Know if a rental cash-flows in 3 seconds.
Open any listing on Zillow, Redfin or Realtor.com. Rentmark Deal Analyzer shows the cash flow, cap rate, cash-on-cash return and your max offer price — right next to the listing.
Free to use · Pro $29.99/mo for automatic rent estimates & synced deals · Cancel anytime
Not affiliated with or endorsed by Zillow, Redfin or Realtor.com.
A spreadsheet takes 20 minutes per listing. Good deals don't wait that long.
Open a listing
Browse Zillow, Redfin or Realtor.com exactly like you do today.
Click the Rentmark icon
The side panel opens next to the listing, already filled in.
Read the verdict
Cash flow, returns and your max offer. Change any assumption and watch it update.
Open a listing. Get the verdict.
- ✓Price, taxes, HOA, beds, baths and square footage read straight from the listing
- ✓Cash flow, cash-on-cash, cap rate and DSCR calculated instantly
- ✓A clear verdict against the targets you set — and how reliable each number is
Your rules, not ours — change any number, see it live
- ✓Down payment, rate, term, vacancy, repairs, capex, management and closing costs
- ✓Sensible defaults for a US rental, remembered for next time
- ✓Every figure shows where it comes from: the listing, an estimate or you
Know your walk-away price before you call the agent
- ✓Set your target monthly cash flow or cash-on-cash return
- ✓Rentmark works backward to the highest price that still hits it
- ✓See the break-even rent, rate and price — what makes this deal stop working
The costs a listing page never shows you
- ✓Landlord insurance estimated from your state's real premiums — not a flat percentage
- ✓The tax an investor pays, flagged where a sale resets it (California, Florida, Texas, Michigan)
- ✓Vacancy, repairs, CapEx by year built and management — the costs that turn a good deal bad
A lender-ready report in one click
- ✓One page with the property, every number and your assumptions
- ✓Send it to your lender, your business partner or your spouse
- ✓Clean and professional — no spreadsheet screenshots
Every deal you've looked at, in one list
- ✓Save a listing in one click, right from the side panel
- ✓Track each deal: analyzing, offer made, under contract, bought
- ✓Sign in and find every deal in your online dashboard, on any computer
Deal Analyzer in 60 seconds
Watch a real listing go from browsing to a clear verdict and a max offer price — filmed in the extension.
Every number an investor checks
Cash flow
Rent minus every expense and the mortgage — monthly and yearly.
Cash-on-cash return
Yearly cash flow divided by the cash you actually put in.
Cap rate
Net operating income divided by the price — the deal without financing.
DSCR
NOI divided by the mortgage payment — what DSCR lenders look at first.
1% rule
Monthly rent divided by the price — the classic five-second screen.
Cash to close
Down payment, closing costs and upfront repairs, added up.
NOI
Rent minus operating expenses, before the mortgage.
Max offer price
The highest price that still hits your cash-flow target.
Break-even rent & rate
The rent and the interest rate at which this deal stops working.
Reads only the listing you're on
Nothing runs on other websites, nothing tracks your browsing, and listing photos and descriptions are never stored.
Every figure, with its source
The listing, a public average or your own number — and a reliability rating that tells you what to verify before you offer.
Your numbers, your call
The verdict measures a deal against the targets you set. It's a decision tool, not financial advice.
Start free. Go Pro when you're buying.
Every calculation is free, forever. Pro adds automatic rent estimates, synced deals and branded reports.
Everything you need to screen a listing in seconds.
- Works on Zillow, Redfin & Realtor.com listings
- All 8 numbers: cash flow, cash-on-cash, cap rate, DSCR…
- Your verdict against your own targets
- Max offer price calculator
- Today's 30-year mortgage rate, applied for you
- Rent estimate from the listing when it shows one
- Landlord insurance estimated from your state's premiums
- Break-even rent, rate and price
- A reliability rating on every analysis
- Manual entry for any property
- Save deals and export a PDF report
- Online dashboard for up to 5 saved deals
For investors who analyze listings every week.
- Everything in Free
- Automatic rent estimate on every listing, from local rental data
- Unlimited deals in your online dashboard, on every computer
- Branded, lender-ready PDF reports
- Priority email support
Pro is rolling out soon — every free feature works today · Cancel anytime
Frequently asked questions
Is Rentmark Deal Analyzer free?
Yes. Every calculation — cash flow, cash-on-cash, cap rate, DSCR, the 1% rule and your max offer price — is free, with no account needed. Deal Analyzer Pro ($29.99/month) adds unlimited deals in your online dashboard, automatic rent estimates from local rental data and branded reports.
Which listing sites does it work on?
Zillow, Redfin and Realtor.com property pages. Open a listing and the numbers are filled in for you. For any other property — an off-market deal, a wholesaler's email — you can type the details in by hand and get the same analysis.
Which browsers are supported?
Google Chrome on desktop, plus the browsers that install extensions from the Chrome Web Store: Microsoft Edge, Brave, Arc and other Chromium browsers. Browser extensions don't run on phones.
Where does the rent estimate come from?
When the listing shows a rent estimate — like Zillow's Rent Zestimate® — Deal Analyzer uses it and says so. Otherwise, enter the rent you expect. Pro will add property-level estimates from local rental data. Either way, the source is always shown and you can overwrite the rent with your own number.
Where do your numbers come from?
Price, beds, baths, square footage, taxes and HOA are read from the listing. The interest rate is Freddie Mac's weekly 30-year average plus an investor premium. Insurance is estimated from your state's average premium, adjusted for a landlord policy. Vacancy uses the Census rental vacancy rate; repairs, CapEx and management follow standard investor ratios, with CapEx set by the year the house was built. Every line in the panel says which of these it used, and you can overwrite any of them.
How is the mortgage rate chosen?
We start from Freddie Mac's weekly 30-year fixed average and add an investor premium, because loans on rentals cost more than loans on a home you live in — about 0.5 point at 25% down, up to 1.5 points below 20%. The premium follows your down payment, and you can override the rate at any time.
What does the extension read on my browser?
Only the listing page you have open, and only on Zillow, Redfin and Realtor.com. It doesn't read other sites, doesn't track your browsing history and never stores the listing's photos or description. If you sign in, only the deals you choose to save are sent to your dashboard.
Do I need an account?
No — the extension works without one. Create a free Deal Analyzer account when you want your saved deals in an online dashboard: every deal you save from the side panel shows up there, with its numbers, its status and a link back to the listing, on any computer.
Is the verdict financial advice?
No. Deal Analyzer shows estimates based on the listing and on assumptions you control, and tells you whether a deal meets the targets you set. Always verify taxes, insurance, rents and financing before making an offer.
Do I need a Rentmark property management account?
No. Deal Analyzer is its own product with its own plan. Rentmark also makes property management software for landlords, but you don't need it — or pay for it — to use Deal Analyzer.
Can I cancel Pro anytime?
Yes. Cancel in one click from your account — no commitment, no cancellation fee. You keep the free version and its calculations.
Another question? Write to Rentmark support.
Stop guessing. Know the numbers before you make an offer.
Free on every listing, no account needed. Go Pro for $29.99/month when you're actively buying.
Chrome, Edge & Brave on desktop · Estimates, not financial advice