Retaining Wall Backfill Calculator
Models a prismatic drainage zone: wall length × backfill width × height.
Step 1: Units
Step 2
Enter project measurements
Use decimals if needed (e.g. 3.5).
Step 3
How to use this calculator
Height is average exposed wall height; width is clear crushed zone behind face units.
What the math is doing
Volume = length × width × height.
Frequently asked questions
Drain pipe?
Add pipe displacement only if significant.
Geotextile?
Wrap zones per detail.
Chimney drains?
Vertical drainage separate.
Compaction?
Follow wall supplier spec.