How much concrete for a 25×30 slab 8 inches thick?
Answer
18.52 cubic yards
695 bags of 80lb concrete mix1112 bags of 60lb mixOrder ready-mix delivery (~$2,778)Add 10% for waste = 20.37 cy
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How We Calculated This
Cubic yards = (L × W × D/12) / 27
(30 × 25 × 8/12) / 27 = 500.00 / 27 = 18.52 cubic yards
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Calculated using verified formulas. Last updated March 2026.