and accurately the percentage of open area for a selected perforated sheet type. This parameter is essential when assessing the passage of light, air or liquids and is frequently required in project documentation. With our online tool, you can obtain the parameters you require within seconds – simply, online and free of charge. Streamline both the design and validation of your projects with this practical resource.
Calculation of free area and number of holes per m²
Perforation type
% free area
Number of holes per 1m²
Enter parameters
% free area
Number of holes per 1m²
Rv – Round, staggered pitch
Rv
Round, staggered pitch
% free area
Number of holes per 1m²
R² x 90,69
T²
1,154,700
T²
Enter parameters
Calculate
% free area
Number of holes per 1m²
Qg – Square, straight pitch
Qg
Square, straight pitch
% free area
Number of holes per 1m²
C² x 100
U²
1,000,000
U²
Enter parameters
Calculate
% free area
Number of holes per 1m²
Rg – Round, straight pitch
Rg
Round, straight pitch
% free area
Number of holes per 1m²
R² x 78,50
U²
1,000,000
U²
Enter parameters
Calculate
% free area
Number of holes per 1m²
Qv – Square, staggered pitch
Qv
Square, staggered pitch
% free area
Number of holes per 1m²
C² x 100
0,5 x (Z1 x Z2)
1,000,000
0,5 x (Z1 x Z2)
Enter parameters
Calculate
% free area
Number of holes per 1m²
Lv – Oval, staggered pitch
Lv
Oval, staggered pitch
% free area
Number of holes per 1m²
(R x L - 0,215R²) x 100
0,5 x (Z1 x Z2)
1,000,000
0,5 x (Z1 x Z2)
Enter parameters
Calculate
% free area
Number of holes per 1m²
Lg – Longitudinal, straight pitch
Lg
Longitudinal, straight pitch
% free area
Number of holes per 1m²
(R x L - 0,215R²) x 100
(Z1 x Z2)
1,000,000
(Z1 x Z2)
Enter parameters
Calculate
% free area
Number of holes per 1m²
Examples of perforation types with maximum free area (%):
- Round, staggered pitch - Rv 2-2,5 - 58,04%
- Square, straight pitch – Qg 10-12 - 69,44%