How Much Concrete for a 14x45 Slab?
For a 14x45 slab poured 4 inches thick, plan on about 7.78 cubic yards of concrete. That comes from 630 square feet times 0.333 feet of depth, divided by 27. How much concrete for a 14x45 slab at other thicknesses is in the table below.
Concrete calculator →The math for a 14x45 slab
- Area: 14 ft × 45 ft = 630 sq ft.
- Thickness in feet: 4 in ÷ 12 = 0.333 ft.
- Volume: 630 × 0.333 = 210.0 cubic feet.
- Cubic yards: 210.0 ÷ 27 = 7.78 yd³.
- With 10% extra: 8.56 yd³.
The concrete calculator runs the same steps for any size and thickness.
Related: How Much Gravel for a 14x45 Driveway?
Concrete for a 14x45 slab by thickness
| Thickness | Cubic feet | Cubic yards | Yards +10% | 80 lb bags | 60 lb bags |
|---|---|---|---|---|---|
| 4 in | 210.0 | 7.78 | 8.56 | 350 | 467 |
| 5 in | 262.5 | 9.72 | 10.69 | 438 | 584 |
| 6 in | 315.0 | 11.67 | 12.83 | 525 | 700 |
Bag counts assume about 0.60 cubic feet per 80 lb bag and 0.45 per 60 lb bag, rounded up.
Choosing the thickness
Four inches is the usual thickness for patios, walks and shed floors. Slabs that carry cars or a heavy hot tub are often poured at 5 to 6 inches, and edges are sometimes thickened where loads concentrate.
Related: How Many Tons of Asphalt for a 14x45 Driveway?
Truck or bags?
Ready-mix is priced and batched by the cubic yard (27 cubic feet). Plants commonly add a small-load fee when an order is under a set minimum, so ask about it when you call. Ordering a little extra costs far less than a second truck.
Getting the ground ready
Prep matters as much as the yardage. Strip sod and soft soil, compact the subgrade, then add a compacted stone base, commonly about 4 inches. A level, firm base also keeps your thickness even, which keeps the yardage close to the math.
Joints, mesh and rebar
Cut or tool control joints so the slab cracks where you want it to. A common rule is spacing them, in feet, at no more than two to three times the slab thickness in inches, so about 12 feet apart for a 4-inch slab, and about a quarter of the slab depth deep.
Questions people ask
How many yards of concrete for a 14x45 slab at 4 inches?
About 7.78 cubic yards, or 8.56 with 10 percent extra.
How many yards for a 14x45 slab at 6 inches?
About 11.67 cubic yards.
How many 80 lb bags for a 14x45 slab?
About 350 bags at 4 inches thick, before any waste allowance.
How many square feet is a 14x45 slab?
630 square feet.
How much does a cubic yard of concrete weigh?
Roughly 4,000 pounds, or about 2 tons, for normal-weight concrete.
When is bagged concrete practical?
Usually for jobs under about a cubic yard. Beyond that, mixing dozens of bags by hand gets slow and batches may not blend well.
Related guides
- How Much Area Does a Yard of Concrete Cover?
- How Many Bags of Concrete in a Yard? 40, 60, 80 lb
- Gravel Base Under a Concrete Slab: Depth and Tons
- How Many Yards in a Concrete Truck? Mixer Sizes
- Concrete Short Load Fee: What It Is and How to Cut It
- 60 lb vs 80 lb Concrete Bags: Yield, Count, and Cost
- Rebar vs Wire Mesh in a Slab: Which One to Use
- Cost to Pour a Concrete Slab: Per Square Foot
- How Much Concrete for a 14x36 Slab?
- How Much Concrete for a 14x40 Slab?
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