How much retaining wall for a 20 ft long × 4 ft high?
A 20 ft long × 4 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
168blocks
Exact need: 160 blocks · plus 5% waste allowance
Material cost
$420–$1,344
Installed (US avg)
$2,120–$3,644
Shopping list
| ITEM | QTY | PRICE RANGE |
|---|---|---|
| blocks | 168 | $420–$1,344 |
| Estimated material total | $420–$1,344 |
Companion materials
- Gravel base (6 in): ≈ 0.54 tons