Concrete for a 14×22 slab
3.8 cubic yards (189 × 80 lb bags)
for a 14×22 ft slab 4 inches thick: 102.7 cu ft. Bag counts include 10% extra; at 6 inches you need 5.7 yards.
A 14×22 foot slab covers 308 square feet. At the standard 4 inch thickness for a patio, walkway or shed floor, that is 102.7 cubic feet of concrete, or 3.8 cubic yards. At this size ready-mix is cheaper and far less work than bags: about 4.25 yards, roughly $701 before delivery fees, against $1,229 for 189 bags of 80 lb mix.
Concrete for a 14×22 slab by thickness
| Thickness | Cubic yards | Cubic feet | 80 lb bags | 60 lb bags | 40 lb bags |
|---|---|---|---|---|---|
| 3 in | 2.85 | 77 | 142 | 189 | 283 |
| 4 in | 3.8 | 102.7 | 189 | 251 | 377 |
| 5 in | 4.75 | 128.3 | 236 | 314 | 471 |
| 6 in | 5.7 | 154 | 283 | 377 | 565 |
| 8 in | 7.6 | 205.3 | 377 | 502 | 753 |
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 × 14 × 0.333 = 102.67 cu ft.
- Divide by 27 for cubic yards: 102.67 ÷ 27 = 3.802 cu yd.
- Add 10% and divide by the bag yield: 112.93 ÷ 0.6 = 189 bags of 80 lb mix (rounded up).
Under the slab, plan on 4 inches of compacted gravel: about 3.8 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
- 14×20 slab
- 14×24 slab
- 14×25 slab
- 12×22 slab
- 16×22 slab
- 14×18 slab
- 14×26 slab
- 14×16 slab
- 14×28 slab
- 10×22 slab
- 18×22 slab
Questions
- How many bags of concrete do I need for a 14×22 slab?
- At 4 inches thick, a 14×22 slab takes 189 bags of 80 lb concrete mix, 251 bags of 60 lb mix or 377 bags of 40 lb mix, including 10% extra.
- How many yards of concrete for a 14×22 slab?
- 3.8 cubic yards at 4 inches thick, 4.75 at 5 inches and 5.7 at 6 inches, before adding extra for waste.
- How much does a 14×22 concrete slab cost?
- The concrete alone for a 4 inch 14×22 slab costs about $1,229 in 189 bags of 80 lb mix (at about $7 a bag) or about $701 for 4.25 yards of ready-mix (at about $165 a yard, before delivery fees). Professionally poured slabs usually run $6 to $12 per square foot, about $1,848 to $3,696 for 308 sq ft.
- How much does a 14×22 slab weigh?
- About 7.4 tons at 4 inches thick (concrete weighs about 145 lb per cubic foot).