How much concrete for a 40×50 slab 4 inches thick?
Answer
24.69 cubic yards
926 bags of 80lb concrete mix1482 bags of 60lb mixOrder ready-mix delivery (~$3,704)Add 10% for waste = 27.16 cy
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How We Calculated This
Cubic yards = (L × W × D/12) / 27
(50 × 40 × 4/12) / 27 = 666.67 / 27 = 24.69 cubic yards
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Calculated using verified formulas. Last updated March 2026.