How much concrete for a 14×20 slab 4 inches thick?
Answer
3.46 cubic yards
130 bags of 80lb concrete mix208 bags of 60lb mixOrder ready-mix delivery (~$519)Add 10% for waste = 3.81 cy
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How We Calculated This
Cubic yards = (L × W × D/12) / 27
(20 × 14 × 4/12) / 27 = 93.33 / 27 = 3.46 cubic yards
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Calculated using verified formulas. Last updated March 2026.