Material weight calculator

Weight equals volume multiplied by density. For a rectangular block it is length times width times thickness. For a round bar it is pi times the radius squared times the length. For a tube it is pi multiplied by the outer radius squared minus the inner radius squared, all times the length, and everything must be in the same unit as the density.

2700 kg/m³ for the common 6061-T6 and 6061-O conditions. Use 2810 kg/m³ for 7075-T6 and about 2680 kg/m³ for 5052-H32. Always check the temper, because the difference between the tempers of one alloy is small but it is still a real difference on a weight-critical part.

Yes. Nylon and PET change noticeably with humidity, and the effect is measured in per cent, not per thousand. PA6 in a humid environment can be several per cent heavier than the dry value in the table. For a part where the weight matters, ask for a conditioned material and state the conditioning on the drawing.

Use the difference between the outer and the inner circle areas: pi multiplied by (OD squared minus ID squared) divided by four, multiplied by the length. For the same material a tube is always lighter than a solid bar of the same outer diameter, which is worth checking when a design is close to a weight limit.

The nominal densities in the table are accurate to roughly plus or minus one per cent, which is the level the standards guarantee. The real part also carries a tolerance from machining, coating and plating, so the calculated weight is a reference and the measured weight is the one that goes on the invoice.

Yes, and it is usually small but it is not zero. Anodising adds a thin oxide layer, while electroless nickel, zinc plating and powder coating add more, and powder coating adds a noticeable amount because it is thick. For a weight-critical part, state the coating and whether the weight is before or after coating.