Free calculator
Septic Drain Field Gravel
Estimate drain rock, perforated pipe, and filter fabric for a septic absorption field.
Results
Enter your dimensions and hit Calculate.
Drain field sizing is set by your local health department based on perc test results — this calculator estimates materials only, not system sizing.
Assumptions
- 10% added to filter fabric for overlap.
- Assumes a single-depth gravel bed below and around the pipe.