Free Septic Sizing Calculator
Estimate tank size, drip field, and installed cost for a new Texas septic system in seconds — built on TCEQ 30 TAC Ch. 285.
A free sizing tool for realtors, builders & land buyers
Sizing a septic system shouldn't be a mystery when you're listing rural land, building on acreage, or helping a buyer budget. This free calculator turns a home's bedrooms and square footage into the tank size, drip-field range, and an installed-cost band — using the same Texas TCEQ 30 TAC Ch. 285 math our crews design to.
- Realtors listing rural or acreage property
- Home builders & developers
- Land buyers budgeting a new build
Try the calculator
Instant estimate
Septic System Sizing Calculator
Recommended tank
750 gal
Estimated drip field
750–1,500 linear ft
System type
Aerobic + drip
Estimated installed price
$12,000 – $14,000
Ballpark range for planning. Your exact price is set after a free site evaluation.
Estimate only — not a contract.
Add this calculator to your site — free
Copy the snippet below and paste it into any web page to embed the calculator. It's free to use, works on mobile, and links back to us for the full estimate.
<iframe src="https://quickflowseptic.com/embed/sizing-calculator" title="Septic System Sizing Calculator by Quick Flow Septic" width="100%" height="860" style="border:1px solid #e5e7eb;border-radius:12px;max-width:560px" loading="lazy"></iframe>Want a custom size or a co-branded version for your brokerage? Call us — we're happy to help.
Need a real number for a specific property?
Get a free, no-obligation on-site evaluation and a firm installed price for any lot in our service area.