Retaining Wall Calculator
Combines face area block estimate with gravel volumes for base and back drain zone.
Step 1: Units
Step 2
Enter project measurements
Use decimals if needed (e.g. 3.5).
Step 3
How to use this calculator
Enter wall length, average exposed height, backfill width behind face, and base thickness.
What the math is doing
Blocks from face sf × 1.33; base strip 4 ft wide; drain volume = length × height × backfill width.
Frequently asked questions
Geogrid layers?
Not included in block count.
Engineering?
Heights usually require design.
Drain pipe?
Add pipe SKU separately.
Cap units?
Linear feet of caps.