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SlabCosts
Prices updated January 2026

10×12 Concrete Slab Cost

A 10×12 slab covers 120 square feet. Here's the concrete, bags and cost for 2026 — a common size for a patio.

Concrete (4", waste in)

1.63 yd³

74 × 80 lb bags

Materials (ready-mix)

$264 – $485

delivered, 4" slab

Installed by a pro

$660 – $1,440

4" slab, national average

10×12 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

$660 – $1,440

120 sq ft · 1.63 yd³ concrete

Bags of concrete needed (rounded up)

74

80 lb

98

60 lb

118

50 lb

147

40 lb

Ready-mix (delivered)
$264 – $485
Bagged mix (80 lb, DIY)
$407 – $666
Installed by a pro
$660 – $1,440

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

Installed $660 – $1,440

10×12 slab cost by thickness

Thickness Concrete 80 lb bags Ready-mix Installed
4" 1.63 yd³ 74 $264 – $485 $660 – $1,440
5" 2.04 yd³ 92 $315 – $562 $750 – $1,530
6" 2.44 yd³ 110 $366 – $639 $840 – $1,620

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

1.7 yd³

4" compacted base under the slab

≈ $51 – $111

Open calculator
Rebar

9 sticks

#4 bar, 18" grid (16 bars)

≈ $63 – $117

Open calculator
Bedding sand

0.37 yd³

~1" leveling layer

≈ $10 – $21

Open calculator

10×12 concrete slab: what to expect

A 10×12 slab covers 120 square feet. At the standard 4" thickness it takes about 1.63 cubic yards of concrete once you allow 10% for waste, which is roughly 74 × 80 lb bags if you mix by hand. Stepping up to 6" — sensible if it'll carry a vehicle — raises that to about 2.44 cubic yards.

Budget around $660 – $1,440 to have a 4" slab this size poured and finished by a contractor, or roughly $264 – $485 in ready-mix if you're doing the labor yourself. On top of the concrete you'll need about 1.7 yd³ of gravel base and 9 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
8×8 0.87 yd³ 40 $352 – $768
8×10 1.09 yd³ 49 $440 – $960
10×10 1.36 yd³ 62 $550 – $1,200
12×12 1.96 yd³ 88 $792 – $1,728
12×16 2.61 yd³ 118 $1,056 – $2,304
14×14 2.66 yd³ 120 $1,078 – $2,352

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 10×12 concrete slab cost?
A 10×12 slab (120 sq ft) costs about $660 – $1,440 installed at 4" thick in 2026, or $840 – $1,620 at 6". DIY in materials, the ready-mix runs about $264 – $485 at 4".
How many yards of concrete for a 10×12 slab?
At 4" thick a 10×12 slab needs about 1.63 cubic yards including 10% waste (1.48 yd³ net). At 6" it needs about 2.44 cubic yards.
How many bags of concrete for a 10×12 slab?
At 4" you'd need roughly 74 × 80 lb bags, 98 × 60 lb bags or 147 × 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 10×12 slab need?
Plan on about 1.7 cubic yards of compacted gravel base and roughly 9 sticks of #4 rebar on an 18" grid. The "You'll also need" cards size these for you.