Concrete for a 14×24 slab
4.15 cubic yards (206 × 80 lb bags)
for a 14×24 ft slab 4 inches thick: 112 cu ft. Bag counts include 10% extra; at 6 inches you need 6.22 yards.
A 14×24 foot slab covers 336 square feet. At the standard 4 inch thickness for a patio, walkway or shed floor, that is 112 cubic feet of concrete, or 4.15 cubic yards. At this size ready-mix is cheaper and far less work than bags: about 4.75 yards, roughly $784 before delivery fees, against $1,339 for 206 bags of 80 lb mix.
Concrete for a 14×24 slab by thickness
| Thickness | Cubic yards | Cubic feet | 80 lb bags | 60 lb bags | 40 lb bags |
|---|---|---|---|---|---|
| 3 in | 3.11 | 84 | 154 | 206 | 308 |
| 4 in | 4.15 | 112 | 206 | 274 | 411 |
| 5 in | 5.19 | 140 | 257 | 343 | 514 |
| 6 in | 6.22 | 168 | 308 | 411 | 616 |
| 8 in | 8.3 | 224 | 411 | 548 | 822 |
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: 24 × 14 × 0.333 = 112 cu ft.
- Divide by 27 for cubic yards: 112 ÷ 27 = 4.148 cu yd.
- Add 10% and divide by the bag yield: 123.2 ÷ 0.6 = 206 bags of 80 lb mix (rounded up).
Under the slab, plan on 4 inches of compacted gravel: about 4.15 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
- 14×25 slab
- 15×24 slab
- 14×22 slab
- 14×26 slab
- 12×24 slab
- 16×24 slab
- 14×20 slab
- 14×28 slab
- 14×18 slab
- 14×30 slab
- 10×24 slab
- 18×24 slab
Questions
- How many bags of concrete do I need for a 14×24 slab?
- At 4 inches thick, a 14×24 slab takes 206 bags of 80 lb concrete mix, 274 bags of 60 lb mix or 411 bags of 40 lb mix, including 10% extra.
- How many yards of concrete for a 14×24 slab?
- 4.15 cubic yards at 4 inches thick, 5.19 at 5 inches and 6.22 at 6 inches, before adding extra for waste.
- How much does a 14×24 concrete slab cost?
- The concrete alone for a 4 inch 14×24 slab costs about $1,339 in 206 bags of 80 lb mix (at about $7 a bag) or about $784 for 4.75 yards of ready-mix (at about $165 a yard, before delivery fees). Professionally poured slabs usually run $6 to $12 per square foot, about $2,016 to $4,032 for 336 sq ft.
- How much does a 14×24 slab weigh?
- About 8.1 tons at 4 inches thick (concrete weighs about 145 lb per cubic foot).