Metal Weight Calculator
This metal weight calculator finds the weight of steel, aluminum, and other metals from the dimensions. Enter the shape, material, and size and the metal weight calculator returns the weight in kilograms and pounds. It works as a steel weight calculator, an aluminum weight calculator, and a metal plate weight calculator.
Results
The Metal Weight Calculator is part of our Weight collection. Browse more weight to size, convert, and check your work alongside this tool.
What the metal weight calculator does
The metal weight calculator turns dimensions into weight for the shapes and metals you use most. Because metal is priced and shipped by weight, this material weight calculator gives the number that drives both the quote and the freight. Pick a shape and material and the metal weight calculator uses standard densities, working equally as a steel weight calculator, aluminum weight calculator, or metal plate weight calculator.
Metal weight formula
The metal weight calculator multiplies volume by density:
Volume depends on the shape, and the formula for steel weight uses a density of 7.85 g/cm³. Aluminum is 2.70 and copper 8.96, which is why the steel weight calculator and aluminum weight calculator give very different results for the same size.
Metal weight calculator example
A steel plate 1000 × 100 × 5 mm through the steel plate weight calculator:
Switch to the aluminum weight calculator and the same plate drops to about 1.35 kg.
How to use the metal weight calculator
Choose the shape and the material, then enter the dimensions in millimeters. For a plate enter length, width, and thickness; for a round bar enter length and diameter to calculate round bar weight; for sheet use the sheet metal weight calculator inputs. The metal weight calculator returns the weight in kilograms and pounds with the volume.
Reading the metal weight calculator result
Use the weight for material cost, transport, and structural self-weight. Multiply by the price per kilogram to quote material. Real bars vary slightly from the metal weight calculator result because of rolling tolerances and alloy differences, but for ordering and costing those differences are negligible.
When to use the metal weight calculator
- Quoting a fabrication job by weight with the material weight calculator
- Finding steel section weight with the steel weight calculator
- Weighing sheet with the sheet metal weight calculator
- Calculating round bar weight for stock orders
Common metal weight mistakes
- Using radius as diameter. Enter the full diameter; the metal weight calculator halves it.
- Wrong material. Copper weighs over three times aluminum for the same size.
- Mixing units. Keep dimensions in millimeters for the material weight calculator.
Tips for accurate metal weight results
- Confirm the alloy density for an exact calculation.
- Add for coatings and fittings when planning transport.
- Cross-check the metal weight calculator against a manufacturer weight table.
Density and the metal weight calculator
Density is the property that makes the metal weight calculator work, and it varies more than people expect. Aluminum at 2.70 is prized wherever weight matters; steel at 7.85 gives the mass and stiffness structures need; copper and brass are heavier still. Because the metal weight calculator squares the effect of some dimensions through area, selecting the right material is the single biggest factor in the result, which is why the steel weight calculator and aluminum weight calculator diverge so sharply.
Why shape drives the metal weight
The metal weight calculator treats plate, bar, and tube separately because cross-section governs weight. A solid round bar holds metal through its center, while a tube of the same outside diameter is hollow and can weigh a quarter as much. This is the whole principle of tubular construction, and seeing it when you calculate round bar weight versus tube weight explains why engineers reach for hollow sections that give strength without the dead weight of solid stock.
Metal density chart
Densities used by the metal weight calculator:
| Material | Density (g/cm³) |
|---|---|
| Aluminum | 2.70 |
| Steel | 7.85 |
| Brass | 8.50 |
| Copper | 8.96 |
Metal Weight Calculator FAQ
How do I calculate metal weight?
Multiply the volume by the density. The metal weight calculator does this: a steel plate 1000 × 100 × 5 mm weighs 3.925 kg. The formula for steel weight uses a density of 7.85 g/cm³.
How do I calculate round bar weight?
Find the volume with π × r² × length, then multiply by the density. The metal weight calculator does this to calculate round bar weight in kg and lb.
What is the density of steel?
About 7.85 g/cm³ for mild steel, which the steel weight calculator uses. Aluminum is 2.70, so the aluminum weight calculator gives roughly a third of the weight.
Does the metal weight calculator handle sheet?
Yes. Enter the sheet length, width, and thickness and the sheet metal weight calculator returns its weight, the same way it handles plate.