Concrete Slab Cost Calculator

1. Enter the slab length, width and thickness and a 5 to 10 percent waste allowance for the concrete.
2. Enter the concrete price per cubic yard and any delivery or short-load fee from your supplier.
3. Add the labor and finishing rates per square foot, and any flat other costs like formwork, rebar or removal.
4. Read the result: the total cost, the cost per square foot, and the split between material, labor and finishing.

Here is what each result line means:

A concrete slab cost calculator estimates the full cost to pour a slab, not just the concrete. It splits the job into the three things you actually pay for: material by the cubic yard, labor by the square foot, and finishing or extras.

A standard 4 inch slab commonly runs about 4 to 8 dollars a square foot installed, and a 6 inch vehicle slab 6 to 10 dollars, though prices swing with region, finish and site. The tool lets you enter your own quotes so the estimate is yours, not a national average. To size the concrete on its own, use the concrete cost calculator; to work out the mix, the concrete mix calculator or the cement calculator.

The tool prices the two parts of a slab job separately, because they scale differently. Concrete is bought by volume, so it is priced by the cubic yard; labor and finishing track the surface, so they are priced by the square foot.

1. Find the concrete volume in cubic yards, with waste, and multiply by the price per yard, plus any delivery fee.
2. Multiply the slab area by the labor rate per square foot.
3. Multiply the area by the finishing rate, and add any flat extras like formwork or rebar.
4. Add the three parts for the total, and divide by the area for the cost per square foot.

Suppose you are pouring a patio 12 feet by 12 feet at 4 inches, with concrete at $160 a yard, labor at $4 a square foot, a $1 finish and 10 percent waste.

Calculation: the slab is 144 square feet and about 1.96 cubic yards with waste. Material is 1.96 x $160 = $313. Labor is 144 x $4 = $576. Finishing is 144 x $1 = $144. The total is $1,033, or about $7.17 a square foot, within the typical 4 to 8 dollar range.

The lesson: the concrete is only about a third of the bill. Labor and finishing are the larger share on most slabs, which is why a cheaper yard of concrete rarely changes the total much.

Size and Thickness

Area sets the labor and finishing; thickness sets the concrete. A thicker vehicle slab costs more on both counts, which is why a driveway runs above a patio per square foot.

Finish

A plain broom finish is the baseline. Stamped, colored, exposed-aggregate or polished finishes add several dollars a square foot, and are the usual reason a slab lands at the top of the range.

Site and Access

A tight site, a long pump or barrow run, poor ground or removing an old slab all add labor and flat costs that the square-foot rate alone misses.

Reinforcement and Sub-base

Rebar, wire mesh and a thicker gravel base add material and labor. Enter them as finishing-per-foot or flat extras so they are not left out.

These are current industry estimates, useful as a sanity check against a quote; your actual price depends on region, finish and site conditions.

Ready-mix concrete alone is about 130 to 200 dollars a cubic yard delivered. Enter your own numbers above for an estimate that matches your market.

Budgeting Before You Call Contractors

Get a realistic range first, so a quote that is far above or below it is a flag to ask why.

Comparing Quotes

Break each quote into material, labor and finishing and compare on the same basis, rather than on the headline total alone.

Deciding on a Finish

Price a basic finish against a decorative one to see what the upgrade actually adds across the whole slab.

1. Pricing Concrete Only

The ready-mix is often just a third of the bill. Leaving out labor and finishing understates the cost badly.

2. Ignoring the Short-load Fee

A small slab pays a surcharge on a part-truck delivery. Enter it, or the material cost looks lower than the invoice.

3. Forgetting Site Prep and Removal

Excavation, a gravel base and tearing out an old slab are real costs. Add them as flat extras.

4. Using a National Average as Your Price

Rates vary by region and season. A headline figure is a sanity check, not a quote; enter local numbers.

5. Leaving Out Tax and Permits

This estimate is pre-tax and excludes permits. Add them before you treat the total as the final budget.

The arithmetic is exact; the estimate is only as good as the prices and rates you enter, which vary widely by region, season and site.

A standard 4 inch slab commonly runs about 4 to 8 dollars a square foot installed, averaging around 6, and a 6 inch vehicle slab about 6 to 10. The total depends on size, finish, reinforcement and your region, so enter your own prices above for an estimate that fits your job.

At typical rates, a 12 by 12 foot patio at 4 inches is roughly 1,000 to 1,150 dollars, around 7 to 8 dollars a square foot, with concrete, labor and a basic finish. Enter your prices above for your own figure.

Usually not. Ready-mix is often only about a third of the total; labor and finishing are the larger share. That is why a slightly cheaper yard of concrete rarely moves the final price much.

Placing and finishing labor is often a few dollars a square foot for a plain finish, more for decorative work. It is the single biggest line on most slabs. Enter a labor rate above to see its share.

Commonly about 130 to 200 dollars a cubic yard delivered, before any short-load fee on a small order. Prices vary by region and supplier, so use your own quote; the tool defaults to a mid-range figure you can change.

Yes, on both counts: more concrete by volume and often more labor and reinforcement. Moving a slab from 4 to 6 inches adds half as much concrete again, which is why vehicle slabs cost more per square foot than patios.

A decorative finish and difficult site conditions. Stamped, colored or polished finishes add several dollars a square foot, and poor access, removal of an old slab or extra reinforcement add labor and flat costs.

No. The estimate is pre-tax and excludes permits, inspection and unforeseen ground conditions. Add those before you treat the total as your final budget.

No. The calculation runs entirely in your browser and nothing you enter is stored or sent anywhere.

• RemodelAI, concrete slab cost guide (2026 estimates) (installed slab 4-8 dollars/sq ft, ready-mix 130-200 dollars/cu yd).
• National Ready Mixed Concrete Association (NRMCA; ready-mixed concrete sold by the cubic yard).
• American Cement Association (American Cement Association; what concrete and cement are).