cobalt square tube weight calculator

Enter the dimensions of a cobalt square tube and this works out its volume and weight. Pure cobalt.

Outside side

Wall thickness

Length

Number of pieces

Total weight

5.0196kg

= Exact cobalt square tube weight Show in

Weight of one square tube: 5.0196
Volume of one piece: 564
Weight per metre of length: 5.0196 kg/m
Density used: 8900 kg/m3

Show the working

Outside side = 50
Wall thickness = 3
Length = 1000
Number of pieces = 1
volume_mm3 = (50^2 - (50 - 2*3)^2) * 1000 = 564 000
Volume of one piece = 564 000 / 1000 = 564
Density used = 8900 = 8900
Weight of one square tube = 564 000 * 8900 / 1e9 = 5.0196
Total weight = 5.0196 * 1 = 5.0196
Weight per metre of length = 564 000 / 1000 * 1000 * 8900 / 1e9 = 5.0196

Values are shown to six significant figures here; the arithmetic itself runs on exact fractions and is only rounded where a number is printed.

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The formula

Volume = (side^2 - inner side^2) x length, ignoring the corner radii
Weight = volume x density, with density = 8900 kg/m3
One cubic millimetre of a material at 1000 kg/m3 weighs exactly one milligram, so the millimetre-to-kilogram step is a shift of the decimal point rather than a rounded factor.

Pure cobalt.

Dimensions are nominal. Mill tolerances on thickness, and the corner radii on formed sections, both move the real weight by a percent or two.

Every field takes inches or feet as readily as millimetres: change the unit next to it and the conversion is done exactly before the arithmetic starts.

Frequently asked

What is the density of cobalt?

8900 kg/m3, which is 8.900 g/cm3. Pure cobalt.

How do you calculate the weight of a cobalt square tube?

Volume = (side^2 - inner side^2) x length, ignoring the corner radii. Multiply the volume by the density of cobalt, 8900 kg/m3, taking care that both are in the same unit system.

Can I enter dimensions in inches?

Yes. Each dimension field has its own unit selector, and inch, foot, millimetre, centimetre and metre entries are all converted exactly before anything is multiplied.

Where the numbers come from

Densities are nominal room-temperature values for the grade named, drawn from the usual mill and handbook figures.