Concrete for a 14×25 slab
4.32 cubic yards (214 × 80 lb bags)
for a 14×25 ft slab 4 inches thick: 116.7 cu ft. Bag counts include 10% extra; at 6 inches you need 6.48 yards.
A 14×25 foot slab covers 350 square feet. At the standard 4 inch thickness for a patio, walkway or shed floor, that is 116.7 cubic feet of concrete, or 4.32 cubic yards. At this size ready-mix is cheaper and far less work than bags: about 5 yards, roughly $825 before delivery fees, against $1,391 for 214 bags of 80 lb mix.
Concrete for a 14×25 slab by thickness
| Thickness | Cubic yards | Cubic feet | 80 lb bags | 60 lb bags | 40 lb bags |
|---|---|---|---|---|---|
| 3 in | 3.24 | 87.5 | 161 | 214 | 321 |
| 4 in | 4.32 | 116.7 | 214 | 286 | 428 |
| 5 in | 5.4 | 145.8 | 268 | 357 | 535 |
| 6 in | 6.48 | 175 | 321 | 428 | 642 |
| 8 in | 8.64 | 233.3 | 428 | 571 | 856 |
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: 25 × 14 × 0.333 = 116.67 cu ft.
- Divide by 27 for cubic yards: 116.67 ÷ 27 = 4.321 cu yd.
- Add 10% and divide by the bag yield: 128.33 ÷ 0.6 = 214 bags of 80 lb mix (rounded up).
Under the slab, plan on 4 inches of compacted gravel: about 4.32 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
- 14×24 slab
- 14×26 slab
- 15×25 slab
- 14×22 slab
- 14×28 slab
- 12×25 slab
- 16×25 slab
- 14×20 slab
- 14×30 slab
- 14×18 slab
- 14×32 slab
- 10×25 slab
Questions
- How many bags of concrete do I need for a 14×25 slab?
- At 4 inches thick, a 14×25 slab takes 214 bags of 80 lb concrete mix, 286 bags of 60 lb mix or 428 bags of 40 lb mix, including 10% extra.
- How many yards of concrete for a 14×25 slab?
- 4.32 cubic yards at 4 inches thick, 5.4 at 5 inches and 6.48 at 6 inches, before adding extra for waste.
- How much does a 14×25 concrete slab cost?
- The concrete alone for a 4 inch 14×25 slab costs about $1,391 in 214 bags of 80 lb mix (at about $7 a bag) or about $825 for 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 $2,100 to $4,200 for 350 sq ft.
- How much does a 14×25 slab weigh?
- About 8.5 tons at 4 inches thick (concrete weighs about 145 lb per cubic foot).