How much concrete for a 16×40 slab 5 inches thick?
Answer
9.88 cubic yards
371 bags of 80lb concrete mix593 bags of 60lb mixOrder ready-mix delivery (~$1,482)Add 10% for waste = 10.87 cy
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How We Calculated This
Cubic yards = (L × W × D/12) / 27
(40 × 16 × 5/12) / 27 = 266.67 / 27 = 9.88 cubic yards
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Calculated using verified formulas. Last updated March 2026.