How much concrete for a 6×30 slab 4 inches thick?
Answer
2.22 cubic yards
84 bags of 80lb concrete mix134 bags of 60lb mix~$333 for ready-mix
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How We Calculated This
Cubic yards = (L × W × D/12) / 27
(30 × 6 × 4/12) / 27 = 60.00 / 27 = 2.22 cubic yards
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Calculated using verified formulas. Last updated March 2026.