Retaining Wall Calculator
Estimate the block courses, total blocks, cap blocks, drainage gravel, and geogrid layers for a segmental retaining wall.
Enter the wall length and height plus the block face dimensions, and the calculator works out how many courses tall and how many blocks per course you need. Walls over three feet usually call for geogrid reinforcement layers, which the tool flags. Tall or load-bearing walls should be engineered.
| Cap blocks | |
| Wall face area | |
| Gravel backfill | |
| Drainage aggregate | |
| Geogrid layers |
Estimate only. Walls taller than about 3 to 4 feet or holding back a slope or structure should be designed by an engineer.