Retaining Wall Block Calculator
Retaining Wall Block Count
Calculate blocks needed for your retaining wall
Retaining Wall Cost Estimate
Estimate total cost for a retaining wall block project
Formula
Blocks Per Row = Wall Length / Block Length | Courses = Wall Height / Block Height | Total = Rows × Courses × 1.05 | Base Gravel = Length × (Block Depth + 12") / 12 × 0.5'
Frequently Asked Questions
How many retaining wall blocks do I need?
Divide wall length by block length to get blocks per row. Divide wall height by block height to get number of courses. Multiply together and add 5-10% for waste and cuts. Example: 30 ft wall × 3 ft tall with 16" × 6" blocks = 23 blocks/row × 6 courses = 138 blocks + 5% = 145 blocks.
How tall can a retaining wall be without an engineer?
Most building codes allow 3-4 feet without an engineer or permit. Walls over 4 feet typically require a structural engineer, permits, and geogrid reinforcement. Some jurisdictions have stricter limits. Always check with your local building department.
You may also need
~
Retaining Wall Calculator
Free retaining wall calculator. Estimate blocks, base gravel, and drainage stone needed for your wall.
Everyday~
Gravel Calculator
Free gravel calculator. Calculate how much gravel, crushed stone, or mulch you need in tons and cubic yards for your landscaping project.
Everyday~
Concrete Block Calculator
Free concrete block calculator. Calculate how many CMU blocks, mortar bags, and materials you need for your wall project.
Everyday