4×4 Concrete Slab Cost
A 4×4 slab covers 16 square feet. Here's the concrete, bags and cost for 2026 — a common size for a small pad / AC unit.
Concrete (4", waste in)
0.22 yd³
10 × 80 lb bags
Materials (ready-mix)
$87 – $216
delivered, 4" slab
Installed by a pro
$88 – $192
4" slab, national average
4×4 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
$88 – $192
16 sq ft · 0.22 yd³ concrete
Bags of concrete needed (rounded up)
10
80 lb
14
60 lb
16
50 lb
20
40 lb
- Ready-mix (delivered)
- $87 – $216
- Bagged mix (80 lb, DIY)
- $55 – $90
- Installed by a pro
- $88 – $192
Estimate only — not a quote. Bag counts are rounded up and include a 10% waste allowance.
4×4 slab cost by thickness
| Thickness | Concrete | 80 lb bags | Ready-mix | Installed |
|---|---|---|---|---|
| 4" | 0.22 yd³ | 10 | $87 – $216 | $88 – $192 |
| 5" | 0.27 yd³ | 13 | $94 – $227 | $100 – $204 |
| 6" | 0.33 yd³ | 15 | $101 – $237 | $112 – $216 |
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.
4×4 concrete slab: what to expect
A 4×4 slab covers 16 square feet. At the standard 4" thickness it takes about 0.22 cubic yards of concrete once you allow 10% for waste, which is roughly 10 × 80 lb bags if you mix by hand. Stepping up to 6" — sensible if it'll carry a vehicle — raises that to about 0.33 cubic yards.
Budget around $88 – $192 to have a 4" slab this size poured and finished by a contractor, or roughly $87 – $216 in ready-mix if you're doing the labor yourself. On top of the concrete you'll need about 0.23 yd³ of gravel base and 2 sticks of rebar.
Compare nearby sizes
Planning something bigger or smaller? Jump straight to the cost for a nearby size.
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: