How much concrete for a 30 ft × 40 ft?
A 30 ft × 40 ft concrete project is pre-filled below. Adjust any value to match your exact job.
Your project
Standard size shown by default. Change any value — the answer recomputes instantly.
You need
15.85cubic yards (ready-mix)
Exact need: 14.81 cubic yards (ready-mix) · plus 7% waste allowance
Material cost
$1,981.25–$2,615.25
Installed (US avg)
$6,571–$8,825
Shopping list
| ITEM | QTY | PRICE RANGE |
|---|---|---|
| cubic yards (ready-mix) | 15.85 | $1,981.25–$2,615.25 |
| Estimated material total | $1,981.25–$2,615.25 |
Alternative buy formats
- 714 × 80 lb bags — $3,927–$5,712
- 952 × 60 lb bags — $4,284–$6,664
30 ft × 40 ft at different depths
| Depth | You need | Buy (with waste) | Material cost |
|---|---|---|---|
| 1″ | 3.7 cubic yards (ready-mix) | 3.96 cubic yards (ready-mix) | $495 – $653.4 |
| 2″ | 7.41 cubic yards (ready-mix) | 7.93 cubic yards (ready-mix) | $991.25 – $1,308.45 |
| 3″ | 11.11 cubic yards (ready-mix) | 11.89 cubic yards (ready-mix) | $1,486.25 – $1,961.85 |
| 4″ | 14.81 cubic yards (ready-mix) | 15.85 cubic yards (ready-mix) | $1,981.25 – $2,615.25 |
| 6″ | 22.22 cubic yards (ready-mix) | 23.78 cubic yards (ready-mix) | $2,972.5 – $3,923.7 |