How much concrete for a 10×18 slab 6 inches thick?
Answer
3.33 cubic yards
125 bags of 80lb concrete mix200 bags of 60lb mixOrder ready-mix delivery (~$500)Add 10% for waste = 3.66 cy
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How We Calculated This
Cubic yards = (L × W × D/12) / 27
(18 × 10 × 6/12) / 27 = 90.00 / 27 = 3.33 cubic yards
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Calculated using verified formulas. Last updated March 2026.