How Much Concrete for a 10x20 Patio?
A 10 by 20 foot patio is 200 square feet. How much concrete for a 10x20 patio at the common 4-inch thickness: about 2.47 cubic yards. Most people order 2.75 yards to cover waste and an uneven base.
Concrete calculator →The math for a 10x20 patio
- Area: 10 ft × 20 ft = 200 sq ft.
- Thickness in feet: 4 in ÷ 12 = 0.333 ft.
- Volume: 200 × 0.333 = 66.7 cubic feet.
- Cubic yards: 66.7 ÷ 27 = 2.47 yd³.
- With 10% extra: 2.72 yd³.
The concrete calculator runs the same steps for any size and thickness.
Related: How Much Concrete for a 10x20 Driveway?
Concrete for a 10x20 patio by thickness
| Thickness | Cubic feet | Cubic yards | Yards +10% | 80 lb bags | 60 lb bags |
|---|---|---|---|---|---|
| 4 in | 66.7 | 2.47 | 2.72 | 112 | 149 |
| 5 in | 83.3 | 3.09 | 3.40 | 139 | 186 |
| 6 in | 100.0 | 3.70 | 4.07 | 167 | 223 |
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
Four inches is standard for a patio that sees foot traffic and furniture. Slope it about 1/8 to 1/4 inch per foot away from the house so rain runs off, and go thicker under a hot tub or outdoor kitchen.
Related: How Much Concrete for a 10x20 Slab?
Placing the order
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
Uneven ground is the main reason pours run short. Every half inch of extra depth across the patio 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 and reinforcement
Plan the joints before the pour. Panels close to square crack less than long, narrow ones, and joint spacing around 8 feet is typical for a 4-inch slab. Cut joints with a groover while the concrete is soft or with a saw within the first day.
Questions people ask
How many yards of concrete for a 10x20 patio at 4 inches?
About 2.47 cubic yards, or 2.72 with 10 percent extra.
How many yards for a 10x20 patio at 6 inches?
About 3.70 cubic yards.
How many 80 lb bags for a 10x20 patio?
About 112 bags at 4 inches thick, before any waste allowance.
How many square feet is a 10x20 patio?
200 square feet.
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.
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 10x14 Patio?
- How Much Concrete for a 10x16 Patio?
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