Concrete for a 22×50 slab
13.58 cubic yards (673 × 80 lb bags)
for a 22×50 ft slab 4 inches thick: 366.7 cu ft. Bag counts include 10% extra; at 6 inches you need 20.37 yards.
A 22×50 foot slab covers 1100 square feet. At the standard 4 inch thickness for a patio, walkway or shed floor, that is 366.7 cubic feet of concrete, or 13.58 cubic yards. At this size ready-mix is cheaper and far less work than bags: about 15 yards, roughly $2,475 before delivery fees, against $4,375 for 673 bags of 80 lb mix.
Concrete for a 22×50 slab by thickness
| Thickness | Cubic yards | Cubic feet | 80 lb bags | 60 lb bags | 40 lb bags |
|---|---|---|---|---|---|
| 3 in | 10.19 | 275 | 505 | 673 | 1009 |
| 4 in | 13.58 | 366.7 | 673 | 897 | 1345 |
| 5 in | 16.98 | 458.3 | 841 | 1121 | 1681 |
| 6 in | 20.37 | 550 | 1009 | 1345 | 2017 |
| 8 in | 27.16 | 733.3 | 1345 | 1793 | 2689 |
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: 50 × 22 × 0.333 = 366.67 cu ft.
- Divide by 27 for cubic yards: 366.67 ÷ 27 = 13.58 cu yd.
- Add 10% and divide by the bag yield: 403.33 ÷ 0.6 = 673 bags of 80 lb mix (rounded up).
Under the slab, plan on 4 inches of compacted gravel: about 13.58 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
- 20×50 slab
- 24×50 slab
- 25×50 slab
- 18×50 slab
- 26×50 slab
- 22×40 slab
- 16×50 slab
- 28×50 slab
- 22×36 slab
- 15×50 slab
- 22×32 slab
- 14×50 slab
Questions
- How many bags of concrete do I need for a 22×50 slab?
- At 4 inches thick, a 22×50 slab takes 673 bags of 80 lb concrete mix, 897 bags of 60 lb mix or 1345 bags of 40 lb mix, including 10% extra.
- How many yards of concrete for a 22×50 slab?
- 13.58 cubic yards at 4 inches thick, 16.98 at 5 inches and 20.37 at 6 inches, before adding extra for waste.
- How much does a 22×50 concrete slab cost?
- The concrete alone for a 4 inch 22×50 slab costs about $4,375 in 673 bags of 80 lb mix (at about $7 a bag) or about $2,475 for 15 yards of ready-mix (at about $165 a yard, before delivery fees). Professionally poured slabs usually run $6 to $12 per square foot, about $6,600 to $13,200 for 1100 sq ft.
- How much does a 22×50 slab weigh?
- About 26.6 tons at 4 inches thick (concrete weighs about 145 lb per cubic foot).