Metal Plate Weight Calculator
The weight of a metal plate or sheet from its length, width and thickness — for steel, stainless, aluminium, copper and brass — with the weight per unit area, the total for a quantity, and the cost at a price per kilogram.
Weight is volume times density: length by width by thickness, times the material's mass per cubic meter.
How the metal plate weight calculator works
Weight is volume times density: length by width by thickness, times the material's mass per cubic meter. Mild steel is about 7,850 kg/m³, aluminium 2,700, copper 8,960 — so a sheet of aluminium weighs about a third of the same sheet in steel. Suppliers price plate by weight, which makes this the number behind every steel quote.
Formula: weight = length × width × thickness × density; per m² = thickness × density
Worked examples
| Inputs | Weight per plate (kg) | Note |
|---|---|---|
| A 2.4 × 1.2 m steel plate, 6 mm | 148.191 | about 136 kg |
| The same in aluminium | 50.97 | a third of the weight |
| Thin stainless sheet | — | under 30 kg |
FAQFrequently asked questions
How much does a steel plate weigh?
About 7.85 kg per square meter per millimeter of thickness — so a 2.4 × 1.2 m sheet of 6 mm plate is about 136 kg, and 10 mm plate 78.5 kg per square meter.
What densities does this use?
Mild steel 7,850 kg/m³, stainless 8,000, aluminium 2,700, copper 8,960, brass 8,500. Alloys vary by a per cent or two; enter a custom density for a specific grade.
Why is weight the thing to know?
Because plate is sold and shipped by weight, cranes and racks are rated by it, and a sheet that looks manageable at 3 mm is a two-person lift at 6.
Does this work for round or shaped plates?
Enter the bounding rectangle for a quick over-estimate, or the true area times thickness times density for the exact figure. The per-m² row gives the multiplier.
What about tube, bar and beam?
Same principle, different cross-section: multiply the section area by the length and the density. Section tables give the weight per meter directly.
Where these figures come from
- The Engineering ToolBox — material densities, coverage and unit data — bulk densities, concrete at 2,400 kg/m³, board and sheet sizes
- Gypsum Association — gypsum board sizes — 4 × 8 and 4 × 12 ft sheets
- ADA Standards for Accessible Design — ramps (§405) — maximum running slope 1:12
- International Code Council — the International Residential Code
Last checked: September 2026. Coverage rates and material sizes are typical manufacturer figures — check the product you buy.