How much concrete for a 25×50 slab 8 inches thick?
Answer
30.86 cubic yards
1158 bags of 80lb concrete mix1852 bags of 60lb mixOrder ready-mix delivery (~$4,629)Add 10% for waste = 33.95 cy
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How We Calculated This
Cubic yards = (L × W × D/12) / 27
(50 × 25 × 8/12) / 27 = 833.33 / 27 = 30.86 cubic yards
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Calculated using verified formulas. Last updated March 2026.