How much concrete for a 18×18 slab 4 inches thick?
Answer
4.00 cubic yards
150 bags of 80lb concrete mix240 bags of 60lb mixOrder ready-mix delivery (~$600)Add 10% for waste = 4.40 cy
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How We Calculated This
Cubic yards = (L × W × D/12) / 27
(18 × 18 × 4/12) / 27 = 108.00 / 27 = 4.00 cubic yards
Related Calculations
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Calculated using verified formulas. Last updated March 2026.