Septic Tank Calculator
Calculate the required septic tank size and drain field area based on bedrooms, occupants, and usage.
How to Use the Septic Tank Calculator
- Enter the number of bedrooms.
- Enter the number of occupants.
- Select the usage level.
- Click Calculate for tank size and drain field area.
Cas d'utilisation
- •Rural property septic system design.
- •Building permit requirements.
- •Replacement system sizing.
- •Environmental compliance planning.
Formule
Tank = max(bedrooms × 500, occupants × 200) L × usage factor. Drain field = occupants × 12–18 m².
Questions fréquemment posées
Why size by bedrooms?
Building codes often size septic systems by bedroom count as a proxy for maximum occupancy.
What is a drain field?
A drain field (leach field) is the area where treated effluent from the tank is absorbed into the soil.
How often should a septic tank be pumped?
Typically every 3–5 years, depending on tank size and household usage.