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SlabCosts
Prices updated January 2026

1,000 sq ft Concrete Slab Cost

A 1,000 sq ft slab (about 25×40 ft) covers 1,000 square feet. Here's the concrete, bags and cost for 2026 — a common size for a large garage / shop.

Concrete (4", waste in)

13.58 yd³

612 × 80 lb bags

Materials (ready-mix)

$1,698 – $2,580

delivered, 4" slab

Installed by a pro

$5,500 – $12,000

4" slab, national average

1,000 sq ft 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

$5,500 – $12,000

1,000 sq ft · 13.58 yd³ concrete

Bags of concrete needed (rounded up)

612

80 lb

815

60 lb

978

50 lb

1,223

40 lb

Ready-mix (delivered)
$1,698 – $2,580
Bagged mix (80 lb, DIY)
$3,366 – $5,508
Installed by a pro
$5,500 – $12,000

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

Installed $5,500 – $12,000

1,000 sq ft slab cost by thickness

Thickness Concrete 80 lb bags Ready-mix Installed
4" 13.58 yd³ 612 $1,698 – $2,580 $5,500 – $12,000
5" 16.98 yd³ 764 $2,122 – $3,225 $6,250 – $12,750
6" 20.37 yd³ 917 $2,546 – $3,870 $7,000 – $13,500

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

14.2 yd³

4" compacted base under the slab

≈ $426 – $923

Open calculator
Rebar

68 sticks

#4 bar, 18" grid (44 bars)

≈ $476 – $884

Open calculator
Bedding sand

3.09 yd³

~1" leveling layer

≈ $86 – $179

Open calculator

1,000 sq ft concrete slab: what to expect

A 1,000 sq ft slab (about 25×40 ft) covers 1,000 square feet. At the standard 4" thickness it takes about 13.58 cubic yards of concrete once you allow 10% for waste, which is roughly 612 × 80 lb bags if you mix by hand. Stepping up to 6" — sensible if it'll carry a vehicle — raises that to about 20.37 cubic yards.

Budget around $5,500 – $12,000 to have a 4" slab this size poured and finished by a contractor, or roughly $1,698 – $2,580 in ready-mix if you're doing the labor yourself. On top of the concrete you'll need about 14.2 yd³ of gravel base and 68 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
20×40 10.86 yd³ 489 $4,400 – $9,600
30×30 12.22 yd³ 550 $4,950 – $10,800
24×40 13.04 yd³ 587 $5,280 – $11,520
30×40 16.3 yd³ 734 $6,600 – $14,400
30×50 20.37 yd³ 917 $8,250 – $18,000
1,500 sq ft 20.37 yd³ 917 $8,250 – $18,000

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 1,000 sq ft concrete slab cost?
A 1,000 sq ft slab (1,000 sq ft) costs about $5,500 – $12,000 installed at 4" thick in 2026, or $7,000 – $13,500 at 6". DIY in materials, the ready-mix runs about $1,698 – $2,580 at 4".
How many yards of concrete for a 1,000 sq ft slab?
At 4" thick a 1,000 sq ft slab needs about 13.58 cubic yards including 10% waste (12.35 yd³ net). At 6" it needs about 20.37 cubic yards.
How many bags of concrete for a 1,000 sq ft slab?
At 4" you'd need roughly 612 × 80 lb bags, 815 × 60 lb bags or 1,223 × 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 1,000 sq ft slab need?
Plan on about 14.2 cubic yards of compacted gravel base and roughly 68 sticks of #4 rebar on an 18" grid. The "You'll also need" cards size these for you.