Concrete Cost Calculator
Use the concrete cost calculator below to get an instant material and installed price range for your project. To find how much concrete you need, multiply length × width × thickness to get the volume, then convert to cubic yards (divide cubic feet by 27). Add 5–10% for waste. A 10×10 ft slab at 4 inches needs about 1.23 cubic yards, costing roughly $150–$220 in ready-mix.
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Concrete cost by slab size
Cubic yards and ready-mix material cost for a 4-inch slab. Add labor for a finished price.
| Slab size | Cubic yards (4") | Ready-mix cost | 80 lb bags |
|---|---|---|---|
| 10 × 10 ft | 1.23 yd³ | $150 – $205 | ~56 |
| 12 × 12 ft | 1.78 yd³ | $215 – $295 | ~80 |
| 20 × 20 ft | 4.94 yd³ | $595 – $815 | — |
| 24 × 24 ft | 7.11 yd³ | $855 – $1,175 | — |
Concrete bag yield
How much each bag size yields and how many make a cubic yard.
| Bag size | Yield | Bags per yd³ |
|---|---|---|
| 40 lb | 0.30 ft³ | ~90 |
| 60 lb | 0.45 ft³ | ~60 |
| 80 lb | 0.60 ft³ | ~45 |
What affects concrete cost
- Project size — larger concrete jobs lower the cost per unit but raise the total.
- Material grade — premium products cost more but often last longer.
- Labor rates — local wages and demand swing installed prices significantly.
- Region — prices vary by state and metro (see local cost pages below).
- Site access & prep — removal of old material and difficult access add cost.
- Season — booking in the off-season can cut labor pricing.