How much concrete for a 12×24 slab 8 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 × 12 × 8/12) / 27 = 192.00 / 27 = 7.11 cubic yards
Related Calculations
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Calculated using verified formulas. Last updated March 2026.