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SlabCosts
Prices updated January 2026

40×50 Concrete Slab Cost

A 40×50 slab covers 2,000 square feet. Here's the concrete, bags and cost for 2026 — a common size for a warehouse pad.

Concrete (4", waste in)

27.16 yd³

1,223 × 80 lb bags

Materials (ready-mix)

$3,395 – $5,161

delivered, 4" slab

Installed by a pro

$11,000 – $24,000

4" slab, national average

40×50 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

$11,000 – $24,000

2,000 sq ft · 27.16 yd³ concrete

Bags of concrete needed (rounded up)

1,223

80 lb

1,630

60 lb

1,956

50 lb

2,445

40 lb

Ready-mix (delivered)
$3,395 – $5,161
Bagged mix (80 lb, DIY)
$6,727 – $11,007
Installed by a pro
$11,000 – $24,000

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

Installed $11,000 – $24,000

40×50 slab cost by thickness

Thickness Concrete 80 lb bags Ready-mix Installed
4" 27.16 yd³ 1,223 $3,395 – $5,161 $11,000 – $24,000
5" 33.95 yd³ 1,528 $4,244 – $6,451 $12,500 – $25,500
6" 40.74 yd³ 1,834 $5,093 – $7,741 $14,000 – $27,000

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

28.39 yd³

4" compacted base under the slab

≈ $852 – $1,846

Open calculator
Rebar

136 sticks

#4 bar, 18" grid (61 bars)

≈ $952 – $1,768

Open calculator
Bedding sand

6.17 yd³

~1" leveling layer

≈ $173 – $358

Open calculator

40×50 concrete slab: what to expect

A 40×50 slab covers 2,000 square feet. At the standard 4" thickness it takes about 27.16 cubic yards of concrete once you allow 10% for waste, which is roughly 1,223 × 80 lb bags if you mix by hand. Stepping up to 6" — sensible if it'll carry a vehicle — raises that to about 40.74 cubic yards.

Budget around $11,000 – $24,000 to have a 4" slab this size poured and finished by a contractor, or roughly $3,395 – $5,161 in ready-mix if you're doing the labor yourself. On top of the concrete you'll need about 28.39 yd³ of gravel base and 136 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
1,500 sq ft 20.37 yd³ 917 $8,250 – $18,000
40×40 21.73 yd³ 978 $8,800 – $19,200
30×60 24.44 yd³ 1,100 $9,900 – $21,600
40×60 32.59 yd³ 1,467 $13,200 – $28,800
50×50 33.95 yd³ 1,528 $13,750 – $30,000
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 40×50 concrete slab cost?
A 40×50 slab (2,000 sq ft) costs about $11,000 – $24,000 installed at 4" thick in 2026, or $14,000 – $27,000 at 6". DIY in materials, the ready-mix runs about $3,395 – $5,161 at 4".
How many yards of concrete for a 40×50 slab?
At 4" thick a 40×50 slab needs about 27.16 cubic yards including 10% waste (24.69 yd³ net). At 6" it needs about 40.74 cubic yards.
How many bags of concrete for a 40×50 slab?
At 4" you'd need roughly 1,223 × 80 lb bags, 1,630 × 60 lb bags or 2,445 × 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 40×50 slab need?
Plan on about 28.39 cubic yards of compacted gravel base and roughly 136 sticks of #4 rebar on an 18" grid. The "You'll also need" cards size these for you.