How much concrete for a 10×20 slab 6 inches thick?
Answer
3.70 cubic yards
139 bags of 80lb concrete mix223 bags of 60lb mixOrder ready-mix delivery (~$555)Add 10% for waste = 4.07 cy
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How We Calculated This
Cubic yards = (L × W × D/12) / 27
(20 × 10 × 6/12) / 27 = 100.00 / 27 = 3.70 cubic yards
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Calculated using verified formulas. Last updated March 2026.