Septic Tank Capacity Tool

Our septic tank capacity calculator helps determine the minimum tank size required for your home based on number of bedrooms, occupants, and water usage. An undersized tank leads to frequent pumping, system failure, and potential health hazards from untreated sewage.

The calculator follows building code requirements (IRC/IPC) that specify minimum tank sizes based on bedroom count, then adjusts for actual household water usage. It also accounts for garbage disposals, which significantly increase solid waste and require larger tanks.

This tool is essential for homeowners installing new septic systems, replacing failed tanks, or adding bedrooms to their home. If you're asking "what size septic tank do I need?" or "how big is my drainfield?", this calculator provides code-compliant guidance for your project planning.