How Much Concrete for a 22x22 Garage Slab?
A 22 by 22 foot garage slab is 484 square feet. How much concrete for a 22x22 garage slab at the common 5-inch thickness: about 7.47 cubic yards. Most people order 8.25 yards to cover waste and an uneven base.
Concrete calculator →The math for a 22x22 garage slab
- Area: 22 ft × 22 ft = 484 sq ft.
- Thickness in feet: 5 in ÷ 12 = 0.417 ft.
- Volume: 484 × 0.417 = 201.7 cubic feet.
- Cubic yards: 201.7 ÷ 27 = 7.47 yd³.
- With 10% extra: 8.22 yd³.
The concrete calculator runs the same steps for any size and thickness.
Related: How Much Concrete for a 12x20 Garage Slab?
Concrete for a 22x22 garage slab by thickness
| Thickness | Cubic feet | Cubic yards | Yards +10% | 80 lb bags | 60 lb bags |
|---|---|---|---|---|---|
| 4 in | 161.3 | 5.98 | 6.57 | 269 | 359 |
| 5 in | 201.7 | 7.47 | 8.22 | 337 | 449 |
| 6 in | 242.0 | 8.96 | 9.86 | 404 | 538 |
Bag counts assume about 0.60 cubic feet per 80 lb bag and 0.45 per 60 lb bag, rounded up.
Thickness for this job
Garage floors are commonly 4 to 6 inches thick; 5 inches is a practical middle for cars and light trucks, and 6 inches suits heavier vehicles or a shop with equipment. Check local code, since some areas set a minimum.
Related: How Much Concrete for a 12x24 Garage Slab?
Ordering ready-mix
Concrete is ordered by the cubic yard, and a yard is 27 cubic feet. Ready-mix plants usually sell in quarter- or half-yard steps, so round up to the next step rather than down. Running short in the middle of a pour leaves a cold joint, which is a weak seam in the garage slab.
Prep before the pour
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.
Keeping cracks under control
Reinforcement does not stop cracks, but it holds them tight. Wire mesh or rebar set mid-depth on chairs is common for a garage slab that carries vehicles; fiber-reinforced mix is an option for light-duty slabs. Joints about 12 feet apart control where cracks form.
Questions people ask
How many yards of concrete for a 22x22 garage slab at 4 inches?
About 5.98 cubic yards, or 6.57 with 10 percent extra.
How many yards for a 22x22 garage slab at 6 inches?
About 8.96 cubic yards.
How many 80 lb bags for a 22x22 garage slab?
About 269 bags at 4 inches thick, before any waste allowance.
How many square feet is a 22x22 garage slab?
484 square feet.
Should I add extra for waste?
Yes. Adding 5 to 10 percent covers uneven base, spillage and form bulges.
How thick should the base under the slab be?
About 4 inches of compacted gravel is common for residential slabs, more on soft or poorly drained soil.
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 20x22 Garage Slab?
- How Much Concrete for a 20x24 Garage Slab?
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