How Much Concrete for a 10 Foot Round Slab?
A round pad 10 feet in diameter covers about 78.5 square feet. How much concrete for a 10 foot round slab at 4 inches: 0.97 cubic yards, or about 44 bags of 80 lb mix.
Concrete calculator →The circle math
- Radius: 10 ÷ 2 = 5 ft.
- Area: 3.1416 × 5 × 5 = 78.5 sq ft.
- Volume at 4 in: 78.5 × 0.333 = 26.2 cu ft.
- Yards: ÷ 27 = 0.97 yd³.
A round slab takes about 21 percent less concrete than a square of the same width (10x10 would need 1.23 yards at 4 inches).
Related: How Much Concrete for a 24 Foot Round Slab?
By thickness
| Thickness | Cubic feet | Cubic yards | Yards +10% | 80 lb bags | 60 lb bags |
|---|---|---|---|---|---|
| 4 in | 26.2 | 0.97 | 1.07 | 44 | 59 |
| 5 in | 32.7 | 1.21 | 1.33 | 55 | 73 |
| 6 in | 39.3 | 1.45 | 1.60 | 66 | 88 |
Forming a circle
Curved forms are usually made from thin hardboard, bender board or kerfed plywood bent around stakes. Drive a center pin and use a string or a board pivot to mark the radius, then set stakes every foot or so around the curve.
Related: How Much Concrete for a 24 Foot Round Slab?
Common uses and thickness
Fire pit patios, gazebo floors and tank pads are the usual round slabs. For people and furniture, 4 inches on compacted gravel is standard. Anything heavy needs more thickness and possibly reinforcement; check the manufacturer’s requirements for tanks or bins.
Joints in a round slab
Cut control joints like pie slices from the center outward, with an optional ring joint for larger circles, so each panel stays a manageable size.
Questions people ask
How many yards of concrete for a 10 ft round slab?
About 0.97 cubic yards at 4 inches.
How many square feet is a 10 ft circle?
About 78.5 square feet.
How many 80 lb bags for a 10 ft round slab?
About 44 bags at 4 inches thick.
How do I find the area of a circle?
Multiply 3.1416 by the radius squared. The radius is half the diameter.
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
- Gravel for a Fire Pit Area: Best Types and Depth
- How Much Concrete for a 6 Foot Round Slab?
- How Much Concrete for an 8 Foot Round Slab?
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