Free to use, no account
Retaining Wall Calculator
Estimate blocks for one straight wall and rectangular base/backfill quantities from dimensions you enter. Adjust block sizes, joint thickness and extra material.
How do I estimate retaining-wall blocks?
Divide wall height by the block height plus joint thickness and round up to whole courses. Divide wall length by the block length plus joint thickness and round up to blocks per course. This simple estimate does not create a staggered layout or cut plan.
Frequently asked questions
How do I estimate retaining-wall blocks?
Divide wall height by the block height plus joint thickness and round up to whole courses. Divide wall length by the block length plus joint thickness and round up to blocks per course. This simple estimate does not create a staggered layout or cut plan.
Are my wall measurements uploaded?
No. This material estimate runs locally in your browser; the dimensions are not sent to a server or saved by this tool.
Does this calculate whether a retaining wall is safe?
No. It estimates simple material quantities only. It does not analyze soil pressure, drainage, reinforcement, foundations, loads, stability or code. Have a qualified professional design and review a retaining wall before building.
Why enter base and backfill dimensions myself?
Required dimensions depend on soil, drainage, wall system, loads and local conditions. The calculator uses only the rectangular dimensions you enter and does not prescribe a base or backfill design.