Concrete for a 14×14 slab
2.42 cubic yards (120 × 80 lb bags)
for a 14×14 ft slab 4 inches thick: 65.3 cu ft. Bag counts include 10% extra; at 6 inches you need 3.63 yards.
A 14×14 foot slab covers 196 square feet. At the standard 4 inch thickness for a patio, walkway or shed floor, that is 65.3 cubic feet of concrete, or 2.42 cubic yards. At this size you can mix 120 bags of 80 lb (about $780 and a long day of mixing) or order 2.75 yards of ready-mix (about $454, plus the short-load fee most suppliers charge under 3 to 4 yards).
Concrete for a 14×14 slab by thickness
| Thickness | Cubic yards | Cubic feet | 80 lb bags | 60 lb bags | 40 lb bags |
|---|---|---|---|---|---|
| 3 in | 1.81 | 49 | 90 | 120 | 180 |
| 4 in | 2.42 | 65.3 | 120 | 160 | 240 |
| 5 in | 3.02 | 81.7 | 150 | 200 | 300 |
| 6 in | 3.63 | 98 | 180 | 240 | 360 |
| 8 in | 4.84 | 130.7 | 240 | 320 | 480 |
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: 14 × 14 × 0.333 = 65.33 cu ft.
- Divide by 27 for cubic yards: 65.33 ÷ 27 = 2.42 cu yd.
- Add 10% and divide by the bag yield: 71.87 ÷ 0.6 = 120 bags of 80 lb mix (rounded up).
Under the slab, plan on 4 inches of compacted gravel: about 2.42 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
- 14×15 slab
- 12×14 slab
- 14×16 slab
- 10×14 slab
- 14×18 slab
- 8×14 slab
- 14×20 slab
- 6×14 slab
- 14×22 slab
- 5×14 slab
- 4×14 slab
- 14×24 slab
Questions
- How many bags of concrete do I need for a 14×14 slab?
- At 4 inches thick, a 14×14 slab takes 120 bags of 80 lb concrete mix, 160 bags of 60 lb mix or 240 bags of 40 lb mix, including 10% extra.
- How many yards of concrete for a 14×14 slab?
- 2.42 cubic yards at 4 inches thick, 3.02 at 5 inches and 3.63 at 6 inches, before adding extra for waste.
- How much does a 14×14 concrete slab cost?
- The concrete alone for a 4 inch 14×14 slab costs about $780 in 120 bags of 80 lb mix (at about $7 a bag) or about $454 for 2.75 yards of ready-mix (at about $165 a yard, before delivery fees). Professionally poured slabs usually run $6 to $12 per square foot, about $1,176 to $2,352 for 196 sq ft.
- How much does a 14×14 slab weigh?
- About 4.7 tons at 4 inches thick (concrete weighs about 145 lb per cubic foot).