How much concrete for a 24×30 slab 8 inches thick?
Answer
17.78 cubic yards
667 bags of 80lb concrete mix1067 bags of 60lb mixOrder ready-mix delivery (~$2,667)Add 10% for waste = 19.56 cy
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How We Calculated This
Cubic yards = (L × W × D/12) / 27
(30 × 24 × 8/12) / 27 = 480.00 / 27 = 17.78 cubic yards
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Calculated using verified formulas. Last updated March 2026.