How Much Concrete for a 26x28 Garage Slab?
A 26 by 28 foot garage slab is 728 square feet. How much concrete for a 26x28 garage slab at the common 5-inch thickness: about 11.23 cubic yards. Most people order 12.50 yards to cover waste and an uneven base.
Concrete calculator →The math for a 26x28 garage slab
- Area: 26 ft × 28 ft = 728 sq ft.
- Thickness in feet: 5 in ÷ 12 = 0.417 ft.
- Volume: 728 × 0.417 = 303.3 cubic feet.
- Cubic yards: 303.3 ÷ 27 = 11.23 yd³.
- With 10% extra: 12.36 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 26x28 garage slab by thickness
| Thickness | Cubic feet | Cubic yards | Yards +10% | 80 lb bags | 60 lb bags |
|---|---|---|---|---|---|
| 4 in | 242.7 | 8.99 | 9.89 | 405 | 540 |
| 5 in | 303.3 | 11.23 | 12.36 | 506 | 675 |
| 6 in | 364.0 | 13.48 | 14.83 | 607 | 809 |
Bag counts assume about 0.60 cubic feet per 80 lb bag and 0.45 per 60 lb bag, rounded up.
Choosing the thickness
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?
Truck or bags?
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.
Getting the ground ready
Uneven ground is the main reason pours run short. Every half inch of extra depth across the garage slab adds concrete you did not plan for. Screed the base flat, check it with a string line and set the forms to finished height before the truck arrives.
Joints, mesh and rebar
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 8 feet apart control where cracks form.
Questions people ask
How many yards of concrete for a 26x28 garage slab at 4 inches?
About 8.99 cubic yards, or 9.89 with 10 percent extra.
How many yards for a 26x28 garage slab at 6 inches?
About 13.48 cubic yards.
How many 80 lb bags for a 26x28 garage slab?
About 405 bags at 4 inches thick, before any waste allowance.
How many square feet is a 26x28 garage slab?
728 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 24x36 Garage Slab?
- How Much Concrete for a 26x26 Garage Slab?
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