How Much Concrete for a 14x14 Slab?
A 14×14 ft slab covers 196 sq ft. At the standard 4-inch thickness it needs 2.42 cubic yards of concrete – about 120 bags of 80 lb mix including 10% extra. Adjust the thickness below for your project.
Concrete for a 14x14 slab by thickness
| Thickness | Cubic yards | Yards +10% | 80 lb bags | 60 lb bags | Ready-mix cost* |
|---|---|---|---|---|---|
| 4 in | 2.42 | 2.66 | 120 | 160 | $439 |
| 5 in | 3.02 | 3.33 | 150 | 200 | $549 |
| 6 in | 3.63 | 3.99 | 180 | 240 | $659 |
*At about $165 per cubic yard before delivery and short-load fees. Bag counts include 10% extra.
How it is calculated
14 ft × 14 ft × (4 in ÷ 12) = 65.3 cu ft
65.3 cu ft ÷ 27 = 2.42 cubic yards
80 lb bags = 65.3 × 1.10 ÷ 0.60 = 120
Which thickness do you need?
- 4 inches – patios, walkways, shed floors and most residential garage floors.
- 5–6 inches – driveways, hot tub pads, and garages for heavier trucks or RVs.
- Add 4–6 inches of compacted gravel base underneath and use rebar or wire mesh for slabs larger than about 10×10 ft.
Frequently asked questions
How many yards of concrete for a 14x14 slab?
A 14x14 slab (196 sq ft) needs 2.42 cubic yards at 4 inches thick, 3.02 yd³ at 5 inches and 3.63 yd³ at 6 inches, before waste.
How many bags of concrete for a 14x14 slab?
At 4 inches thick with 10% extra, you need about 120 bags of 80 lb concrete mix or 160 bags of 60 lb mix.
Should I use bags or ready-mix for a 14x14 slab?
At 2.7 cubic yards, ready-mix delivery is usually faster and more consistent than mixing 120 bags by hand. Many suppliers charge a short-load fee under 3–4 yards.