Concrete Calculator (Volume & Bags)
Enter the slab size to get the volume in cubic metres and the number of bags.
How much concrete do I need?
Volume is length × width × depth. A 3 × 2 m slab 100 mm deep is 0.6 m³; with 10% extra that is 0.66 m³, about 53 bags of 25 kg mix.
Planning materials? See the Tile Calculator.
Frequently asked questions
How many bags of concrete make a cubic metre?
Roughly 80 bags of 25 kg ready-mixed dry concrete, depending on the mix.
How deep should a concrete slab be?
Paths 75–100 mm, patios and sheds 100 mm, driveways 100–150 mm.
Why add extra?
Uneven ground and spillage use more than the sum of the dimensions.
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