How much concrete for a 24×36 slab 8 inches thick?
Answer
21.33 cubic yards
800 bags of 80lb concrete mix1280 bags of 60lb mixOrder ready-mix delivery (~$3,199)Add 10% for waste = 23.46 cy
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How We Calculated This
Cubic yards = (L × W × D/12) / 27
(36 × 24 × 8/12) / 27 = 576.00 / 27 = 21.33 cubic yards
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Calculated using verified formulas. Last updated March 2026.