Cost guide · updated June 2026
Concrete Slab Cost (2026): Prices by Size
What slabs really cost installed, what drives the range, and how to keep a quote honest.
Most residential concrete slabs cost $6–$12 per square foot installed in 2026. A 24×24 garage slab lands roughly between $3,500 and $7,000. Material is the smaller share: the ready-mix itself is usually only a quarter to a third of the bill, with labor, forming, grading, base, and finishing making up the rest.
The table below shows common slab sizes with the concrete you'd order and the installed range to expect. Every size links to a pre-filled calculator so you can adjust thickness and price to your job.
Want exact quantities first? Use the free
concrete slab calculator; it feeds this
guide's numbers. For prices across every project type, see the national
Concrete Cost Index.
Slab cost by size
Concrete to order at 4″ thick (with 10% waste) and typical installed
price ranges. Cost data updated June 2026.
| Size | Area | Concrete | Installed range |
|---|
| 4×4 slab | 16 sq ft | 0.22 yd³ | $96 – $192 |
|---|
| 5×5 slab | 25 sq ft | 0.34 yd³ | $150 – $300 |
|---|
| 6×6 slab | 36 sq ft | 0.49 yd³ | $216 – $432 |
|---|
| 8×8 slab | 64 sq ft | 0.87 yd³ | $384 – $768 |
|---|
| 10×10 slab | 100 sq ft | 1.36 yd³ | $600 – $1,200 |
|---|
| 10×12 slab | 120 sq ft | 1.63 yd³ | $720 – $1,440 |
|---|
| 10×20 slab | 200 sq ft | 2.72 yd³ | $1,200 – $2,400 |
|---|
| 12×12 slab | 144 sq ft | 1.96 yd³ | $864 – $1,728 |
|---|
| 12×16 slab | 192 sq ft | 2.61 yd³ | $1,152 – $2,304 |
|---|
| 12×20 slab | 240 sq ft | 3.26 yd³ | $1,440 – $2,880 |
|---|
| 12×24 slab | 288 sq ft | 3.91 yd³ | $1,728 – $3,456 |
|---|
| 16×16 slab | 256 sq ft | 3.48 yd³ | $1,536 – $3,072 |
|---|
| 16×20 slab | 320 sq ft | 4.35 yd³ | $1,920 – $3,840 |
|---|
| 20×20 slab | 400 sq ft | 5.43 yd³ | $2,400 – $4,800 |
|---|
| 20×24 slab | 480 sq ft | 6.52 yd³ | $2,880 – $5,760 |
|---|
| 24×24 slab | 576 sq ft | 7.82 yd³ | $3,456 – $6,912 |
|---|
| 24×30 slab | 720 sq ft | 9.78 yd³ | $4,320 – $8,640 |
|---|
| 24×36 slab | 864 sq ft | 11.73 yd³ | $5,184 – $10,368 |
|---|
| 30×30 slab | 900 sq ft | 12.22 yd³ | $5,400 – $10,800 |
|---|
| 30×40 slab | 1,200 sq ft | 16.30 yd³ | $7,200 – $14,400 |
|---|
| 40×60 slab | 2,400 sq ft | 32.59 yd³ | $14,400 – $28,800 |
|---|
| 40×80 slab | 3,200 sq ft | 43.46 yd³ | $19,200 – $38,400 |
|---|
Installed ranges are regional ballparks covering labor, forming,
base, and finishing, not quotes. Click a size for its pre-filled calculator. See the full concrete slab cost guide for what drives the range.
Thickness
Going from 4″ to 6″ adds 50% more concrete. Patios and shed floors are fine at 4″; anything carrying vehicles wants 5–6″ and often more rebar, both of which move the price.
Site preparation
Tear-out of old concrete, tree roots, poor drainage, or out-of-level lots can add more than the slab itself. A flat, accessible, well-drained site is the cheap scenario.
Finish and reinforcement
Broom finish is baseline. Stamped, stained, or polished finishes can add $3–$10+/sq ft. Wire mesh is standard; rebar grids and thickened edges add material and labor.
Region and access
Labor rates vary widely by metro, and a pump truck (needed when the chute can't reach) adds several hundred dollars.
Common questions
How much does a concrete slab cost per square foot?
Most residential slabs run $6–$12 per square foot installed in 2026, including excavation, base, forming, 4" of concrete, and a broom finish. Decorative finishes, thicker pours, and difficult sites push it higher.
How much does a 24x24 slab cost?
A 24x24 slab (576 sq ft) typically lands between $3,500 and $7,000 installed, depending on thickness, finish, and region. Material alone, about 7.8 cubic yards with waste, is roughly $1,250 of that at $160/yd³.
Is it cheaper to pour a slab yourself?
On a small pad, yes: you pay for material, rental tools, and your weekend. Past a single truckload (about 10 cubic yards) or anything structural, finishing speed matters more than enthusiasm; concrete doesn't wait, and fixing a bad pour costs more than hiring would have.