How Much Concrete for a 14 Foot Round Slab?
A round pad 14 feet in diameter covers about 153.9 square feet. How much concrete for a 14 foot round slab at 4 inches: 1.90 cubic yards, or about 86 bags of 80 lb mix.
Concrete calculator →The circle math
- Radius: 14 ÷ 2 = 7 ft.
- Area: 3.1416 × 7 × 7 = 153.9 sq ft.
- Volume at 4 in: 153.9 × 0.333 = 51.3 cu ft.
- Yards: ÷ 27 = 1.90 yd³.
A round slab takes about 21 percent less concrete than a square of the same width (14x14 would need 2.42 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 | 51.3 | 1.90 | 2.09 | 86 | 115 |
| 5 in | 64.1 | 2.38 | 2.61 | 107 | 143 |
| 6 in | 77.0 | 2.85 | 3.14 | 129 | 172 |
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
Round pads are popular for fire pit seating areas, grill stations, gazebos and tank bases. Four inches suits foot traffic and furniture; a gazebo, hot tub or tank needs a thicker slab and a well-compacted base, and a tank base may have engineering requirements.
Joints in a round slab
Radial joints from the center keep cracks in check. On larger circles, a ring joint partway out keeps the outer panels from getting too long and narrow.
Questions people ask
How many yards of concrete for a 14 ft round slab?
About 1.90 cubic yards at 4 inches.
How many square feet is a 14 ft circle?
About 153.9 square feet.
How many 80 lb bags for a 14 ft round slab?
About 86 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 many 80 lb bags make a cubic yard?
About 45. Each 80 lb bag yields roughly 0.6 cubic feet, and a cubic yard is 27 cubic feet.
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 10 Foot Round Slab?
- How Much Concrete for a 12 Foot Round Slab?
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