How much retaining wall for a 20 ft long × 3 ft high?
A 20 ft long × 3 ft high retaining wall 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
126blocks
Exact need: 120 blocks · plus 5% waste allowance
Material cost
$315–$1,008
Installed (US avg)
$1,590–$2,733
Shopping list
| ITEM | QTY | PRICE RANGE |
|---|---|---|
| blocks | 126 | $315–$1,008 |
| Estimated material total | $315–$1,008 |
Companion materials
- Gravel base (6 in): ≈ 0.54 tons