Foundation Drainage Calculator
Estimate foundation-drain pipe rolls, drainage-stone volume, filter-fabric area and planning cost from perimeter length and editable trench dimensions.
Default project preview
2 pipe rolls
Drainage stone
6.52 yd³
Filter fabric
528 ft²
Fabric rolls
2
Purchased pipe length
200 ft
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 = perimeter × trench width × stone depth × allowance. Fabric area approximates perimeter × (trench width + two side depths) × overlap factor. Pipe and fabric rolls are rounded up.
FAQ
Foundation Drainage Calculator questions
Does this include waterproofing membrane?+
No. Waterproofing, protection board and drainage mat are separate materials.
Why wrap the stone with fabric?+
Filter fabric may help separate soil from drainage aggregate when specified for the assembly.
Is the entered perimeter always the pipe length?+
Add routing to outlets, cleanouts, sumps and connections when those lengths are not included in the perimeter.