Septic Tank Sizing Calculator
Estimate septic tank size from bedrooms and usage. Free, instant.
How to Use Septic Tank Sizing Calculator
1
Enter number of bedrooms.
2
Get minimum septic tank capacity.
3
Copy or download your result.
Frequently Asked Questions
What is the minimum septic tank size?
1,000 gallons minimum for most codes; 1,250 for 4 bedrooms.