How much concrete for a 16×40 slab 8 inches thick?
Answer
15.80 cubic yards
593 bags of 80lb concrete mix949 bags of 60lb mixOrder ready-mix delivery (~$2,370)Add 10% for waste = 17.38 cy
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How We Calculated This
Cubic yards = (L × W × D/12) / 27
(40 × 16 × 8/12) / 27 = 426.67 / 27 = 15.80 cubic yards
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Calculated using verified formulas. Last updated March 2026.