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PLA rod weight calculator

Enter the dimensions of a PLA rod and this works out its volume and weight. Solid polylactic acid. A 3D print at less than 100% infill weighs proportionally less.

Total weight
0.608 684kg
≈ Rounded PLA rod weight
Weight of one rod
0.608 684
Volume of one piece
490.874
Weight per metre of length
0.608 684 kg/m
Density used
1240 kg/m3
Show the working
  1. Diameter = 25
  2. Length = 1000
  3. Number of pieces = 1
  4. volume_mm3 = pi * (25/2)^2 * 1000 = 490 874
  5. Volume of one piece = 490 874 / 1000 = 490.874
  6. Density used = 1240 = 1240
  7. Weight of one rod = 490 874 * 1240 / 1e9 = 0.608 684
  8. Total weight = 0.608 684 * 1 = 0.608 684
  9. Weight per metre of length = 490 874 / 1000 * 1000 * 1240 / 1e9 = 0.608 684

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 = pi x (diameter / 2)^2 x length
    • Weight = volume x density, with density = 1240 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.

    Solid polylactic acid. A 3D print at less than 100% infill weighs proportionally less.

    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 PLA?

    1240 kg/m3, which is 1.240 g/cm3. Solid polylactic acid. A 3D print at less than 100% infill weighs proportionally less.

    How do you calculate the weight of a PLA rod?

    Volume = pi x (diameter / 2)^2 x length. Multiply the volume by the density of PLA, 1240 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.

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