How much concrete for a 10×20 slab 4 inches thick?
Answer
2.47 cubic yards
93 bags of 80lb concrete mix149 bags of 60lb mix~$371 for ready-mix
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How We Calculated This
Cubic yards = (L × W × D/12) / 27
(20 × 10 × 4/12) / 27 = 66.67 / 27 = 2.47 cubic yards
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Calculated using verified formulas. Last updated March 2026.