🧱 Retaining Wall Calculator

How to Calculate Retaining Wall Blocks

Divide the wall height by the block height to get the number of rows, and divide the wall length by the block length to get blocks per row. Multiply rows by blocks per row for the total. Standard retaining wall blocks are typically 12″ long × 4″ high or 16″ × 8″.

Retaining Wall Considerations

Walls over 4 feet tall typically require engineering and may need geogrids, drainage, and compacted backfill. Add 10% waste for cuts at corners and ends. Use construction adhesive between courses and always install drainage gravel behind the wall with a perforated drain pipe at the base.