Plate Weight Calculator
Find how much a metal plate weighs. Pick a rectangular or round plate, enter the size and thickness, subtract any holes, choose a material, and get the weight per plate, pounds per square foot, total weight in pounds and tons, and the cost by the pound — with by-thickness and by-material tables and a downloadable PDF.
| Thickness | lb/sq ft | Per plate | Total lb |
|---|---|---|---|
| Enter a plate size to compare thicknesses | |||
| Material | Density | Per plate | Total lb | Cost |
|---|---|---|---|---|
| Enter a plate size to compare materials | ||||
How to use the plate weight calculator
Four quick steps turn a plate size into the weight per plate, pounds per square foot, total weight in pounds and tons, and cost — with by-thickness and by-material tables and a downloadable report.
Pick the shape & size
Choose rectangle or round, then enter the length and width (or diameter) and the thickness.
Subtract any holes
Add the number and diameter of holes or cut-outs, and the count of identical plates.
Choose the material
Pick from steel to aluminum, copper, titanium and more — only the density changes.
Read results & save a PDF
Get the full weight breakdown with thickness and material comparisons, and add a price for cost.
How the plate weight is calculated
Weight is the area times the thickness times the material’s density, with any holes removed and scaled by the number of plates. Here is the exact math the calculator runs.
Worked example — 48 × 96 in steel plate, 1/4 in thick, 1 plate
Gross area: 48 × 96 = 4,608 in² = 32 sq ft
Per sq ft: 40.8 × 0.25 ≈ 10.2 lb/sq ft
Weight: 32 × 10.2 ≈ 326 lb
≈ 326 lb for a 4×8 ft quarter-inch steel plate (~0.16 tons, ~148 kg). Subtract any holes for a closer figure.
Plate weight reference charts
Handy lookups for steel plate weight by thickness, material densities, and standard stock sizes. These use nominal dimensions — confirm exact weights with your supplier.
| Thickness | lb/sq ft | 48 × 96 in plate |
|---|---|---|
| 1/8″ | 5.1 | ~163 lb |
| 1/4″ | 10.2 | ~326 lb |
| 3/8″ | 15.3 | ~490 lb |
| 1/2″ | 20.4 | ~653 lb |
| 1″ | 40.8 | ~1,306 lb |
Steel ≈ 40.8 lb per sq ft per inch of thickness. A 48×96 in plate is 32 sq ft.
| Material | Density (lb/in³) | vs. steel |
|---|---|---|
| Copper | 0.323 | Heaviest here |
| Bronze | 0.318 | ~12% over steel |
| Brass | 0.307 | ~8% over steel |
| Stainless | 0.289 | ~2% over steel |
| Steel (A36) | 0.284 | Baseline |
| Cast iron | 0.260 | ~8% lighter |
| Titanium | 0.163 | ~⅗ of steel |
| Aluminum | 0.098 | ~⅓ of steel |
Same dimensions, different weight — only the density changes. Aluminum is the lightest common plate.
| Size | In feet | Area |
|---|---|---|
| 48 × 96 in | 4 × 8 ft | 32 sq ft |
| 48 × 120 in | 4 × 10 ft | 40 sq ft |
| 60 × 120 in | 5 × 10 ft | 50 sq ft |
| 60 × 240 in | 5 × 20 ft | 100 sq ft |
Buying a standard size and cutting from it is usually cheaper than a custom blank. Plate is generally 3/16 in and thicker.
Everything the calculator works out
A plate size and material give you the full weight picture — per plate, per square foot, and total — plus thickness and material comparisons and a cost estimate.
Key figures behind the weight
Built for anyone weighing plate
From an estimator pricing a cut list to a fabricator planning a lift, the same calculator turns plate dimensions into pounds, tons, and cost.
Pricing a job and needs the weight and cost by the pound before placing a plate order.
- Enter size & thickness
- Add a price per pound
- Read total weight & cost
Needs weight per plate and total tonnage to size slings, cranes, and freight.
- Set the plate count
- Check per-plate & tons
- Subtract holes for net weight
Comparing thicknesses or materials to see how each choice drives weight.
- Compare thicknesses
- Flip materials
- Use round or rectangle
7 things to know about plate weight
A few details keep a plate-weight estimate honest and useful for ordering, lifting, and pricing.
Plate weight calculator FAQ
The sizing, weight, and material questions people ask most about metal plate.
Plate weight is the area times the thickness times the material’s density. Find the area of the plate (length times width for a rectangle, or pi over 4 times the diameter squared for a round plate), multiply by the thickness to get the volume, then multiply by the density of the metal.
For carbon steel that works out to about 40.8 pounds per square foot for every inch of thickness, so a quarter-inch steel plate weighs roughly 10.2 pounds per square foot.
Example: a 48 by 96 inch quarter-inch steel plate is 32 square feet, which at 10.2 lb/sq ft is about 326 pounds. Subtract the material in any holes or cut-outs before multiplying for a more exact weight.
Carbon steel plate weighs about 40.8 pounds per square foot for each inch of thickness. So common thicknesses work out to roughly 5.1 lb/sq ft at 1/8 inch, 10.2 lb/sq ft at 1/4 inch, 20.4 lb/sq ft at 1/2 inch, and 40.8 lb/sq ft at 1 inch.
This comes from steel’s density of about 0.2836 pounds per cubic inch, multiplied by 144 square inches in a square foot and the thickness in inches.
Stainless steel is very close to carbon steel, aluminum is about a third of these figures, and copper and brass are heavier, so always match the figure to your actual material.
The formula is weight = area x thickness x density. In US units, with the area in square inches, the thickness in inches, and the density in pounds per cubic inch, that gives the weight in pounds directly.
For a rectangle the area is length times width; for a round plate it is pi divided by four, times the diameter squared. Multiply the area by the thickness for the volume in cubic inches, then by the density for the weight.
A handy shortcut for steel is weight per square foot = 40.8 times the thickness in inches, since that folds in steel’s density and the 144 square inches per square foot.
Work out the material removed by each hole and subtract it from the solid plate. The area of one round hole is pi over four times its diameter squared; multiply by the number of holes to get the total hole area, then subtract that from the plate’s gross area before calculating the weight.
For example, four 7/8 inch anchor-bolt holes remove about 2.4 square inches in total — a small fraction of a large base plate, but worth subtracting on smaller parts or when there are many holes.
Keep in mind that your supplier usually charges for the full rectangle or circle blank, not the finished weight after holes, so use the gross weight for pricing and the net weight for lifting and shipping.
The most common US steel plate stock sizes are 48 by 96 inches (4 by 8 feet), 48 by 120 inches (4 by 10 feet), and 60 by 120 inches (5 by 10 feet), though mills and service centers carry many other widths and lengths.
Thickness is usually given as a fraction of an inch — 3/16, 1/4, 5/16, 3/8, 1/2 and up — with material thinner than about 3/16 inch generally called sheet rather than plate.
Buying a standard size and cutting from it is usually cheaper than ordering a custom blank, so it is worth laying out your parts on a standard sheet to minimize drops and waste.
The difference is thickness. Plate is the thicker, heavier flat material — generally about 3/16 inch and up for steel — used for structural parts, base plates, and heavy fabrication. Sheet is the thinner material below that, used for panels, ductwork, and light enclosures.
The weight formula is identical for both, since both are flat stock: area times thickness times density. Only the thickness, and therefore the weight per square foot, differs.
Sheet thickness is often specified by gauge number rather than a fraction, where a higher gauge means thinner material, while plate is almost always called out by its decimal or fractional thickness.
Aluminum weighs about one-third of steel for the same size. Aluminum’s density is roughly 0.098 pounds per cubic inch versus about 0.284 for steel, so an aluminum plate weighs only around 34 percent of a steel plate of identical dimensions.
That means a quarter-inch aluminum plate is about 3.5 pounds per square foot, compared with 10.2 for the same steel plate. This light weight is a big reason aluminum is used where handling, transport, or structural weight matters.
The plate dimensions stay the same across materials in this calculator — only the density changes — so you can switch the material to see the weight difference instantly.
Calculated weight uses nominal dimensions and a standard density, but real plate varies. Mills roll plate to a thickness tolerance and often supply it slightly over the nominal thickness — sometimes sold as overweight plate — which adds pounds.
Coatings such as galvanizing or paint add weight, and cut edges, mill scale, and the exact alloy or temper all shift the figure a little from the ideal calculation.
For estimating, ordering, and comparing options the calculated value is close enough, but for precise needs such as certified lift plans or exact freight, use the weight on the mill test report or your supplier’s published data.
Estimate only — confirm with your supplier. This calculator computes plate weight from nominal dimensions and typical material densities, using weight = net area × thickness × density (steel ≈ 0.2836 lb/in³, about 40.8 lb per square foot per inch), in US units. Real plate varies with mill thickness tolerance, overweight plate, coatings, cut edges, and the exact alloy or temper, any of which change the actual weight. The cost figure is a rough material estimate from the price per pound you enter and excludes cutting, fabrication, freight, and taxes; suppliers often charge for the full blank rather than the weight after holes. For ordering, certified lift plans, or exact freight, verify against the mill test report or your supplier’s published data. For planning purposes only.