Expanded Metal Weight Calculator
Estimate expanded metal open area, material area, sheet weight, total order weight, strand volume, and flattening adjustment from sheet size, SWD, LWD, strand size, and density.
Choose a common raised or flattened pattern, then adjust measurements to match the sheet in hand.
Expanded metal result
Calculation breakdown
| Common spec | Material | SWD x LWD | Strand W x T | Typical weight |
|---|---|---|---|---|
| 3/4 #9 raised | Carbon steel | 0.923 x 2.000 in | 0.150 x 0.134 in | About 3.1 to 3.3 lb/ft² |
| 1/2 #13 raised | Carbon steel | 0.500 x 1.200 in | 0.096 x 0.090 in | About 1.6 to 1.9 lb/ft² |
| 1-1/2 #9 raised | Carbon steel | 1.333 x 3.000 in | 0.150 x 0.134 in | About 2.5 to 3.0 lb/ft² |
| 3/4 #16 raised | Aluminum | 0.923 x 2.000 in | 0.081 x 0.050 in | About 0.45 to 0.70 lb/ft² |
| 2 #10 grating | Carbon steel | 2.000 x 5.330 in | 0.240 x 0.135 in | About 2.8 to 3.6 lb/ft² |
| Material | Density lb/in³ | Density kg/m³ | Weight tendency | Typical expanded metal use |
|---|---|---|---|---|
| Carbon steel | 0.284 | 7860 | Baseline | guards, walkways, panels |
| Galvanized steel | 0.286 | 7920 | Slightly heavier | outdoor screens and cages |
| 304 stainless | 0.289 | 8000 | Heavier than mild steel | food, washdown, corrosion areas |
| 3003 aluminum | 0.099 | 2730 | About one-third steel | vents, infill, light guards |
| Copper | 0.323 | 8940 | Heavy | screens and conductive panels |
| Geometry condition | Effect on open area | Effect on weight | What to measure | Calculator input |
|---|---|---|---|---|
| Wider strand | Lower open area | Higher weight | Solid strand width | Strand width |
| Thicker strand | Little visual change | Higher weight | Material thickness | Strand thickness |
| Shorter SWD | Lower open area | More diamonds per sheet | Short diamond pitch | SWD |
| Longer LWD | Higher open area | Fewer diamonds per sheet | Long diamond pitch | LWD |
| Flattened sheet | Opening shape changes | Small rolling change | Actual finished sheet | Flattening factor |
| Sheet size | Area ft² | Area m² | Typical shop use | Handling note |
|---|---|---|---|---|
| 24 x 48 in | 8.00 | 0.74 | small guards and panels | easy one-person handling |
| 36 x 96 in | 24.00 | 2.23 | machine guards | support long edges |
| 48 x 96 in | 32.00 | 2.97 | standard full sheet | watch spring and twist |
| 48 x 120 in | 40.00 | 3.72 | large screens | plan two-person lift |
| 60 x 120 in | 50.00 | 4.65 | platform and enclosure work | verify rack capacity |
When you order expanded metal, you’ll be surprised how heavy a single sheet can get. It appears lightweight… Easily carried by hand, until you order 10 and suddenly have an invoice for a forklift sitting in your inbox. How on earth did a bunch of holes become such a heavyweight? The truth about its weight matter since expanded metal doesn’t always act like a solid plate.
The strength lie within the strands remaining after stretching into a diamond pattern. These strands are what make it strong; they also dictate both its structural performance and its shipping cost. Understanding what it all realy means is the trick.
Why Expanded Metal Is So Heavy
If you set your pattern as say 3/4 #9 you’re doing more than picking a look. You’re picking thickness and the strand width. You’re also picking two of the four diamond sizes, either long way or short way, that gets expanded out. Those combine to determine final weight of the metal after expansion process.
The wider the strand gets on the same number of total beads it will take up a larger percentage of open area. That means fast poundage increase. Thicker strands also does the same, even if they look like they have the same hole size at first. After expanding, the flattening process alters geometry. This changes both look and mass. It alters things again.
And then there’s the matter of material selection. Most people wouldn’t think this would make much difference, but it does. At the low end we have carbon steel. Upgrade to 304 stainless and you immediately increase density. Aluminum will drop weight by about two thirds. Sounds great…until you realize the strands lose stiffness and sheet starts to feel springy under load. If you want copper, well that has its weight as well as that distinct color. It is good if you are making decorative screens, but it is costly when you pay real money for each additional pound.
Once you choose your alloy the calculator handles all those switches easy. Just click on the material and note how a simple swap will affect the entire order in terms of sheets and total order mass.
There’s also reality in sheet size planning. When a standard 4-by-8 foot panel sounds simple enough, consider the ragged edges that normally get trimmed. These selvage strips can eat three to five percent of your usable material. Avoiding consideration of them makes for an unpleasant surprise come delivery time. It is not glamorous engineering, but edge allowance protect against running short on projects.
The same applies to the flattening factor. Bonds retain their entire thickness when raised expanded metal is carried. Flattened material is rolled, which changes the strand shape and result in a slightly lower final weight. Small difference, but it multiplies across a large order.
Function shows up in the open area percentage. Anything over 70% open is great for ventilation and airflow. It also allow for guards with good visibility. Below 40% and you’re starting to hold what’s more like a heavy screen that blocks more than it reveals. Stiffness also come into play with the number of diamonds per sheet. More strands working together makes smaller diamonds surprisingly rigid even on a lighter gauge. Bigger diamonds save weight at the expense of that interconnected strength.
Every shop make the same mistakes. They measure across the opening instead of the solid strand. They neglect that because of manufacturing tolerances, the actual SWD and LWD may be a little smaller or larger than their nominal spec. They overlook checking density if they’re ordering mill-run material. This material could be lower density than what’s written in book. None of these are major gaffes…until the pallets arrive and don’t match the engineered load rating. The truck might show up heavier then expected if you don’t confirm the density.
The sooner you get the weight correct, the earlier you can design around it. You can then ship it correctly and install it with confidence. Spending just a few minutes reviewing strand dimensions to ensure they match the sheet in front of you would of saved you from hours of headache down the road.
Numbers are important, but knowing why the numbers happen is even more so. If you know the interaction between thickness, pitch, strand width and finish, then expanded metal ceases to be mysterious. You’ll start ordering it correctly, predicting it, and using it without surprises.
