Concrete for a 26×32 slab
10.27 cubic yards (509 × 80 lb bags)
for a 26×32 ft slab 4 inches thick: 277.3 cu ft. Bag counts include 10% extra; at 6 inches you need 15.41 yards.
A 26×32 foot slab covers 832 square feet. At the standard 4 inch thickness for a patio, walkway or shed floor, that is 277.3 cubic feet of concrete, or 10.27 cubic yards. At this size ready-mix is cheaper and far less work than bags: about 11.5 yards, roughly $1,898 before delivery fees, against $3,309 for 509 bags of 80 lb mix.
Concrete for a 26×32 slab by thickness
| Thickness | Cubic yards | Cubic feet | 80 lb bags | 60 lb bags | 40 lb bags |
|---|---|---|---|---|---|
| 3 in | 7.7 | 208 | 382 | 509 | 763 |
| 4 in | 10.27 | 277.3 | 509 | 678 | 1017 |
| 5 in | 12.84 | 346.7 | 636 | 848 | 1272 |
| 6 in | 15.41 | 416 | 763 | 1017 | 1526 |
| 8 in | 20.54 | 554.7 | 1017 | 1356 | 2034 |
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: 32 × 26 × 0.333 = 277.33 cu ft.
- Divide by 27 for cubic yards: 277.33 ÷ 27 = 10.272 cu yd.
- Add 10% and divide by the bag yield: 305.07 ÷ 0.6 = 509 bags of 80 lb mix (rounded up).
Under the slab, plan on 4 inches of compacted gravel: about 10.27 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
- 25×32 slab
- 26×30 slab
- 24×32 slab
- 28×32 slab
- 26×28 slab
- 26×36 slab
- 22×32 slab
- 30×32 slab
- 26×26 slab
- 25×26 slab
- 20×32 slab
- 32×32 slab
Questions
- How many bags of concrete do I need for a 26×32 slab?
- At 4 inches thick, a 26×32 slab takes 509 bags of 80 lb concrete mix, 678 bags of 60 lb mix or 1017 bags of 40 lb mix, including 10% extra.
- How many yards of concrete for a 26×32 slab?
- 10.27 cubic yards at 4 inches thick, 12.84 at 5 inches and 15.41 at 6 inches, before adding extra for waste.
- How much does a 26×32 concrete slab cost?
- The concrete alone for a 4 inch 26×32 slab costs about $3,309 in 509 bags of 80 lb mix (at about $7 a bag) or about $1,898 for 11.5 yards of ready-mix (at about $165 a yard, before delivery fees). Professionally poured slabs usually run $6 to $12 per square foot, about $4,992 to $9,984 for 832 sq ft.
- How much does a 26×32 slab weigh?
- About 20.1 tons at 4 inches thick (concrete weighs about 145 lb per cubic foot).