How much concrete for a 12×16 slab 8 inches thick?
Answer
4.74 cubic yards
178 bags of 80lb concrete mix285 bags of 60lb mixOrder ready-mix delivery (~$711)Add 10% for waste = 5.21 cy
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How We Calculated This
Cubic yards = (L × W × D/12) / 27
(16 × 12 × 8/12) / 27 = 128.00 / 27 = 4.74 cubic yards
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Calculated using verified formulas. Last updated March 2026.