How much concrete for a 14×18 slab 5 inches thick?
Answer
3.89 cubic yards
146 bags of 80lb concrete mix234 bags of 60lb mixOrder ready-mix delivery (~$584)Add 10% for waste = 4.28 cy
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How We Calculated This
Cubic yards = (L × W × D/12) / 27
(18 × 14 × 5/12) / 27 = 105.00 / 27 = 3.89 cubic yards
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Calculated using verified formulas. Last updated March 2026.