How much concrete for a 4×50 slab 5 inches thick?
Answer
3.09 cubic yards
116 bags of 80lb concrete mix186 bags of 60lb mixOrder ready-mix delivery (~$464)Add 10% for waste = 3.40 cy
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How We Calculated This
Cubic yards = (L × W × D/12) / 27
(50 × 4 × 5/12) / 27 = 83.33 / 27 = 3.09 cubic yards
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Calculated using verified formulas. Last updated March 2026.