How much concrete for a 14×30 slab 6 inches thick?
Answer
7.78 cubic yards
292 bags of 80lb concrete mix467 bags of 60lb mixOrder ready-mix delivery (~$1,167)Add 10% for waste = 8.56 cy
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How We Calculated This
Cubic yards = (L × W × D/12) / 27
(30 × 14 × 6/12) / 27 = 210.00 / 27 = 7.78 cubic yards
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Calculated using verified formulas. Last updated March 2026.