Concrete for a 25×26 slab
8.02 cubic yards (398 × 80 lb bags)
for a 25×26 ft slab 4 inches thick: 216.7 cu ft. Bag counts include 10% extra; at 6 inches you need 12.04 yards.
A 25×26 foot slab covers 650 square feet. At the standard 4 inch thickness for a patio, walkway or shed floor, that is 216.7 cubic feet of concrete, or 8.02 cubic yards. At this size ready-mix is cheaper and far less work than bags: about 9 yards, roughly $1,485 before delivery fees, against $2,587 for 398 bags of 80 lb mix.
Concrete for a 25×26 slab by thickness
| Thickness | Cubic yards | Cubic feet | 80 lb bags | 60 lb bags | 40 lb bags |
|---|---|---|---|---|---|
| 3 in | 6.02 | 162.5 | 298 | 398 | 596 |
| 4 in | 8.02 | 216.7 | 398 | 530 | 795 |
| 5 in | 10.03 | 270.8 | 497 | 663 | 994 |
| 6 in | 12.04 | 325 | 596 | 795 | 1192 |
| 8 in | 16.05 | 433.3 | 795 | 1060 | 1589 |
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: 26 × 25 × 0.333 = 216.67 cu ft.
- Divide by 27 for cubic yards: 216.67 ÷ 27 = 8.025 cu yd.
- Add 10% and divide by the bag yield: 238.33 ÷ 0.6 = 398 bags of 80 lb mix (rounded up).
Under the slab, plan on 4 inches of compacted gravel: about 8.02 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
- 25×25 slab
- 24×26 slab
- 26×26 slab
- 24×25 slab
- 25×28 slab
- 22×26 slab
- 26×28 slab
- 22×25 slab
- 25×30 slab
- 20×26 slab
- 26×30 slab
- 20×25 slab
Questions
- How many bags of concrete do I need for a 25×26 slab?
- At 4 inches thick, a 25×26 slab takes 398 bags of 80 lb concrete mix, 530 bags of 60 lb mix or 795 bags of 40 lb mix, including 10% extra.
- How many yards of concrete for a 25×26 slab?
- 8.02 cubic yards at 4 inches thick, 10.03 at 5 inches and 12.04 at 6 inches, before adding extra for waste.
- How much does a 25×26 concrete slab cost?
- The concrete alone for a 4 inch 25×26 slab costs about $2,587 in 398 bags of 80 lb mix (at about $7 a bag) or about $1,485 for 9 yards of ready-mix (at about $165 a yard, before delivery fees). Professionally poured slabs usually run $6 to $12 per square foot, about $3,900 to $7,800 for 650 sq ft.
- How much does a 25×26 slab weigh?
- About 15.7 tons at 4 inches thick (concrete weighs about 145 lb per cubic foot).