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SlabCosts
Prices updated January 2026

24×24 Concrete Slab Cost

A 24×24 slab covers 576 square feet. Here's the concrete, bags and cost for 2026 — a common size for a two-car garage.

Concrete (4", waste in)

7.82 yd³

352 × 80 lb bags

Materials (ready-mix)

$1,038 – $1,661

delivered, 4" slab

Installed by a pro

$3,168 – $6,912

4" slab, national average

24×24 slab cost calculator

Adjust thickness, waste or region — the cost updates live.

Waste & region

Order extra for spillage & uneven subgrade. 10% is typical.

Installed cost estimate

$3,168 – $6,912

576 sq ft · 7.82 yd³ concrete

Bags of concrete needed (rounded up)

352

80 lb

470

60 lb

564

50 lb

704

40 lb

Ready-mix (delivered)
$1,038 – $1,661
Bagged mix (80 lb, DIY)
$1,936 – $3,168
Installed by a pro
$3,168 – $6,912

Estimate only — not a quote. Bag counts are rounded up and include a 10% waste allowance.

Installed $3,168 – $6,912

24×24 slab cost by thickness

Thickness Concrete 80 lb bags Ready-mix Installed
4" 7.82 yd³ 352 $1,038 – $1,661 $3,168 – $6,912
5" 9.78 yd³ 440 $1,282 – $2,033 $3,600 – $7,344
6" 11.73 yd³ 528 $1,467 – $2,229 $4,032 – $7,776

Includes a 10% waste allowance; bag counts rounded up. National US averages, January 2026.

You'll also need

Sized for this exact slab — tap any item to open its calculator with your measurements already filled in.

Gravel base

8.18 yd³

4" compacted base under the slab

≈ $245 – $532

Open calculator
Rebar

41 sticks

#4 bar, 18" grid (34 bars)

≈ $287 – $533

Open calculator
Bedding sand

1.78 yd³

~1" leveling layer

≈ $50 – $103

Open calculator

24×24 concrete slab: what to expect

A 24×24 slab covers 576 square feet. At the standard 4" thickness it takes about 7.82 cubic yards of concrete once you allow 10% for waste, which is roughly 352 × 80 lb bags if you mix by hand. Stepping up to 6" — sensible if it'll carry a vehicle — raises that to about 11.73 cubic yards.

Budget around $3,168 – $6,912 to have a 4" slab this size poured and finished by a contractor, or roughly $1,038 – $1,661 in ready-mix if you're doing the labor yourself. On top of the concrete you'll need about 8.18 yd³ of gravel base and 41 sticks of rebar.

Compare nearby sizes

Planning something bigger or smaller? Jump straight to the cost for a nearby size.

Size Concrete (4") 80 lb bags Installed cost
18×20 4.89 yd³ 220 $1,980 – $4,320
20×20 5.43 yd³ 245 $2,200 – $4,800
20×24 6.52 yd³ 294 $2,640 – $5,760
20×30 8.15 yd³ 367 $3,300 – $7,200
25×25 8.49 yd³ 382 $3,438 – $7,500
24×30 9.78 yd³ 440 $3,960 – $8,640

See all common slab sizes →

Prices updated January 2026 National US averages · reviewed quarterly

Volumes use standard bag yields and a 10% waste allowance; costs are national US averages that vary by region, mix and finish. See our methodology for exactly how each figure is worked out, or check the reference sources:

Slab cost by project

Concrete Slab Cost Cost per sq ft + calculator Garage Slab Cost Typical 20×20 / 24×24 Driveway Slab Cost Concrete vs asphalt Patio Slab Cost 10×10 to 20×20 Shed Base Cost Small pads

Frequently asked questions

How much does a 24×24 concrete slab cost?
A 24×24 slab (576 sq ft) costs about $3,168 – $6,912 installed at 4" thick in 2026, or $4,032 – $7,776 at 6". DIY in materials, the ready-mix runs about $1,038 – $1,661 at 4".
How many yards of concrete for a 24×24 slab?
At 4" thick a 24×24 slab needs about 7.82 cubic yards including 10% waste (7.11 yd³ net). At 6" it needs about 11.73 cubic yards.
How many bags of concrete for a 24×24 slab?
At 4" you'd need roughly 352 × 80 lb bags, 470 × 60 lb bags or 704 × 40 lb bags. That's a lot of mixing — past about a cubic yard, ready-mix is usually cheaper and easier.
What base and rebar does a 24×24 slab need?
Plan on about 8.18 cubic yards of compacted gravel base and roughly 41 sticks of #4 rebar on an 18" grid. The "You'll also need" cards size these for you.