10×16 slab: concrete by thickness
| Thickness | Cu ft | Cu yd | 80 lb bags | 60 lb bags |
|---|---|---|---|---|
| 3.5″ | 46.67 | 1.73 | 78 | 104 |
| 4″ | 53.33 | 1.98 | 89 | 119 |
| 5″ | 66.67 | 2.47 | 112 | 149 |
| 6″ | 80.00 | 2.96 | 134 | 178 |
No waste included in the table.
Worked example
10 ft × 16 ft = 160 sq ft. At 4 inches: 160 × 4 ÷ 12 = 53.33 cu ft, or 1.98 cubic yards. With 10% extra that is 2.17 yd³, or 98 bags of 80 lb mix.
At over 1 cubic yard, compare the cost and labor of bags against a ready-mix delivery.
Assumes standard concrete mix bag yields: 80 lb ≈ 0.60 cu ft, 60 lb ≈ 0.45 cu ft. Check the yield on your bag. 1 cubic yard = 27 cubic feet.
Frequently asked questions
How many bags of concrete for a 10×16 slab?
89 × 80 lb or 119 × 60 lb bags at 4 inches thick, before waste.
How many yards of concrete for a 10×16 slab?
1.98 cubic yards at 4 inches; 2.96 at 6 inches.