The calculation, without hidden assumptions
Estimate a solid rectangular plate from transparent volume × density physics. Switch common metals or enter a verified custom density, then audit batch mass, area loading, optional material cost, target thickness and measured-weight variance.
How to use this calculator
Choose the dimension and output-weight units used on your drawing or stock list.
Select a nominal material density or choose Custom and enter density from your material data.
Enter finished plate length, width and thickness; use quantity for identical pieces.
Optionally enter price per kilogram for raw-material planning.
Optionally enter a target weight to reverse-solve thickness or a measured plate weight to audit effective density.
Where people use it
- •Estimate mild-steel plate mass before purchasing or transport planning.
- •Compare steel, stainless, aluminum, copper, brass and titanium plate weights for the same envelope.
- •Calculate total batch tonnage for identical blanks.
- •Reverse-size nominal thickness for a target mass before checking available stock gauges.
- •Compare a measured plate against nominal geometry and density without silently changing the planning result.
1,000 × 500 × 12 mm carbon-steel plate
At the nominal carbon-steel density of 7,850 kg/m³, a 1,000 × 500 × 12 mm solid plate has 0.006 m³ volume and weighs 47.10 kg. Ten identical plates weigh 471.0 kg before packaging.
What the result does not assume
- •Density presets are nominal planning values, not grade certificates. Exact alloy chemistry and temperature can shift density.
- •The solid-plate model does not subtract holes, slots, bevels or other cutouts. Model those separately when their volume is material.
- •Coatings, galvanizing, scale, protective film and attached hardware are excluded unless represented in measured mass.
- •Nominal thickness can differ from measured thickness within manufacturing tolerances; do not invent a universal tolerance.
- •For cranes, hoists, racks, structural loads or freight declarations, verify the actual product specification and measured mass.
Frequently asked questions
How do I calculate steel plate weight?+
Convert dimensions to consistent units, multiply length × width × thickness for volume, then multiply by the steel density. MAXScanner shows the substituted calculation rather than hiding it behind a shortcut constant.
What density does the calculator use for carbon steel?+
The carbon-steel preset uses a nominal 7,850 kg/m³. For a grade where the supplier publishes a different value, choose Custom and enter that verified density.
Can I calculate aluminum plate weight?+
Yes. Select Aluminum 6061 for the nominal 2,700 kg/m³ preset, or use Custom for another alloy density from its material data.
Does this include holes or cutouts?+
No. The owner models a solid rectangular plate. Subtract the verified volume and mass of holes or cutouts separately when they are significant.
Can I calculate thickness from a target weight?+
Yes. Enter a target plate weight and the calculator reverse-solves thickness using the selected material density and entered face dimensions.
Why might the actual plate weight differ?+
Actual dimensions, alloy density, mill tolerances, coatings and cut features can all differ from nominal inputs. The optional measured-weight diagnostic shows the effective density implied by your measurements without overwriting nominal math.
Semantic next steps
Continue the calculation
These links move to a different input, formula or project stage rather than a keyword variation of this page.
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Keep the result connected to the real job
MAXScanner keeps the formula and assumptions beside the result so you can verify the number before using it in a drawing, estimate, specification, worksheet or document. Where a supplier, manufacturer, drawing or applicable standard owns a requirement, that source remains authoritative.