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lightweight concrete slab weight calculator

Enter the dimensions of a lightweight concrete slab and this works out its volume and weight. Expanded-aggregate structural lightweight concrete. Aerated block is far lower.

Total weight
10.8kg
= Exact lightweight concrete slab weight
Weight of one slab
10.8
Volume of one piece
6000
Density used
1800 kg/m3
Show the working
  1. Length = 2000
  2. Width = 1000
  3. Thickness = 3
  4. Number of pieces = 1
  5. volume_mm3 = 2000 * 1000 * 3 = 6 000 000
  6. Volume of one piece = 6 000 000 / 1000 = 6000
  7. Density used = 1800 = 1800
  8. Weight of one slab = 6 000 000 * 1800 / 1e9 = 10.8
  9. Total weight = 10.8 * 1 = 10.8

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 = length x width x thickness
    • Weight = volume x density, with density = 1800 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.

    Expanded-aggregate structural lightweight concrete. Aerated block is far lower.

    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 lightweight concrete?

    1800 kg/m3, which is 1.800 g/cm3. Expanded-aggregate structural lightweight concrete. Aerated block is far lower.

    How do you calculate the weight of a lightweight concrete slab?

    Volume = length x width x thickness. Multiply the volume by the density of lightweight concrete, 1800 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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