Last updated: March 2026
Calculate exactly how much concrete you need for slabs, footings, columns, stairs, and curbs. Get accurate volume measurements, bag counts, and cost estimates.
Typical concrete amounts needed for common projects (4" thick slabs):
| Project Size | Cubic Yards | 60lb Bags | 80lb Bags |
|---|---|---|---|
| 10' × 10' patio | 1.23 yd³ | 67 bags | 50 bags |
| 12' × 12' shed pad | 1.78 yd³ | 96 bags | 72 bags |
| 20' × 20' driveway | 4.94 yd³ | 267 bags | 200 bags |
| 24' × 24' garage pad | 7.11 yd³ | 384 bags | 288 bags |
| 4' × 4' × 3' footing | 1.78 yd³ | 96 bags | 72 bags |