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Free Septic System Calculators

Three tools that answer the questions homeowners ask before calling a contractor — sizing, cost, and lifespan. Free, no account required.

Septic Tools

Pick your calculator

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Sizing Tool
Septic Tank Size Calculator
Enter bedroom count, household size, and water use to get the minimum required and recommended tank size — based on EPA guidelines and standard state code requirements.
EPA-based sizing tables Heavy vs. standard water use Daily design flow output
Use the calculator →
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Cost Estimator
Septic Tank Pumping Cost Estimator
Get a realistic cost range for a pump-out based on tank size, region, and access difficulty — before you call a contractor. Includes urgency guidance if you're overdue.
Regional pricing factors Access difficulty adjustment Overdue urgency indicator
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Lifespan Tool
Septic System Lifespan Estimator
Estimate how many years your septic system has left based on tank material, maintenance history, and household load — with a risk tier and recommended next steps.
4 tank materials covered Maintenance history factored Risk tier output
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Free Download
The Septic System Maintenance Guide
9-page PDF — maintenance schedule, warning signs, pump-out timing, and what to ask a contractor before signing anything.
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