8×8 Concrete Slab Cost
A 8×8 slab covers 64 square feet. Here's the concrete, bags and cost for 2026 — a common size for a shed base.
Concrete (4", waste in)
0.87 yd³
40 × 80 lb bags
Materials (ready-mix)
$169 – $340
delivered, 4" slab
Installed by a pro
$352 – $768
4" slab, national average
8×8 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
$352 – $768
64 sq ft · 0.87 yd³ concrete
Bags of concrete needed (rounded up)
40
80 lb
53
60 lb
63
50 lb
79
40 lb
- Ready-mix (delivered)
- $169 – $340
- Bagged mix (80 lb, DIY)
- $220 – $360
- Installed by a pro
- $352 – $768
Estimate only — not a quote. Bag counts are rounded up and include a 10% waste allowance.
8×8 slab cost by thickness
| Thickness | Concrete | 80 lb bags | Ready-mix | Installed |
|---|---|---|---|---|
| 4" | 0.87 yd³ | 40 | $169 – $340 | $352 – $768 |
| 5" | 1.09 yd³ | 49 | $196 – $381 | $400 – $816 |
| 6" | 1.3 yd³ | 59 | $223 – $423 | $448 – $864 |
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.
8×8 concrete slab: what to expect
A 8×8 slab covers 64 square feet. At the standard 4" thickness it takes about 0.87 cubic yards of concrete once you allow 10% for waste, which is roughly 40 × 80 lb bags if you mix by hand. Stepping up to 6" — sensible if it'll carry a vehicle — raises that to about 1.3 cubic yards.
Budget around $352 – $768 to have a 4" slab this size poured and finished by a contractor, or roughly $169 – $340 in ready-mix if you're doing the labor yourself. On top of the concrete you'll need about 0.91 yd³ of gravel base and 5 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: