How much concrete for a 16×30 slab 8 inches thick?
Answer
11.85 cubic yards
445 bags of 80lb concrete mix712 bags of 60lb mixOrder ready-mix delivery (~$1,778)Add 10% for waste = 13.04 cy
Need a custom calculation?
Open the full calculator with custom inputs
How We Calculated This
Cubic yards = (L × W × D/12) / 27
(30 × 16 × 8/12) / 27 = 320.00 / 27 = 11.85 cubic yards
Related Calculations
How much concrete for a 4×4 slab 4 inches thick?0.20 cubic yardsHow much concrete for a 4×4 slab 6 inches thick?0.30 cubic yardsHow much concrete for a 4×4 slab 8 inches thick?0.40 cubic yardsHow much concrete for a 4×6 slab 4 inches thick?0.30 cubic yardsHow much concrete for a 4×6 slab 6 inches thick?0.44 cubic yards
Calculated using verified formulas. Last updated March 2026.