How much concrete for a 8×50 slab 5 inches thick?
Answer
6.17 cubic yards
232 bags of 80lb concrete mix371 bags of 60lb mixOrder ready-mix delivery (~$926)Add 10% for waste = 6.79 cy
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How We Calculated This
Cubic yards = (L × W × D/12) / 27
(50 × 8 × 5/12) / 27 = 166.67 / 27 = 6.17 cubic yards
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Calculated using verified formulas. Last updated March 2026.