How much concrete for a 12×24 slab 6 inches thick?
Answer
5.33 cubic yards
200 bags of 80lb concrete mix320 bags of 60lb mixOrder ready-mix delivery (~$800)Add 10% for waste = 5.86 cy
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How We Calculated This
Cubic yards = (L × W × D/12) / 27
(24 × 12 × 6/12) / 27 = 144.00 / 27 = 5.33 cubic yards
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Calculated using verified formulas. Last updated March 2026.