Concrete for a 16×22 slab
4.35 cubic yards (216 × 80 lb bags)
for a 16×22 ft slab 4 inches thick: 117.3 cu ft. Bag counts include 10% extra; at 6 inches you need 6.52 yards.
A 16×22 foot slab covers 352 square feet. At the standard 4 inch thickness for a patio, walkway or shed floor, that is 117.3 cubic feet of concrete, or 4.35 cubic yards. At this size ready-mix is cheaper and far less work than bags: about 5 yards, roughly $825 before delivery fees, against $1,404 for 216 bags of 80 lb mix.
Concrete for a 16×22 slab by thickness
| Thickness | Cubic yards | Cubic feet | 80 lb bags | 60 lb bags | 40 lb bags |
|---|---|---|---|---|---|
| 3 in | 3.26 | 88 | 162 | 216 | 323 |
| 4 in | 4.35 | 117.3 | 216 | 287 | 431 |
| 5 in | 5.43 | 146.7 | 269 | 359 | 538 |
| 6 in | 6.52 | 176 | 323 | 431 | 646 |
| 8 in | 8.69 | 234.7 | 431 | 574 | 861 |
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 × 16 × 0.333 = 117.33 cu ft.
- Divide by 27 for cubic yards: 117.33 ÷ 27 = 4.346 cu yd.
- Add 10% and divide by the bag yield: 129.07 ÷ 0.6 = 216 bags of 80 lb mix (rounded up).
Under the slab, plan on 4 inches of compacted gravel: about 4.35 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
- 15×22 slab
- 16×20 slab
- 16×24 slab
- 14×22 slab
- 18×22 slab
- 16×25 slab
- 16×18 slab
- 16×26 slab
- 12×22 slab
- 20×22 slab
- 16×16 slab
- 16×28 slab
Questions
- How many bags of concrete do I need for a 16×22 slab?
- At 4 inches thick, a 16×22 slab takes 216 bags of 80 lb concrete mix, 287 bags of 60 lb mix or 431 bags of 40 lb mix, including 10% extra.
- How many yards of concrete for a 16×22 slab?
- 4.35 cubic yards at 4 inches thick, 5.43 at 5 inches and 6.52 at 6 inches, before adding extra for waste.
- How much does a 16×22 concrete slab cost?
- The concrete alone for a 4 inch 16×22 slab costs about $1,404 in 216 bags of 80 lb mix (at about $7 a bag) or about $825 for 5 yards of ready-mix (at about $165 a yard, before delivery fees). Professionally poured slabs usually run $6 to $12 per square foot, about $2,112 to $4,224 for 352 sq ft.
- How much does a 16×22 slab weigh?
- About 8.5 tons at 4 inches thick (concrete weighs about 145 lb per cubic foot).