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How much concrete for a slab, base or footing, in cubic metres, 25 kg bags, or how much ready-mix to order. Free, instant.
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Roughly 100 × 25 kg bags of ready-mixed concrete per m³ — the calculator uses the bag yield you enter.
Should I order extra ready-mix?Yes — 5–10% for uneven ground and spillage. It's added by default.
Does it do footings?Enter length, width and depth of the trench and it works the same way.