How much concrete for a 30×36 slab 8 inches thick?
Answer
26.67 cubic yards
1001 bags of 80lb concrete mix1600 bags of 60lb mixOrder ready-mix delivery (~$4,001)Add 10% for waste = 29.34 cy
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How We Calculated This
Cubic yards = (L × W × D/12) / 27
(36 × 30 × 8/12) / 27 = 720.00 / 27 = 26.67 cubic yards
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Calculated using verified formulas. Last updated March 2026.