Retaining Wall Drainage Stone Calculator
Estimate clean drainage stone behind a retaining wall from wall length, drainage-zone width, average height, waste, density and bag or bulk pricing.
Default project preview
6.11 yd³
Base stone volume
5.56 yd³
Estimated weight
8.56 short tons
Bag count
343
Bulk cost
$415.56
Calculator
Build the material order
Your order will appear here
Enter the project details and calculate a rounded material estimate.
Methodology
Transparent calculation
BuildMeter converts every input to a consistent internal unit, applies the selected allowance, and rounds products up to whole purchasable units.
Stone volume = wall length × drainage-zone width × average height. Allowance is added before converting volume to weight and full bags.
BuildMeter Guides
Understand the measurements and assumptions
Use these visible reference guides before changing project inputs or planning allowances.
FAQ
Retaining Wall Drainage Stone Calculator questions
What stone should be used behind a retaining wall?+
Use the clean, free-draining aggregate specified by the wall-system supplier or project designer.
Does this include the leveling pad?+
No. The calculation covers only the drainage zone entered behind the wall.
Why is density editable?+
Aggregate weight varies by rock type, grading, moisture and void content.