The calculation, without hidden assumptions
Estimate theoretical expanded-metal mass from strand geometry, then keep it separate from manufacturer nominal weight. Raised or flattened mesh, bonds, tolerances and production geometry can make delivered mass differ from this idealized strand model.
How to use this calculator
Enter short-way diamond (SWD), strand width and strand thickness.
Choose mm/in, then enter sheet width/length and quantity.
Use the documented material density; steel defaults to 7,850 kg/m³.
Optionally enter purchasing allowance, rate/kg, target mass or supplier kg/m².
For a named expanded-metal style, use the current manufacturer table or certificate for final procurement and loading.
Where people use it
- •Estimate custom expanded-mesh sheet and batch weight.
- •Compare theoretical kg/m² with a supplier published value.
- •Plan purchasing allowance, material cost and transport mass.
- •Estimate approximate open area from SWD and strand width.
- •Reverse a target shipment mass into whole equal-size sheets.
50 mm SWD × 3 mm strand × 2 mm steel mesh
Ideal metal fraction ≈ 2×3÷50 = 0.12. At 2 mm thickness and 7,850 kg/m³, theoretical mass ≈ 1.884 kg/m². A 1.2 × 2.4 m sheet is about 5.426 kg; 10 sheets about 54.26 kg.
What the result does not assume
- •This is an idealized strand model, not a manufacturer style-table replacement.
- •Raised and flattened expanded metal can differ in overall thickness and production geometry; SWD/LWD terminology must match the supplier drawing.
- •Bond geometry, shearing, coatings and manufacturing tolerances can change delivered weight.
- •The open-area result is an approximation from SWD and strand width, not a certified optical/free-area measurement.
- •This calculator estimates mass only; it does not determine load capacity, deflection, slip resistance or structural suitability.
Frequently asked questions
How do you calculate expanded metal weight?+
A useful theoretical model estimates the metal fraction as twice strand width divided by SWD, then multiplies that fraction by base-metal thickness and density to obtain mass per square metre.
Why can supplier kg/m² differ from the calculator?+
Actual mesh includes bond geometry, forming, flattening, tolerances and coatings. Manufacturer nominal tables or certificates should control named commercial styles.
What are SWD and strand width?+
SWD is the short-way diamond pitch measured center-to-center across bonds; strand width is the width of the metal strip forming the diamond.
Does this calculate open area?+
It provides an approximate open-area percentage from SWD and strand width. Use manufacturer data when certified open area matters.
Can I calculate sheet and order weight?+
Yes. Enter sheet dimensions and whole-sheet quantity; optional allowance and rate/kg provide order mass and cost.
Is this an expanded-metal grating design calculator?+
No. It estimates mass and approximate open area only; use manufacturer engineering data and applicable design requirements for load-bearing grating.
Semantic next steps
Continue the calculation
These links move to a different input, formula or project stage rather than a keyword variation of this page.
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