KEVOS® MAKEOS · Fabrication
Perforated Sheet Open Area and Hole Count
What open area, hole count and weight does a perforated sheet with this hole and pitch have?
Open area percentage of perforated sheet with round holes on a 60° staggered or straight (square) pattern, holes per square metre, the solid fraction and the mass of a sheet of given size, thickness and density.
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How this tool works
Inputs, units and where to find them
| Input | Unit | Typical source |
|---|---|---|
| Hole pattern | choice | Layout of the holes. |
| Hole diameter | mm | Hole diameter. |
| Hole centre distance (pitch) | mm | Distance between adjacent hole centres. |
| Sheet area | m² | Overall sheet area. |
| Sheet thickness | mm | Sheet thickness. |
| Material density | kg/m³ | Density of the sheet material. |
Method and formulas
- 60° staggered: open area = 90.69 (d ÷ p)² %, holes per unit area = 1.1547 ÷ p².
- Straight rows: open area = 78.54 (d ÷ p)² %, holes per unit area = 1 ÷ p².
- Mass = area × thickness × density × (1 − open fraction).
- Example: 5 mm holes at 8 mm staggered pitch give 35.426% open area.
Limitations
- Margins and unperforated borders are not included.
- Strength and stiffness of perforated sheet fall faster than the open area suggests; use the supplier’s effective properties.
- Example values are illustrations. Replace them with values for your actual task.
Typical uses
- Specify perforated guards, screens and filters
- Estimate air or light flow through a perforated panel
- Work out perforated sheet weight
Who it is for
- Design engineers
- Fabrication supervisors
- Buyers
What you get
- Open area
- Holes per square metre
- Perforated sheet mass
Interpreting the result
- Open area sets flow and visibility; ligament width (pitch minus hole) sets punchability and strength.
References
- Machinery’s Handbook, 29th edition (Industrial Press, 2012), printed pp. 2607–2608. Topic reference; no source tables or recommended settings are reproduced.
WORKOS tools are screening and decision-support utilities. Verify important financial, engineering, safety, legal or operational decisions using appropriate professional standards and your organisation’s approved data.
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