Sheet metal weight calculator for plates and sheets
This sheet metal weight calculator works out the weight of a sheet or plate from its length, width and thickness — or from a gauge number — for mild steel, galvanised steel, stainless steel 304 and 316, aluminium, copper and brass. Enter the size in millimetres, metres, inches or feet and it gives the weight of one piece and of the whole order in kilograms, pounds and tonnes, plus kg per m², lb per ft² and a cost if you enter a price.
Fabricators, students, purchase teams and anyone checking a delivery use it as an MS plate weight calculator in kg, to convert a gauge to mm, or to compare an aluminium sheet with a steel one. The gauge chart under the calculator lists every gauge of the chosen system with its thickness and the weight per m², per ft² and for your sheet size.
Everything is calculated in your browser as you type. The answers are theoretical weights from nominal dimensions; real sheets are rolled within thickness tolerances, so use the mill certificate or a weighbridge for billing.
How to use the Sheet Metal & Plate Weight Calculator
- Choose Sheet / plate or Circle / disc, and the unit you measure the size in.
- Pick the material. The density fills in automatically; type your own for another alloy.
- Enter the length and width (or pick a standard sheet size such as 2500 × 1250 mm or 8 × 4 ft), or the diameter, and the number of pieces.
- Give the thickness in mm or inches, or choose Gauge number and the gauge system your supplier quotes.
- Add a price per kg, tonne or lb if you want a cost, then copy the summary or download the gauge chart as CSV.
Sheet Metal & Plate Weight Calculator features
Five gauge systems
Manufacturers' Standard Gauge for sheet steel, galvanised sheet gauge, US Standard Gauge (1893), British SWG and Brown & Sharpe / AWG.
Seven materials
MS, GI, SS 304, SS 316, aluminium, copper and brass with typical densities, or any density you type.
Plates and discs
Rectangular sheets and plates with standard size presets, and circular blanks by diameter.
Every unit
Sizes in mm, m, inches or feet; results in kg, lb and tonnes, with kg/m² and lb/ft².
Live gauge chart
The chart follows your material and density and shows the weight of your sheet size at every gauge.
Plate weight formula, with a worked example
Weight = length × width × thickness × density. With sizes in metres and density in kg/m³ the answer is in kilograms. A handy shortcut for steel: kg per m² = thickness in mm × 7.85.
Worked example: an MS plate 2500 × 1250 × 10 mm is 2.5 × 1.25 × 0.010 = 0.03125 m³. At 7,850 kg/m³ it weighs 0.03125 × 7,850 = 245.31 kg, which is 78.5 kg per m². The same sheet in aluminium (2,700 kg/m³) weighs 84.4 kg — about a third of the steel.
An 8 × 4 ft sheet of 16 gauge mild steel (0.0598 in, 1.519 mm) covers 2.973 m² and weighs about 35.4 kg, or 78 lb. In 18 SWG (1.219 mm), the usual Indian GI sheet thickness for ducting and covers, it weighs about 28.5 kg.
Common gauges in mm
Gauge numbers mean different thicknesses in different systems, which is why the calculator asks for the system. Values below are nominal.
| Gauge | MSG steel | Galvanised | SWG | AWG (aluminium) |
|---|---|---|---|---|
| 10 | 3.416 mm | 3.510 mm | 3.251 mm | 2.588 mm |
| 12 | 2.657 mm | 2.753 mm | 2.642 mm | 2.052 mm |
| 14 | 1.897 mm | 1.994 mm | 2.032 mm | 1.628 mm |
| 16 | 1.519 mm | 1.613 mm | 1.626 mm | 1.290 mm |
| 18 | 1.214 mm | 1.311 mm | 1.219 mm | 1.024 mm |
| 20 | 0.912 mm | 1.006 mm | 0.914 mm | 0.813 mm |
| 22 | 0.759 mm | 0.853 mm | 0.711 mm | 0.643 mm |
| 24 | 0.607 mm | 0.701 mm | 0.559 mm | 0.511 mm |
Densities used and where the gauges come from
- Steel 7,850 kg/m³ is the value IS 1786 and most steel tables use; stainless 304 is taken as 7,930 and 316 as 7,980 kg/m³, aluminium 2,700, copper C11000 8,890 and brass C26000 8,530. Published figures differ by about 1% between sources and alloys, so the field stays editable.
- The Manufacturers' Standard Gauge and galvanised gauge are the values tabulated in Machinery's Handbook; the US Standard Gauge is the 1893 weight-based gauge in 15 U.S.C. § 206; SWG is the British Imperial Standard Wire Gauge of 1883 (BS 3737); AWG thicknesses are calculated from the Brown & Sharpe definition d = 0.005 × 92(36 − n)/39 in. Tables checked on 19 October 2026.
- Galvanised weights ignore the zinc coating, which adds a little; coated sheet is often sold by actual weighed mass.
- Need bars, pipes or sections instead? Use the steel weight calculator for TMT and rebar and the pipe weight calculator for MS and GI pipes. Convert results with the weight converter.
Sheet Metal & Plate Weight Calculator FAQ
How do I calculate MS plate weight in kg?
Multiply length × width × thickness in metres by 7,850. For a quicker check, thickness in mm × 7.85 gives kg per m². A 6 mm plate weighs 47.1 kg/m², so a 2500 × 1250 mm sheet weighs 147.2 kg. This sheet metal weight calculator does it for any size.
What is sheet metal weight by gauge?
Look up the gauge thickness in the right system, then multiply by area and density. 16 gauge mild steel (MSG) is 1.519 mm thick and weighs about 11.9 kg/m²; 16 gauge aluminium (AWG) is 1.29 mm and weighs about 3.5 kg/m².
How do I calculate the weight of an aluminium sheet?
Use the same formula with 2,700 kg/m³: an 8 × 4 ft (2440 × 1220 mm) aluminium sheet 2 mm thick weighs 2.44 × 1.22 × 0.002 × 2,700 = 16.07 kg.
Is 18 gauge the same in every system?
No. 18 gauge is 1.214 mm in the Manufacturers' Standard Gauge, 1.311 mm for galvanised sheet, 1.219 mm in SWG and 1.024 mm in AWG. Always ask which gauge system the supplier uses, or order by mm.
What is the weight of an 8 × 4 ft MS sheet?
It depends on thickness: about 23.3 kg per mm of thickness for a 2440 × 1220 mm sheet. A 1 mm sheet weighs 23.4 kg, 2 mm 46.7 kg and 3 mm 70.1 kg.
Why is my weighed sheet heavier than the calculation?
Sheets are rolled within thickness tolerances and often on the plus side, galvanised sheet carries zinc, and stainless densities vary slightly by grade. The calculation is the theoretical nominal weight.