Concrete for a 16×26 slab
5.14 cubic yards (255 × 80 lb bags)
for a 16×26 ft slab 4 inches thick: 138.7 cu ft. Bag counts include 10% extra; at 6 inches you need 7.7 yards.
A 16×26 foot slab covers 416 square feet. At the standard 4 inch thickness for a patio, walkway or shed floor, that is 138.7 cubic feet of concrete, or 5.14 cubic yards. At this size ready-mix is cheaper and far less work than bags: about 5.75 yards, roughly $949 before delivery fees, against $1,658 for 255 bags of 80 lb mix.
Concrete for a 16×26 slab by thickness
| Thickness | Cubic yards | Cubic feet | 80 lb bags | 60 lb bags | 40 lb bags |
|---|---|---|---|---|---|
| 3 in | 3.85 | 104 | 191 | 255 | 382 |
| 4 in | 5.14 | 138.7 | 255 | 339 | 509 |
| 5 in | 6.42 | 173.3 | 318 | 424 | 636 |
| 6 in | 7.7 | 208 | 382 | 509 | 763 |
| 8 in | 10.27 | 277.3 | 509 | 678 | 1017 |
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 × 16 × 0.333 = 138.67 cu ft.
- Divide by 27 for cubic yards: 138.67 ÷ 27 = 5.136 cu yd.
- Add 10% and divide by the bag yield: 152.53 ÷ 0.6 = 255 bags of 80 lb mix (rounded up).
Under the slab, plan on 4 inches of compacted gravel: about 5.14 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
- 16×25 slab
- 15×26 slab
- 16×24 slab
- 16×28 slab
- 14×26 slab
- 18×26 slab
- 16×22 slab
- 16×30 slab
- 16×20 slab
- 16×32 slab
- 12×26 slab
- 20×26 slab
Questions
- How many bags of concrete do I need for a 16×26 slab?
- At 4 inches thick, a 16×26 slab takes 255 bags of 80 lb concrete mix, 339 bags of 60 lb mix or 509 bags of 40 lb mix, including 10% extra.
- How many yards of concrete for a 16×26 slab?
- 5.14 cubic yards at 4 inches thick, 6.42 at 5 inches and 7.7 at 6 inches, before adding extra for waste.
- How much does a 16×26 concrete slab cost?
- The concrete alone for a 4 inch 16×26 slab costs about $1,658 in 255 bags of 80 lb mix (at about $7 a bag) or about $949 for 5.75 yards of ready-mix (at about $165 a yard, before delivery fees). Professionally poured slabs usually run $6 to $12 per square foot, about $2,496 to $4,992 for 416 sq ft.
- How much does a 16×26 slab weigh?
- About 10.1 tons at 4 inches thick (concrete weighs about 145 lb per cubic foot).