Retaining Wall Block Calculator | LandscapeCalculating.com

Retaining Wall Block CalculatorBlock and cap counts, leveling pad, drainage stone, geogrid and backfill volume.Free retaining wall block calculator with formulas, waste factors, cost estimates and professional guidance.Formula: blocks = courses × (wall length ÷ block face length), where courses = (height + buried course) ÷ block heightHow to use this calculator

Bury the first course 10% of wall height, minimum one full course, on a compacted 6 in stone pad.

Backfill 12 in of clean drainage stone behind the wall with a perforated drain at the base.

Any wall over 4 ft, or with a slope or driveway surcharge, needs engineering and usually a permit.

Frequently asked questions

How many blocks for a retaining wall?

Divide wall length by block face length for blocks per course, then multiply by courses including the buried one.

Do I need geogrid?

Typically yes above 4 ft of exposed height, or lower with a surcharge. Follow the manufacturer and engineer specification.

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