How much concrete for a 14×40 slab 8 inches thick?
Answer
13.83 cubic yards
519 bags of 80lb concrete mix830 bags of 60lb mixOrder ready-mix delivery (~$2,075)Add 10% for waste = 15.21 cy
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How We Calculated This
Cubic yards = (L × W × D/12) / 27
(40 × 14 × 8/12) / 27 = 373.33 / 27 = 13.83 cubic yards
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Calculated using verified formulas. Last updated March 2026.