Concrete cost calculator for your project
Real prices, worked out line by line, with every source named.
A 20×20 ft slab, 4 inches, installed
$3,831
Our national range: $2,874 – $4,789
That's about the size of a two-car garage pad. Put in your own size and ZIP to see yours.
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Pick your project
- Concrete slab cost calculator20x20: $2,874 – $4,789
- Driveway cost calculator40x16: $6,234 – $10,390
- Patio cost calculator12x16: $1,601 – $2,668
- Slab foundation cost calculator30x40: $17,216 – $28,693
- Shed slab cost calculator10x12: $1,074 – $1,790
- Garage slab cost calculator24x24: $6,631 – $11,051
- Asphalt driveway cost calculator40x16: $3,106 – $5,177
Slab already poured but sinking? Price concrete leveling before paying for a replacement.
Working on a floor? Price self-leveling concrete, an epoxy coating or a polished concrete floor, and check rebar or mesh for a new slab.
For a front walk, price a concrete sidewalk by the linear foot. To weigh one project against another, see the concrete cost per square foot of each.
What common slab sizes cost
| Size | About the size of | Area | Concrete at 4 in | Pro installed |
|---|---|---|---|---|
| 10x10 slab | a shed pad or a small patio | 100 sq ft | 1.23 yd³ | $941 – $1,569 |
| 20x20 slab | a two-car garage pad | 400 sq ft | 4.94 yd³ | $2,874 – $4,789 |
| 30x40 slab | a workshop or pole-barn floor | 1,200 sq ft | 14.81 yd³ | $9,664 – $16,106 |
National estimates, not bids. A ZIP on any calculator switches to local labor rates.
Where the numbers come from
- Labor: Bureau of Labor Statistics wages for your metro or state. The same survey gives the hourly wages of carpenters, electricians and plumbers.
- Ready-mix: NRMCA 2023 price, updated monthly with the BLS producer price index. The concrete cost per yard page lists every month since 2023.
- Local rules: your state's sales tax and frost depth.
The engine computes every price; nobody types one in. Read the rules each page follows before it goes live, or see who runs American Build Rate and how it makes money.
How we compute it →