steel plate weight calculator
This calculator multiplies thickness × width × length to obtain volume, then multiplies volume by density. Millimetres are converted to metres inside the formula. The result is an estimate for a rectangular solid plate.
ArcelorMittal’s Orange Book uses 7,850 kg/m³ when calculating steel section masses. Actual mass can differ because of grade, dimensional tolerances, coatings, cut-outs, holes, edge preparation, and scale accuracy.
Enter plate dimensions
Formula and worked example
Formula
Weight (kg) = thickness (mm) × width (mm) × length (mm) × density (kg/m³) × 10⁻⁹ × quantity.
Example
A 2 mm × 1,000 mm × 2,000 mm plate at 7,850 kg/m³ weighs an estimated 31.4 kg.
Density
The 7,850 kg/m³ default is a conventional steel assumption. Replace it when the material certificate uses another density.
Procurement use
Use the estimate for planning and RFQs, then reconcile it with supplier documents and actual delivered mass.
Limits of a dimensional estimate
- Thickness and width tolerances can change actual volume.
- Coatings, mill scale, holes, slots, chamfers, and profiles are not modelled.
- Different alloys can use different densities.
- The tool does not calculate price, payload legality, lifting method, or structural capacity.
- Use certified product data and measured mass for controlled engineering decisions.
Use the estimate without hiding assumptions
Keep dimensions and density at full precision during calculation, then round only the displayed result. For multiple plate sizes, calculate each line separately before summing the order. Dividing total kilograms by 1,000 gives metric tonnes, but that conversion does not add transport, packaging, pallet, or handling mass.
A procurement schedule should retain thickness, width, length, quantity, density assumption, and calculation date beside the estimate. Compare the result with supplier documents and investigate material differences before approving freight or lifting plans. Payload, axle load, lifting capacity, and structural checks require separate qualified review.
Technical note
Planning estimate only. Verify material density, tolerances, delivered mass, lifting plan, and vehicle limits with qualified parties.
Technical source: ArcelorMittal Orange Book — Dimensions of sections.
Frequently asked questions
Why is 7,850 kg/m³ used?
It is a conventional steel density assumption used by ArcelorMittal for calculated section masses. The input remains editable.
Does this calculate stainless or aluminium?
It can estimate any rectangular plate if you enter the appropriate material density.
Can the result be used as certified weight?
No. Use supplier certificates, calibrated measurement, and applicable logistics or engineering rules for controlled decisions.