Holes Per Square Inch Calculator
Calculate the density of holes in materials, fabrics, or perforated surfaces for industrial and design applications
Calculation Results
HPI
Holes Per Square Inch
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%
Open Area Percentage
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Ø
Hole Spacing (Approx.)
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#
Holes Per Square Foot
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Interpretation Guide
L
Low Density (0-10 HPI)
Light perforation, minimal airflow restriction. Common in decorative applications.
M
Medium Density (10-50 HPI)
Balanced airflow and structural integrity. Used in filters and ventilation.
H
High Density (50+ HPI)
Maximum airflow, reduced structural strength. Common in sieves and screens.
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