ductile iron hex bar weight calculator

Enter the dimensions of a ductile iron hex bar and this works out its volume and weight. Spheroidal graphite iron, lighter than gray iron because the graphite is nodular.

Across flats

Length

Number of pieces

Total weight

3.842 99kg

≈ Rounded ductile iron hex bar weight Show in

Weight of one hex bar: 3.842 99
Volume of one piece: 541.266
Weight per metre of length: 3.842 99 kg/m
Density used: 7100 kg/m3

Show the working

Across flats = 25
Length = 1000
Number of pieces = 1
volume_mm3 = sqrt(3)/2 * 25^2 * 1000 = 541 266
Volume of one piece = 541 266 / 1000 = 541.266
Density used = 7100 = 7100
Weight of one hex bar = 541 266 * 7100 / 1e9 = 3.842 99
Total weight = 3.842 99 * 1 = 3.842 99
Weight per metre of length = 541 266 / 1000 * 1000 * 7100 / 1e9 = 3.842 99

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 = (sqrt(3) / 2) x across-flats^2 x length
Weight = volume x density, with density = 7100 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.

Spheroidal graphite iron, lighter than gray iron because the graphite is nodular.

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 ductile iron?

7100 kg/m3, which is 7.100 g/cm3. Spheroidal graphite iron, lighter than gray iron because the graphite is nodular.

How do you calculate the weight of a ductile iron hex bar?

Volume = (sqrt(3) / 2) x across-flats^2 x length. Multiply the volume by the density of ductile iron, 7100 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.