Concrete Slab Cost Calculator

Installed, a concrete slab runs $6 to $12 per square foot, so a 10x10 pad lands around $600 to $1,200 and a 20x20 patio around $2,400 to $4,800. At 4 inches thick, the concrete itself is only about $2.29 of each square foot. Forms, base prep, finishing, and labor make up the rest.

$2,400 to $4,800 installed at the published $6 to $12 per square foot. The ready-mix alone is about 4.94 cubic yards, or $915 at the current US average of $185.30 per yard. Site prep and the finish you choose decide where in that range the job falls.

About $7,200 to $14,400 installed at $6 to $12 per square foot. At 4 inches thick it takes 14.8 cubic yards, or $2,745 of ready-mix at the current US average. Shop and barn slabs that carry vehicles are usually poured 5 to 6 inches thick, which adds 25 to 50% to the concrete.

$6 to $12 per square foot installed for a standard 4-inch slab. The concrete alone is roughly $2.29 per square foot at that thickness. A thicker slab, rebar, a decorative finish, or hard access pushes the price toward the top of the range.

About $185.30 per cubic yard for ready-mix, as a current US average. That starts from NRMCA's 2024 national weighted average of $179.89 and is carried forward each month with the BLS Producer Price Index for ready-mix concrete. Location moves this price a lot: the posted 3,000 PSI prices on the Concrete Price Index run from $115 a yard in New Jersey to $191 in Florida.

It depends on the supplier. Of the four posted price sheets in the delivery section of our Concrete Price Index, one sets a 1-yard minimum charge, one an $820 minimum for 4 yards or less, one charges $50 more for the first yard, and one lists no minimum. Short-load fees or extra delivery charges apply below about 3 to 6 yards: up to $100 under 3 yards at Townsend Concrete, $85 under 6 yards at American Concrete, and none at Short Load Concrete. These fees make a small pour cost more per yard, and bags usually cost less below about 1 yard.

About 4,000 pounds, or 2 tons, which works out to roughly 150 pounds per cubic foot. The weight matters in two places: whether a loaded truck can get near the pour, and whether the structure underneath can carry it. For a suspended slab or a deck, have an engineer confirm the load. The concrete weight guide covers trucks, trailers, and common pours in more detail.

Yes, though not by much. A 3,000 psi mix is the standard for residential work. Stepping up to 4,000 psi for a driveway or garage floor typically adds a few dollars per cubic yard, and fiber-reinforced or higher-strength mixes cost more. On a typical residential quote, delivery distance and short load fees change the total more than the mix does.

The ready-mix price buys the concrete, delivered, and nothing else. Installed cost adds formwork, rebar or mesh, grading and site prep, the crew that pours and finishes it, equipment, and the contractor's overhead. So a slab with a few hundred dollars of concrete in it can cost several times that once it is poured and finished.

The base price comes from NRMCA's published national average, carried forward each month using the US Bureau of Labor Statistics Producer Price Index for ready-mix concrete. NRMCA publishes its survey only occasionally, while the PPI updates every month, which keeps the figure current between surveys. The full history is on the Concrete Price Index page.