Drainage trench gravel calculator
Measure your project. Make a clearer plan.
Estimate gravel fill around one pipe in a rectangular drainage trench.
Clear math. Better decisions.
A worked example
A 40 ft trench, 12 inches wide and 18 inches gravel-filled depth, with a 4 inch pipe holds about 2.09 cu yd before extra.
Before you order
- Estimate gravel fill around one pipe in a rectangular drainage trench.
- Uses the outside pipe diameter and assumes the pipe fits wholly within the gravel layer. Slope, outfall, pipe sizing, and drainage design are separate decisions.
Good questions.
Where do the prices come from?
You enter actual supplier prices. A blank price is unknown; enter zero only when that item is free or deliberately excluded. Taxes and installation are excluded unless a field explicitly includes them.
Can I use metric measurements?
Yes. The unit selector converts dimensions and unit prices. Results use whole packages where applicable. Starting dimensions are examples; confirm product specifications before ordering.
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