How much concrete for a 14×15 slab 5 inches thick?
Answer
3.24 cubic yards
122 bags of 80lb concrete mix195 bags of 60lb mixOrder ready-mix delivery (~$486)Add 10% for waste = 3.56 cy
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How We Calculated This
Cubic yards = (L × W × D/12) / 27
(15 × 14 × 5/12) / 27 = 87.50 / 27 = 3.24 cubic yards
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Calculated using verified formulas. Last updated March 2026.