How much concrete for a 14×40 slab 5 inches thick?
Answer
8.64 cubic yards
324 bags of 80lb concrete mix519 bags of 60lb mixOrder ready-mix delivery (~$1,296)Add 10% for waste = 9.50 cy
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How We Calculated This
Cubic yards = (L × W × D/12) / 27
(40 × 14 × 5/12) / 27 = 233.33 / 27 = 8.64 cubic yards
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Calculated using verified formulas. Last updated March 2026.