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Concrete

Work out the concrete volume for a slab or footing and the bags of pre-mix.

Length

m

Width

m

Thickness

cm

Waste

%

Bag yield

m³

Volume (with waste)2.10 m³

Net volume2.00 m³

Bags117

Bag yield varies by product (e.g. 40kg ≈ 0.018 m³).

Breakdown

Net volume	2.00 m³
Waste	0.10 m³
Total	2.10 m³
Bags	117

How it works

Calculate the concrete volume needed for slabs, foundations and other rectangular projects, including an estimate of bags.

Frequently asked questions

How is concrete volume calculated?

For a rectangular project, multiply length, width and depth.

How many bags are needed?

The number depends on each bag yield and is rounded up.

Should I allow extra?

Yes, a small allowance covers waste and uneven surfaces.