How much concrete for a 30×50 slab 6 inches thick?
Answer
27.78 cubic yards
1042 bags of 80lb concrete mix1667 bags of 60lb mixOrder ready-mix delivery (~$4,167)Add 10% for waste = 30.56 cy
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How We Calculated This
Cubic yards = (L × W × D/12) / 27
(50 × 30 × 6/12) / 27 = 750.00 / 27 = 27.78 cubic yards
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Calculated using verified formulas. Last updated March 2026.