Compare calculators
Both calculators run independently β change the inputs on either side to compare results.
Plumbing
Septic Tank Size Calculator
Estimates the minimum septic tank capacity needed for a household based on bedroom count and daily water usage. Use it when planning a new septic installation or verifying compliance with local health codes.
Fill in the required fields to see your result.
Plumbing
Septic Tank Sizing Calculator
Estimates the minimum septic tank volume (in gallons) needed for a home based on bedroom count, occupants, plumbing fixtures, and daily wastewater generation. Use it when designing or permitting a new septic system.
Fill in the required fields to see your result.
Key differences
| Septic Tank Size Calculator | Septic Tank Sizing Calculator | |
|---|---|---|
| Category | Plumbing | Plumbing |
| Inputs required | 2 | 4 |
| Result | Required Tank Size (gallons) | Minimum Tank Size (gallons) |
| What it does | Estimates the minimum septic tank capacity needed for a household based on bedroom count and daily water usage. Use it when planning a new septic installation or verifying compliance with local health codes. | Estimates the minimum septic tank volume (in gallons) needed for a home based on bedroom count, occupants, plumbing fixtures, and daily wastewater generation. Use it when designing or permitting a new septic system. |