You copy numbers into a spreadsheet. Plug in formulas. Tweak the down payment. Wait. Tweak the rent. Wait. 30 minutes later, you finally know if it's worth pursuing.
Meanwhile, someone else already made an offer.
There's a faster way.
Drag to adjust price, down payment, rent, or expenses. Watch your cash flow and returns update instantly—no submit buttons, no loading screens. Test 10 scenarios in the time it takes to run one in a spreadsheet.
Compare “Asking Price” vs “My Offer” vs “Aggressive” in one view. See exactly how each scenario affects your returns. Make confident offers backed by real numbers.
Stop guessing. Tell us your target—“I want 10% cash-on-cash”—and we'll calculate the exact price you need to offer. Reverse-engineer any deal to fit your criteria.
Paste a Zillow URL. We pull the price, beds, baths, taxes, and rent estimate automatically. No more manual data entry.
Ask questions a calculator can't answer: “What repairs should I budget for a 1962 house?” or “Is this a good BRRRR candidate?” Get real advice, not just numbers.
Send an interactive link to your lender or partner. They can adjust the sliders themselves and stress-test the deal. No login required.
I'm Tracy—a software developer by day and real estate investor on the side. Every time I found a property, I'd say “let me run the numbers” and then spend 30 minutes fighting a spreadsheet.
So I built RunTheNumbers: paste a link, drag some sliders, and know if a deal works in seconds—not hours.
It's bootstrapped, independent, and built to help you move faster than the competition.
— Tracy Brown Jr.
Paste your first Zillow link and know if it's a deal in 30 seconds.
Get Started Free →No credit card required