Concrete calculator: cement bags, sand and ballast
Set the size of a slab, footing, column or beam and choose a nominal mix: the concrete volume, bags of cement, sand, ballast and water are worked out by the dry-volume method.
Works in metric or imperial units.
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Questions students ask
How many bags of cement are in a cubic metre of 1:2:4 concrete?
About 6.3 bags of 50 kg: dry volume 1.54 m³, one seventh of it cement, at 1440 kg/m³.
Why multiply by 1.54?
Dry materials shrink in volume when mixed with water and compacted, so about 54% more dry material is needed than the volume of wet concrete.
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