How many retaining wall blocks?
courses = ceiling(exposed height ÷ block height) + buried coursesblocks = blocks per course × courses + allowanceCurves, corners, steps, columns, and partial units change the final order.
Retaining wall calculator
Estimate wall blocks, courses, cap units, and compacted base gravel for a straight segmental retaining wall.
Enter the wall and block dimensions
Use the installed face dimensions of one block, not packaging dimensions.
Separate visible wall height from the complete wall
The exposed face is only part of a segmental retaining wall. Buried courses, leveling pad, cap units, drainage aggregate, geogrid, setbacks, corners, and cuts affect the material list and may affect whether engineering is required.
- Use the manufacturer's actual block face dimensions and coverage.
- Count inside and outside corners according to the selected system.
- Confirm drainage and reinforcement details before excavation.
Know when engineering is required
Wall height is only one factor. Slopes, driveways, buildings, fences, water, poor soils, and other surcharges can require engineered reinforcement even on a relatively short wall.