How much concrete for a 40×50 slab 6 inches thick?
Answer
37.04 cubic yards
1389 bags of 80lb concrete mix2223 bags of 60lb mixOrder ready-mix delivery (~$5,556)Add 10% for waste = 40.74 cy
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How We Calculated This
Cubic yards = (L × W × D/12) / 27
(50 × 40 × 6/12) / 27 = 1000.00 / 27 = 37.04 cubic yards
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Calculated using verified formulas. Last updated March 2026.