0 m³ concrete
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Cubic feet
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Cement (50kg bags)
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Sand (m³)
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Aggregate (m³)
Material estimates include a ~54% dry-volume allowance and are indicative — add 5–10% wastage when ordering.
Frequently Asked Questions
How much concrete do I need?
Multiply length × width × thickness (all in the same unit) to get the wet volume. The calculator converts to cubic metres and estimates cement bags, sand and aggregate for the chosen nominal mix, including a dry-volume allowance.
Work out the concrete volume for a slab and estimate cement, sand and aggregate.