How to use this calculator
- 01Enter exposed wall length and average exposed height.
- 02Enter the block face length and installed course height.
- 03Choose whether caps are needed and add an allowance for cuts and breakage.
Assumptions and limitations
What the estimate assumes
- The wall is straight and has a uniform exposed height.
- Block dimensions represent installed face coverage.
- Full courses and individual units are rounded up.
What it does not determine
- Buried base courses, corners, curves, batter, reinforcement, drainage, backfill, and engineering are not calculated.
- Retaining walls can fail and cause injury or property damage.
- Confirm manufacturer instructions, permits, utilities, surcharge loads, drainage, and engineering requirements before construction.
Frequently asked questions
Does this include the buried base course?
No. The input is exposed height. Add required buried courses according to the wall system and approved design.
How are caps calculated?
Cap count uses wall length divided by the entered block face length, then applies the selected allowance and rounds up.
When does a retaining wall need engineering?
Requirements depend on height, loads, soil, drainage, location, and local rules. Check with the authority having jurisdiction and a qualified professional.