How much concrete for a 4×12 slab 6 inches thick?
Answer
0.89 cubic yards
34 bags of 80lb concrete mix54 bags of 60lb mix~$134 for ready-mix
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How We Calculated This
Cubic yards = (L × W × D/12) / 27
(12 × 4 × 6/12) / 27 = 24.00 / 27 = 0.89 cubic yards
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Calculated using verified formulas. Last updated March 2026.