How Many Blocks for a 20 ft × 2 ft wall?
This calculator is pre-filled to estimate the blocks for a 20 ft × 2 ft wall. Change any field to match your project, and enter your local price for a precise cost.
Retaining Wall Block calculator
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How to estimate retaining wall block
- Walls over 3-4 feet usually need engineering and a permit. Check local code before building.
- Bury the first course at least one block height below grade and set it on compacted gravel.
- Add cap blocks for the top course and geogrid for taller walls - both are separate line items.
Frequently asked questions
How many retaining wall blocks do I need?
Multiply wall length by height for face area, then about 1.5 standard blocks per square foot. Add 5% for breakage and buried courses.