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SlabCosts
Prices updated January 2026

30×60 Concrete Slab Cost

A 30×60 slab covers 1,800 square feet. Here's the concrete, bags and cost for 2026 — a common size for a pole barn.

Concrete (4", waste in)

24.44 yd³

1,100 × 80 lb bags

Materials (ready-mix)

$3,056 – $4,644

delivered, 4" slab

Installed by a pro

$9,900 – $21,600

4" slab, national average

30×60 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

$9,900 – $21,600

1,800 sq ft · 24.44 yd³ concrete

Bags of concrete needed (rounded up)

1,100

80 lb

1,467

60 lb

1,760

50 lb

2,200

40 lb

Ready-mix (delivered)
$3,056 – $4,644
Bagged mix (80 lb, DIY)
$6,050 – $9,900
Installed by a pro
$9,900 – $21,600

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

Installed $9,900 – $21,600

30×60 slab cost by thickness

Thickness Concrete 80 lb bags Ready-mix Installed
4" 24.44 yd³ 1,100 $3,056 – $4,644 $9,900 – $21,600
5" 30.56 yd³ 1,375 $3,820 – $5,806 $11,250 – $22,950
6" 36.67 yd³ 1,650 $4,583 – $6,967 $12,600 – $24,300

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

25.56 yd³

4" compacted base under the slab

≈ $767 – $1,661

Open calculator
Rebar

125 sticks

#4 bar, 18" grid (62 bars)

≈ $875 – $1,625

Open calculator
Bedding sand

5.56 yd³

~1" leveling layer

≈ $156 – $322

Open calculator

30×60 concrete slab: what to expect

A 30×60 slab covers 1,800 square feet. At the standard 4" thickness it takes about 24.44 cubic yards of concrete once you allow 10% for waste, which is roughly 1,100 × 80 lb bags if you mix by hand. Stepping up to 6" — sensible if it'll carry a vehicle — raises that to about 36.67 cubic yards.

Budget around $9,900 – $21,600 to have a 4" slab this size poured and finished by a contractor, or roughly $3,056 – $4,644 in ready-mix if you're doing the labor yourself. On top of the concrete you'll need about 25.56 yd³ of gravel base and 125 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
30×50 20.37 yd³ 917 $8,250 – $18,000
1,500 sq ft 20.37 yd³ 917 $8,250 – $18,000
40×40 21.73 yd³ 978 $8,800 – $19,200
40×50 27.16 yd³ 1,223 $11,000 – $24,000
40×60 32.59 yd³ 1,467 $13,200 – $28,800
50×50 33.95 yd³ 1,528 $13,750 – $30,000

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 30×60 concrete slab cost?
A 30×60 slab (1,800 sq ft) costs about $9,900 – $21,600 installed at 4" thick in 2026, or $12,600 – $24,300 at 6". DIY in materials, the ready-mix runs about $3,056 – $4,644 at 4".
How many yards of concrete for a 30×60 slab?
At 4" thick a 30×60 slab needs about 24.44 cubic yards including 10% waste (22.22 yd³ net). At 6" it needs about 36.67 cubic yards.
How many bags of concrete for a 30×60 slab?
At 4" you'd need roughly 1,100 × 80 lb bags, 1,467 × 60 lb bags or 2,200 × 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 30×60 slab need?
Plan on about 25.56 cubic yards of compacted gravel base and roughly 125 sticks of #4 rebar on an 18" grid. The "You'll also need" cards size these for you.