Concrete for a 22×25 slab
6.79 cubic yards (337 × 80 lb bags)
for a 22×25 ft slab 4 inches thick: 183.3 cu ft. Bag counts include 10% extra; at 6 inches you need 10.19 yards.
A 22×25 foot slab covers 550 square feet. At the standard 4 inch thickness for a patio, walkway or shed floor, that is 183.3 cubic feet of concrete, or 6.79 cubic yards. At this size ready-mix is cheaper and far less work than bags: about 7.5 yards, roughly $1,238 before delivery fees, against $2,191 for 337 bags of 80 lb mix.
Concrete for a 22×25 slab by thickness
| Thickness | Cubic yards | Cubic feet | 80 lb bags | 60 lb bags | 40 lb bags |
|---|---|---|---|---|---|
| 3 in | 5.09 | 137.5 | 253 | 337 | 505 |
| 4 in | 6.79 | 183.3 | 337 | 449 | 673 |
| 5 in | 8.49 | 229.2 | 421 | 561 | 841 |
| 6 in | 10.19 | 275 | 505 | 673 | 1009 |
| 8 in | 13.58 | 366.7 | 673 | 897 | 1345 |
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: 25 × 22 × 0.333 = 183.33 cu ft.
- Divide by 27 for cubic yards: 183.33 ÷ 27 = 6.79 cu yd.
- Add 10% and divide by the bag yield: 201.67 ÷ 0.6 = 337 bags of 80 lb mix (rounded up).
Under the slab, plan on 4 inches of compacted gravel: about 6.79 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
- 22×24 slab
- 22×26 slab
- 20×25 slab
- 24×25 slab
- 22×22 slab
- 22×28 slab
- 25×25 slab
- 18×25 slab
- 25×26 slab
- 20×22 slab
- 22×30 slab
- 16×25 slab
Questions
- How many bags of concrete do I need for a 22×25 slab?
- At 4 inches thick, a 22×25 slab takes 337 bags of 80 lb concrete mix, 449 bags of 60 lb mix or 673 bags of 40 lb mix, including 10% extra.
- How many yards of concrete for a 22×25 slab?
- 6.79 cubic yards at 4 inches thick, 8.49 at 5 inches and 10.19 at 6 inches, before adding extra for waste.
- How much does a 22×25 concrete slab cost?
- The concrete alone for a 4 inch 22×25 slab costs about $2,191 in 337 bags of 80 lb mix (at about $7 a bag) or about $1,238 for 7.5 yards of ready-mix (at about $165 a yard, before delivery fees). Professionally poured slabs usually run $6 to $12 per square foot, about $3,300 to $6,600 for 550 sq ft.
- How much does a 22×25 slab weigh?
- About 13.3 tons at 4 inches thick (concrete weighs about 145 lb per cubic foot).