Know if a rental pays before you call the agent.
DoorMeter puts cash flow, cash-on-cash return, cap rate and a deal score right on Zillow and Redfin listings, using local rents, property taxes and insurance. No spreadsheet, no copying numbers.
Free: 5 listings a month. Works in desktop Chrome on Zillow and Redfin (US listings).
- Cash flow
- +$412/mo
- Cash-on-cash
- 9.1%
- Cap rate
- 7.2%
- DSCR
- 1.38
- Rent (2 units) ESTIMATE$2,350
- Operating expenses−$1,012
- Mortgage (25% down, 6.75%)−$926
- Cash flow+$412
Rent: HUD Small Area fair market rent for the ZIP code. Tax: county rate × price.
How it works
1. Open a listing
DoorMeter reads the price, beds, HOA and the listing's own rent and tax figures from the page you're on.
2. It fills the gaps
Missing rent, tax or insurance comes from bundled U.S. government data (HUD fair market rents, Census tax rates, Treasury insurance data), and every number says where it came from.
3. Tweak and decide
Change the down payment, rate or rent and everything updates instantly. Save the deals worth a second look and compare them side by side.
Everything runs in your browser. DoorMeter doesn't send your listings, numbers or saved deals anywhere.
Pricing
Free
$0
- 5 listings analyzed per month
- Cash flow, cash-on-cash, cap rate, DSCR and a deal score
- Rule checks and where every number came from
- 3 saved deals and side-by-side compare
- One sample badge on search results
Pro monthly
$5/month
- Unlimited listings
- Badges on every search result
- Highest offer price, what-if and 30-year views
- Unlimited saved deals, CSV and PDF export
- Investor profiles, and price-drop alerts when a saved deal shows up again on Zillow or Redfin
Cancel anytime.
Pro lifetime
$49 once
- Everything in Pro, for as long as DoorMeter exists
- Updates included
- Use it on up to 2 browsers
14-day money-back guarantee.
Payments are handled by Polar (polar.sh), our merchant of record, which also handles sales tax and VAT. After you buy, you get a license key by email: paste it into the DoorMeter button in Chrome's toolbar. Pro works on up to 2 browsers per purchase.
FAQ
How accurate are the numbers?
They're estimates to help you screen deals fast. Rent comes from the listing when it has one, otherwise from HUD fair market rents, which run conservative. Taxes use county effective rates on the purchase price, and insurance uses 2022 owner-occupied premiums (landlord policies usually cost more). You can change any number. The guide explains where each estimate comes from.
Does DoorMeter collect my data?
Your deals, profiles and settings stay in your browser. Only two things ever leave it: your license key, checked with our payment provider, and broken-page reports you choose to send. See the privacy policy.
Which sites work?
Zillow and Redfin listing and search pages, in desktop Chrome.
Why do some search results show a grey badge?
Search results don't always include everything the math needs, such as a condo's HOA fee or a building's number of units. DoorMeter won't guess those: open the listing for the full analysis.
Is this financial advice?
No. DoorMeter is a calculator. Check the numbers with a lender, an insurer and local professionals before you buy.