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How much concrete for a 24×24 slab 4 inches thick?

Answer
7.11 cubic yards
267 bags of 80lb concrete mix427 bags of 60lb mixOrder ready-mix delivery (~$1,067)Add 10% for waste = 7.82 cy

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How We Calculated This

Cubic yards = (L × W × D/12) / 27

(24 × 24 × 4/12) / 27 = 192.00 / 27 = 7.11 cubic yards

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Calculated using verified formulas. Last updated March 2026.