This free metal weight calculator works as a steel weight calculator, MS plate & sheet weight calculator, round bar weight calculator, stainless steel (SS304 / SS316) weight calculator, and aluminium, brass & copper weight calculator — for sheet, round bar, square bar, rectangular bar and hex bar. Enter dimensions in mm, cm, metre, inch or foot and read the weight in kg, grams, tonnes, pounds or ounces.
How to use the metal weight calculator
Four steps, no sign-up:
- Pick a shape — sheet/plate, round bar, square bar, rectangular bar or hex bar. The diagram updates to show which dimension is which.
- Choose the material and grade — from mild steel and stainless steel to aluminium, brass, copper, cast iron, titanium and engineering plastics. The correct density fills in automatically.
- Enter the dimensions and quantity in your preferred unit (mm, cm, m, inch or foot).
- Read the weight in kg, grams, tonnes, pounds or ounces — and add several items to an estimate to get the total weight.
The formula behind it
Every result comes from the same physics: weight = volume × density. We compute the volume from the shape’s dimensions (converted to millimetres), convert mm³ to m³ by dividing by 1,000,000,000, then multiply by the material density in kg/m³ and the quantity.
| Shape | Inputs | Volume formula |
|---|---|---|
| Sheet / Plate | Length, Width, Thickness | L × W × T |
| Round Bar | Diameter, Length | (π × D² / 4) × L |
| Square Bar | Side, Length | Side² × L |
| Rectangular Bar | Length, Width, Height | L × W × H |
| Hex Bar | Across flats (A/F), Length | (√3 / 2) × AF² × L |
Material density reference (kg/m³)
These are the standard reference densities used by the calculator. Actual weight varies slightly with alloy composition, temper and rolling tolerance.
| Material | Common grades | Density (kg/m³) |
|---|---|---|
| Mild Steel | IS2062 E250 / E350 | 7850 |
| Carbon Steel | C20, C45, EN8 | 7850 |
| Stainless Steel | SS304 7930 · SS316 8000 · SS202 7780 | 7780–8000 |
| Aluminium | 1100, 6061, 6082, 7075 | 2700–2810 |
| Brass | IS319 | 8500 |
| Copper | ETP | 8930 |
| Cast Iron | Gray / Ductile | 7100–7300 |
| Titanium | Grade 2 / Grade 5 | 4430–4500 |
| Bronze | Phosphor / Gunmetal | 8650–8800 |
| Tool Steel | H13, D2, EN31 | 7700–7810 |
| Engineering plastics | PP, PVDF, PTFE, Nylon, HDPE | 910–2140 |
From estimate to invoice — automatically
A weight calculator answers one question. Running a factory means asking it a hundred times a day — on every raw-material purchase, every job-work challan, every customer quote. Inside OEMup ERP this same weight engine is built right into the item master: the calculated weight flows into per-kg costing, stock valuation, BOM rollups and GST invoices — no re-keying, no spreadsheet drift. It’s especially handy for fabrication & sheet-metal shops and pump & valve manufacturers costing parts by weight.
Metal Weight Calculator — frequently asked questions
How do you calculate the weight of metal?
Weight = volume × density. Work out the volume of the shape, convert it to cubic metres, and multiply by the material’s density in kg/m³ (mild steel is 7850). This tool does all of it the moment you enter the dimensions.
What is the density of mild steel and stainless steel?
Mild steel (IS 2062) is about 7850 kg/m³. Stainless steel depends on grade — SS304 about 7930, SS316 about 8000, SS202 about 7780 kg/m³.
Which shapes are supported?
Sheet/plate, round bar, square bar, rectangular bar and hex bar — with dimension input in mm, cm, m, inch or foot, a quantity field, and results in kg, g, tonne, lb or oz. You can also add multiple items to an estimate and see the total weight.
Is the calculator free?
Yes, completely free and no sign-up. It is the same engine inside OEMup ERP, where the weight feeds straight into costing and GST invoices.
Need more shop-floor tools? Browse all free calculators, or try the Pipe Weight Calculator, the Tank Volume Calculator and the Fabrication Cost Calculator.
Stop weighing in spreadsheets
OEMup turns raw-material weight into costing, stock value and GST invoices automatically — built for Indian manufacturing SMEs.
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