Retaining wall block calculator
Wall length
ft
Exposed wall height
ft
Height above ground
Buried courses
rows
Usually 1 row below grade
Block size (face)
Small: 12 × 4 in
Medium: 16 × 6 in
Large: 18 × 8 in
Custom size
Block length
in
Block height
in
Cap stones
Yes
No
Extra for waste
%
5–10% covers spills, settling and uneven ground
You'll need
Free calculator by Backyard Numbers ↗