Expanded Metal Weight & Open Area Calculator

Enter Expanded Metal Details

Start with SWD, LWD, strand width, thickness and sheet size. Use known open area if your drawing or stock table already provides it.

Pattern & Calculation Mode

This is a procurement estimate. Load capacity, span, deflection and anti-slip performance require project review.

Calculation mode Expanded metal type SWD short way mm LWD long way mm Strand width mm Strand / plate thickness mm

Sheet & Order Details

Material Sheet width mm Sheet length mm Quantity sheets Allowance % Surface treatment Drawing available Application

Optional drawing fields

Overall finished thickness mm SWO short opening mm LWO long opening mm

RFQ preparation only. Final weight depends on drawings, material grade, raised or flattened type, tolerances, surface treatment and production method.

Style reference preview Raised / standard | SWD 30 mm | LWD 60 mm | strand 3 x 2 mm | OA 80.00%

Open area 80.00%

Approx. kg/m2 3.14 kg/m2

Weight per sheet 6.28 kg

Total weight 62.80 kg

Sheet size: 1000 x 2000 mm
Material: Carbon steel
Solid material: 20.00%
Solid sheet reference: 31.40 kg/sheet
Warnings: Use this result for sourcing discussion only. Confirm final values with drawings or stock tables.

RFQ summary

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How This Calculator Works

The pattern estimate mode uses SWD and strand width to estimate the solid metal percentage, then calculates sheet weight from thickness, material density and sheet size.

Use pattern estimate when you know SWD, LWD and strand size.
Use known open area when a drawing or stock table already provides open area.
Use the result as an RFQ starting point, not as a load-bearing or engineering result.

Formula Notes

Solid fraction: 2 x strand width / SWD.

Open area: (1 - solid fraction) x 100.

Weight per sheet: sheet area x thickness x material density x solid fraction.

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FAQ

Expanded metal calculator questions

Does this calculator give the final expanded metal weight?

No. It gives a sourcing estimate for RFQ preparation. Final weight depends on drawings, material grade, raised or flattened type, tolerances, surface treatment and production method.

What are SWD and LWD in expanded metal?

SWD means short way of diamond, and LWD means long way of diamond. They describe the diamond pattern size and should be confirmed from drawings or supplier specification tables.

Can I use a known open area from a drawing?

Yes. If your drawing or stock table already provides open area, use known open area mode and enter sheet size, thickness, material and quantity.

Does this confirm load capacity for grating or walkways?

No. Load capacity, span, deflection, anti-slip performance and local safety compliance require project-specific engineering review.

Expanded Metal Weight Calculator & Open Area Calculator