How much concrete for a 4×8 slab 6 inches thick?
Answer
0.59 cubic yards
23 bags of 80lb concrete mix36 bags of 60lb mix~$89 for ready-mix
Need a custom calculation?
Open the full calculator with custom inputs
How We Calculated This
Cubic yards = (L × W × D/12) / 27
(8 × 4 × 6/12) / 27 = 16.00 / 27 = 0.59 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.