How Much Concrete for a 24x26 Garage Slab?
How much concrete for a 24x26 garage slab depends on thickness. The garage slab covers 24 × 26 = 624 square feet, and at 5 inches thick that is about 9.63 cubic yards, or 10.59 yards with a 10 percent allowance. Mixed from bags, it is roughly 434 bags of 80 lb mix.
Concrete calculator →The math for a 24x26 garage slab
- Area: 24 ft × 26 ft = 624 sq ft.
- Thickness in feet: 5 in ÷ 12 = 0.417 ft.
- Volume: 624 × 0.417 = 260.0 cubic feet.
- Cubic yards: 260.0 ÷ 27 = 9.63 yd³.
- With 10% extra: 10.59 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 24x26 garage slab by thickness
| Thickness | Cubic feet | Cubic yards | Yards +10% | 80 lb bags | 60 lb bags |
|---|---|---|---|---|---|
| 4 in | 208.0 | 7.70 | 8.47 | 347 | 463 |
| 5 in | 260.0 | 9.63 | 10.59 | 434 | 578 |
| 6 in | 312.0 | 11.56 | 12.71 | 520 | 694 |
Bag counts assume about 0.60 cubic feet per 80 lb bag and 0.45 per 60 lb bag, rounded up.
How thick to pour it
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?
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
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 24x26 garage slab at 4 inches?
About 7.70 cubic yards, or 8.47 with 10 percent extra.
How many yards for a 24x26 garage slab at 6 inches?
About 11.56 cubic yards.
How many 80 lb bags for a 24x26 garage slab?
About 347 bags at 4 inches thick, before any waste allowance.
How many square feet is a 24x26 garage slab?
624 square feet.
How much does a cubic yard of concrete weigh?
Roughly 4,000 pounds, or about 2 tons, for normal-weight concrete.
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 22x22 Garage Slab?
- How Much Concrete for a 22x24 Garage Slab?
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