Retaining Wall Calculator
Wall blocks
147 blocks
- Courses (rows)
- 7
- Blocks per course
- 20
- Cap blocks
- 21
- Gravel leveling base (24 in × 6 in trench)
- 0.74 cu yd
- Drainage stone (12 in behind wall)
- 1.73 cu yd
- Perforated drain pipe
- 20 ft
- Block cost
- $599
5% waste included. Walls over 3–4 ft usually need geogrid and engineering; check local rules.