How do I calculate the weight of a metal blank?

Weight is volume multiplied by density. For a rectangular plate the volume is length times width times thickness; for round bar it is pi divided by four times the diameter squared times the length. Convert to consistent units first, then multiply by the density of the alloy.

What is the density of aluminium 6061?

Aluminium 6061 has a density of about 2.70 g/cm3, or 2,700 kg/m3. Grade 7075 is slightly heavier at about 2.81 g/cm3. The difference is small enough that grade choice is almost never driven by weight.

How much heavier is steel than aluminium?

Mild steel and stainless steel sit around 7.85 to 8.00 g/cm3, so roughly three times the density of aluminium. A steel part with identical geometry to an aluminium one therefore weighs about three times as much, which is why weight-sensitive designs move to aluminium or titanium.

Does this calculator include the material removed during machining?

No. It gives the weight of the blank as ordered. Finished part weight is lower by whatever is machined away, which on a part machined from plate can be a large share of the starting mass. Use the blank weight for shipping and handling, and the finished weight for the part itself.

Metal & Plastic Weight Calculator

Work out what a blank weighs before it is cut, for plate, round bar, tube and hex bar. Useful for shipping estimates, fixture loading and comparing material options.

Blank and material

Stock form

Material

Length (mm)

Width (mm)

Plate only

Thickness / wall (mm)

Plate thickness, or tube wall

Diameter (mm)

Round or hex bar, or tube outside diameter

Quantity

Calculated in your browser using standard handbook densities. Blank weight only — it does not account for material removed during machining.

Result

Volume per blank—Weight per blank—Weight, all blanks—In kilograms—In pounds—Density used—

Plate: V = L × W × T. Round bar: V = π/4 × D² × L. Tube: V = π/4 × (D² − (D − 2t)²) × L. Hex bar: V = 0.866 × D² × L. Weight = volume × density.

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Reference

Densities used in this calculator

Material	Density (g/cm³)	kg/m³	Relative to aluminium
Aluminium 6061	2.70	2700	1.00
Aluminium 7075	2.81	2810	1.04
Mild steel	7.85	7850	2.91
Stainless steel 304	8.00	8000	2.96
Stainless steel 316	8.00	8000	2.96
Stainless 17-4 PH	7.80	7800	2.89
Titanium Ti-6Al-4V	4.43	4430	1.64
Brass C360	8.49	8490	3.14
Copper C110	8.94	8940	3.31
POM / Delrin	1.41	1410	0.52
PEEK	1.32	1320	0.49
Nylon	1.14	1140	0.42
Polycarbonate	1.20	1200	0.44
PTFE	2.16	2160	0.80
ABS	1.04	1040	0.39

Values are typical handbook figures for the wrought material. Cast or sintered versions of the same alloy can differ, and filled or glass-reinforced plastics vary more than the base polymer.

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Basis & references: MatWeb — material property database · NIST — Material measurement laboratory

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