Construction Calculators

Retaining Wall Calculator

Calculate how many retaining wall blocks are needed to build a wall from its length, height and block dimensions.

Blocks per row —

Rows (courses) —

Total blocks needed —

About the Retaining Wall Calculator

This calculator estimates how many blocks you need to build a segmental retaining wall, based on the wall's overall length and height and the face dimensions of the block you're using.

Formula: Blocks per Row = (Wall Length in inches) ÷ Block Width; Rows = (Wall Height in inches) ÷ Block Height; Total Blocks = Blocks per Row × Rows × (1 + Waste %)

This estimate assumes a straight wall with no setback or curves — walls over about 3-4ft typically need geogrid reinforcement and engineered design, and most systems require a buried base course not visible in the finished height.