Septic Tank Size Calculator

Get personalized septic tank and drainfield recommendations based on your state's code requirements. Enter your details below to get started.

Septic Tank Calculator

Get personalized recommendations based on your state's requirements

State *

Number of Bedrooms *

Special Fixtures (affect tank size)

Garbage Disposal

Water Softener

Hot Tub / Spa

Additional Kitchen (ADU)

Septic Calculator

Free septic tank sizing calculator covering all 50 US states. Get accurate recommendations based on your state's code requirements.

Tools

Tank Size Calculator Drainfield Calculator Cost Estimator Pump Schedule

Resources

State Requirements Septic Basics Maintenance Guide FAQ

Legal

Disclaimer: This calculator provides estimates only and should not be used as the sole basis for septic system design. Always consult with licensed septic professionals and local health department officials before installing or modifying a septic system. Local codes may have stricter requirements than state minimums.