How much concrete for a 50×50 slab 5 inches thick?
Answer
38.58 cubic yards
1447 bags of 80lb concrete mix2315 bags of 60lb mixOrder ready-mix delivery (~$5,787)Add 10% for waste = 42.44 cy
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How We Calculated This
Cubic yards = (L × W × D/12) / 27
(50 × 50 × 5/12) / 27 = 1041.67 / 27 = 38.58 cubic yards
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Calculated using verified formulas. Last updated March 2026.