Concrete for a 6×22 slab
1.63 cubic yards (81 × 80 lb bags)
for a 6×22 ft slab 4 inches thick: 44 cu ft. Bag counts include 10% extra; at 6 inches you need 2.44 yards.
A 6×22 foot slab covers 132 square feet. At the standard 4 inch thickness for a patio, walkway or shed floor, that is 44 cubic feet of concrete, or 1.63 cubic yards. At this size you can mix 81 bags of 80 lb (about $527 and a long day of mixing) or order 2 yards of ready-mix (about $330, plus the short-load fee most suppliers charge under 3 to 4 yards).
Concrete for a 6×22 slab by thickness
| Thickness | Cubic yards | Cubic feet | 80 lb bags | 60 lb bags | 40 lb bags |
|---|---|---|---|---|---|
| 3 in | 1.22 | 33 | 61 | 81 | 121 |
| 4 in | 1.63 | 44 | 81 | 108 | 162 |
| 5 in | 2.04 | 55 | 101 | 135 | 202 |
| 6 in | 2.44 | 66 | 121 | 162 | 242 |
| 8 in | 3.26 | 88 | 162 | 216 | 323 |
Bag counts include 10% extra for spillage and uneven ground. Cubic yards and cubic feet are the exact volume.
How it’s worked out
- Convert the thickness to feet: 4 in ÷ 12 = 0.333 ft.
- Multiply length × width × thickness: 22 × 6 × 0.333 = 44 cu ft.
- Divide by 27 for cubic yards: 44 ÷ 27 = 1.63 cu yd.
- Add 10% and divide by the bag yield: 48.4 ÷ 0.6 = 81 bags of 80 lb mix (rounded up).
Under the slab, plan on 4 inches of compacted gravel: about 1.63 cubic yards. For driveways and anything that carries a vehicle, go to 5 or 6 inches and add rebar or wire mesh.
Change the numbers
Other slab sizes
- 6×20 slab
- 6×24 slab
- 6×25 slab
- 5×22 slab
- 6×18 slab
- 6×26 slab
- 6×16 slab
- 6×28 slab
- 6×15 slab
- 4×22 slab
- 8×22 slab
- 6×14 slab
Questions
- How many bags of concrete do I need for a 6×22 slab?
- At 4 inches thick, a 6×22 slab takes 81 bags of 80 lb concrete mix, 108 bags of 60 lb mix or 162 bags of 40 lb mix, including 10% extra.
- How many yards of concrete for a 6×22 slab?
- 1.63 cubic yards at 4 inches thick, 2.04 at 5 inches and 2.44 at 6 inches, before adding extra for waste.
- How much does a 6×22 concrete slab cost?
- The concrete alone for a 4 inch 6×22 slab costs about $527 in 81 bags of 80 lb mix (at about $7 a bag) or about $330 for 2 yards of ready-mix (at about $165 a yard, before delivery fees). Professionally poured slabs usually run $6 to $12 per square foot, about $792 to $1,584 for 132 sq ft.
- How much does a 6×22 slab weigh?
- About 3.2 tons at 4 inches thick (concrete weighs about 145 lb per cubic foot).