How Much Concrete for a 10x10 Slab?
A quick guide to concrete quantities for a common 10x10 slab.
Last reviewed: June 2026
Short Answer
A 10x10 slab that is 4 inches thick needs about 33.3 cubic feet, or 1.23 cubic yards, before waste. With a 10% waste factor, plan for about 1.36 cubic yards.
Calculate your slab concretePractical Explanation
A 10x10 slab is 100 square feet. The amount of concrete depends on thickness. Patios and walkways are often 4 inches thick, while driveways or heavier loads may need more depth and reinforcement.
For a homeowner, this helps with store or delivery planning. For a contractor or small crew, it is a fast check before quoting, but final quantities should match site conditions and project specs.
Simple Formula
Cubic feet = 10 x 10 x thickness in feet. Cubic yards = cubic feet / 27.
Example: 10x10 slab at 4 inches thick
- Convert thickness: 4 / 12 = 0.333 ft
- Calculate volume: 10 x 10 x 0.333 = 33.3 cubic feet
- Convert to yards: 33.3 / 27 = 1.23 cubic yards
- Add 10% waste: 1.23 x 1.10 = 1.36 cubic yards
A practical estimate is about 1.36 cubic yards for a 10x10x4 slab with waste included.
Common Mistakes
- Assuming all 10x10 slabs use the same amount of concrete regardless of thickness.
- Forgetting that bag yield varies by manufacturer.
- Ignoring gravel base, compaction, reinforcement, or slope requirements.
FAQ
How many cubic yards are in a 10x10 slab?
At 4 inches thick, a 10x10 slab is about 1.23 cubic yards before waste and about 1.36 cubic yards with 10% waste.
How thick should a 10x10 slab be?
Many patios and walkways use 4 inches, but driveways, heavy loads, and structural uses may require more thickness and reinforcement.
Estimate Disclaimer
These guides and calculators provide planning estimates. Bag yields, material density, compaction, waste, site conditions, supplier measurements, and local requirements can vary. Confirm quantities with your supplier, contractor, plans, or local code requirements when needed.
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