Does this size the perforated pipe or gravel aggregate separately?
Not yet -- this estimates total trench volume only. Pipe diameter and gravel-vs-pipe volume split are sized separately for now.
French Drain Calculator
French drain trench excavation volume.
This French drain trench requires excavating — cu yd.
Length source
Use the length from the active project's Trench Volume run, or override manually.
Chained trench length
Run Trench Volume first to prefill this drain's length.
French drain trench inputs
Estimates total trench volume only -- pipe and gravel-aggregate quantities are sized separately.
This French drain trench requires excavating — cu yd.
Excavate
French drain trench estimate
Warnings
- ERROR Enter a length greater than zero.
- ERROR Enter a width greater than zero.
- ERROR Enter a depth greater than zero.
- INFO This estimates total trench volume only. It does not split out perforated pipe vs. gravel aggregate quantities -- size those separately for your pipe diameter and gravel backfill fraction.
Detail values
Assumptions
- Scope: Total trench volume only, no pipe/aggregate split
Included: trench volume.
Not included: labor, delivery, permits, disposal, compaction (enter your intended post-compaction depth/volume — this estimate does not account for compaction itself).
Formula details
- Trench volume: length x width x depth
- Cubic yards: cubicFeet / 27
Material List
About this calculator
Enter trench length, width, and depth to estimate total excavation volume.