Retaining Wall Block Calculator
Default 1.33 blocks per sf — replace with your system’s tables from the manufacturer.
Reviewed by MaterialNeeded Editorial Team, Editorial review for field workflows and ordering assumptions.
Step 1: Units
Step 2
Enter project measurements
Use decimals if needed (e.g. 3.5).
Step 3
How to use this calculator
Enter exposed face area (length × average exposed height).
What the math is doing
Blocks ≈ sf × 1.33 × (1+waste).
Frequently asked questions
Geogrid layers?
Not counted as blocks.
Cap units?
Add linear feet of caps separately.
Batter?
Use average height for stepped walls.
Drainage stone?
Use French drain or gravel calculators.