Prices updated January 2026

50×50 Concrete Slab Cost

A 50×50 slab covers 2,500 square feet. Here's the concrete, bags and cost for 2026 — a common size for a commercial pad.

Concrete (4", waste in)

33.95 yd³

1,528 × 80 lb bags

Materials (ready-mix)

$4,244 – $6,451

delivered, 4" slab

Installed by a pro

$13,750 – $30,000

4" slab, national average

50×50 slab cost calculator

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

Width (ft)

Length (ft)

Thickness (in)

Waste & region

Waste factor (%)

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

Region (cost)

Installed cost estimate

$13,750 – $30,000

2,500 sq ft · 33.95 yd³ concrete

Bags of concrete needed (rounded up)

1,528

80 lb

2,038

60 lb

2,445

50 lb

3,056

40 lb

Ready-mix (delivered): $4,244 – $6,451
Bagged mix (80 lb, DIY): $8,404 – $13,752
Installed by a pro: $13,750 – $30,000

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

Installed $13,750 – $30,000

50×50 slab cost by thickness

Thickness	Concrete	80 lb bags	Ready-mix	Installed
4"	33.95 yd³	1,528	$4,244 – $6,451	$13,750 – $30,000
5"	42.44 yd³	1,910	$5,305 – $8,063	$15,625 – $31,875
6"	50.93 yd³	2,292	$6,366 – $9,676	$17,500 – $33,750

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

35.49 yd³

4" compacted base under the slab

≈ $1,065 – $2,307

Open calculator

Rebar

170 sticks

#4 bar, 18" grid (68 bars)

≈ $1,190 – $2,210

Open calculator

Bedding sand

7.72 yd³

~1" leveling layer

≈ $216 – $448

Open calculator

50×50 concrete slab: what to expect

A 50×50 slab covers 2,500 square feet. At the standard 4" thickness it takes about 33.95 cubic yards of concrete once you allow 10% for waste, which is roughly 1,528 × 80 lb bags if you mix by hand. Stepping up to 6" — sensible if it'll carry a vehicle — raises that to about 50.93 cubic yards.

Budget around $13,750 – $30,000 to have a 4" slab this size poured and finished by a contractor, or roughly $4,244 – $6,451 in ready-mix if you're doing the labor yourself. On top of the concrete you'll need about 35.49 yd³ of gravel base and 170 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
30×60	24.44 yd³	1,100	$9,900 – $21,600
40×50	27.16 yd³	1,223	$11,000 – $24,000
40×60	32.59 yd³	1,467	$13,200 – $28,800
40×80	43.46 yd³	1,956	$17,600 – $38,400

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 50×50 concrete slab cost?

A 50×50 slab (2,500 sq ft) costs about $13,750 – $30,000 installed at 4" thick in 2026, or $17,500 – $33,750 at 6". DIY in materials, the ready-mix runs about $4,244 – $6,451 at 4".

How many yards of concrete for a 50×50 slab?

At 4" thick a 50×50 slab needs about 33.95 cubic yards including 10% waste (30.86 yd³ net). At 6" it needs about 50.93 cubic yards.

How many bags of concrete for a 50×50 slab?

At 4" you'd need roughly 1,528 × 80 lb bags, 2,038 × 60 lb bags or 3,056 × 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 50×50 slab need?

Plan on about 35.49 cubic yards of compacted gravel base and roughly 170 sticks of #4 rebar on an 18" grid. The "You'll also need" cards size these for you.