plaster slab weight calculator

Enter the dimensions of a plaster slab and this works out its volume and weight. Set gypsum plaster.

Length

Width

Thickness

Number of pieces

Total weight

5.1kg

= Exact plaster slab weight Show in

Weight of one slab: 5.1
Volume of one piece: 6000
Density used: 850 kg/m3

Show the working

Length = 2000
Width = 1000
Thickness = 3
Number of pieces = 1
volume_mm3 = 2000 * 1000 * 3 = 6 000 000
Volume of one piece = 6 000 000 / 1000 = 6000
Density used = 850 = 850
Weight of one slab = 6 000 000 * 850 / 1e9 = 5.1
Total weight = 5.1 * 1 = 5.1

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 = 850 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.

Set gypsum plaster.

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 plaster?

850 kg/m3, which is 0.850 g/cm3. Set gypsum plaster.

How do you calculate the weight of a plaster slab?

Volume = length x width x thickness. Multiply the volume by the density of plaster, 850 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.