Septic Tank Size Calculator

Calculate the perfect septic tank size for your home based on household needs and usage patterns

Input Parameters

Basic Information

Number of Bedrooms 3

1 8

Number of Bathrooms 2

1 6

Household Occupants 4

1 12

Region

Regional factors may affect sizing requirements

Additional Factors

Water Usage Level

Low (75 gal/person/day) - Water-efficient fixtures Medium (100 gal/person/day) - Standard usage High (125 gal/person/day) - Above average usage

Appliances & Fixtures

Garbage Disposal (+50 gal/day) Dishwasher (+30 gal/day) Washing Machine (+50 gal/day)

Recommended Tank Size

1500

gallons

Minimum Size

1250

gallons

Daily Usage

480

gal/day

Retention Time

3.1

days

Adequate Capacity

Based on your inputs:

• 3 bedroom(s), 2 bathroom(s)
• 4 occupant(s)
• medium water usage level
• Region: general

⚠️ Always consult with a licensed professional for final sizing and installation

Tank Size Comparison by Bedrooms

Minimum tank sizes for different home configurations (based on your usage factors)

💡 Pro Tip

Consider choosing a size 25-30% larger than minimum for optimal performance and future needs.

✓ Best Practice

Larger tanks require less frequent pumping and handle peak usage better.