How much concrete for a 25×40 slab 5 inches thick?
Answer
15.43 cubic yards
579 bags of 80lb concrete mix926 bags of 60lb mixOrder ready-mix delivery (~$2,315)Add 10% for waste = 16.97 cy
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How We Calculated This
Cubic yards = (L × W × D/12) / 27
(40 × 25 × 5/12) / 27 = 416.67 / 27 = 15.43 cubic yards
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Calculated using verified formulas. Last updated March 2026.