How much concrete for a 25×25 slab 5 inches thick?
Answer
9.65 cubic yards
362 bags of 80lb concrete mix579 bags of 60lb mixOrder ready-mix delivery (~$1,448)Add 10% for waste = 10.62 cy
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How We Calculated This
Cubic yards = (L × W × D/12) / 27
(25 × 25 × 5/12) / 27 = 260.42 / 27 = 9.65 cubic yards
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Calculated using verified formulas. Last updated March 2026.