HDPE rod weight calculator

Enter the dimensions of a HDPE rod and this works out its volume and weight. High-density polyethylene. Just under the density of water, so it floats.

Diameter

Length

Number of pieces

Total weight

0.466 33kg

≈ Rounded HDPE rod weight Show in

Weight of one rod: 0.466 33
Volume of one piece: 490.874
Weight per metre of length: 0.466 33 kg/m
Density used: 950 kg/m3

Show the working

Diameter = 25
Length = 1000
Number of pieces = 1
volume_mm3 = pi * (25/2)^2 * 1000 = 490 874
Volume of one piece = 490 874 / 1000 = 490.874
Density used = 950 = 950
Weight of one rod = 490 874 * 950 / 1e9 = 0.466 33
Total weight = 0.466 33 * 1 = 0.466 33
Weight per metre of length = 490 874 / 1000 * 1000 * 950 / 1e9 = 0.466 33

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

Scenarios & local history

Compare a saved scenario

Recent calculations

The formula

Volume = pi x (diameter / 2)^2 x length
Weight = volume x density, with density = 950 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.

High-density polyethylene. Just under the density of water, so it floats.

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 HDPE?

950 kg/m3, which is 0.950 g/cm3. High-density polyethylene. Just under the density of water, so it floats.

How do you calculate the weight of a HDPE rod?

Volume = pi x (diameter / 2)^2 x length. Multiply the volume by the density of HDPE, 950 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.