Concrete for a 5×26 slab
1.6 cubic yards (80 × 80 lb bags)
for a 5×26 ft slab 4 inches thick: 43.3 cu ft. Bag counts include 10% extra; at 6 inches you need 2.41 yards.
A 5×26 foot slab covers 130 square feet. At the standard 4 inch thickness for a patio, walkway or shed floor, that is 43.3 cubic feet of concrete, or 1.6 cubic yards. At this size you can mix 80 bags of 80 lb (about $520 and a long day of mixing) or order 2 yards of ready-mix (about $330, plus the short-load fee most suppliers charge under 3 to 4 yards).
Concrete for a 5×26 slab by thickness
| Thickness | Cubic yards | Cubic feet | 80 lb bags | 60 lb bags | 40 lb bags |
|---|---|---|---|---|---|
| 3 in | 1.2 | 32.5 | 60 | 80 | 120 |
| 4 in | 1.6 | 43.3 | 80 | 106 | 159 |
| 5 in | 2.01 | 54.2 | 100 | 133 | 199 |
| 6 in | 2.41 | 65 | 120 | 159 | 239 |
| 8 in | 3.21 | 86.7 | 159 | 212 | 318 |
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 × 5 × 0.333 = 43.33 cu ft.
- Divide by 27 for cubic yards: 43.33 ÷ 27 = 1.605 cu yd.
- Add 10% and divide by the bag yield: 47.67 ÷ 0.6 = 80 bags of 80 lb mix (rounded up).
Under the slab, plan on 4 inches of compacted gravel: about 1.6 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
- 5×25 slab
- 5×24 slab
- 5×28 slab
- 5×22 slab
- 5×30 slab
- 4×26 slab
- 6×26 slab
- 5×20 slab
- 5×32 slab
- 5×18 slab
- 5×16 slab
- 5×36 slab
Questions
- How many bags of concrete do I need for a 5×26 slab?
- At 4 inches thick, a 5×26 slab takes 80 bags of 80 lb concrete mix, 106 bags of 60 lb mix or 159 bags of 40 lb mix, including 10% extra.
- How many yards of concrete for a 5×26 slab?
- 1.6 cubic yards at 4 inches thick, 2.01 at 5 inches and 2.41 at 6 inches, before adding extra for waste.
- How much does a 5×26 concrete slab cost?
- The concrete alone for a 4 inch 5×26 slab costs about $520 in 80 bags of 80 lb mix (at about $7 a bag) or about $330 for 2 yards of ready-mix (at about $165 a yard, before delivery fees). Professionally poured slabs usually run $6 to $12 per square foot, about $780 to $1,560 for 130 sq ft.
- How much does a 5×26 slab weigh?
- About 3.1 tons at 4 inches thick (concrete weighs about 145 lb per cubic foot).