Rentmark Deal Analyzer — Rental Property Calculator

Analyze Zillow, Redfin & Realtor.com listings in seconds: cash flow, cap rate, cash-on-cash, DSCR and your max offer price.

Know if a rental property cash-flows — before you make an offer. Open any home listing on Zillow, Redfin or Realtor.com and click the Rentmark icon. A side panel opens next to the listing, already filled in, with everything a real estate investor checks: • Monthly and yearly cash flow • Cash-on-cash return • Cap rate and NOI • DSCR (debt service coverage ratio) • The 1% rule • Cash needed to close • Your max offer price — the highest price that still hits your targets A CLEAR VERDICT, AGAINST YOUR OWN TARGETS Set the monthly cash flow and cash-on-cash return you want. Every listing gets a green, orange or red verdict measured against them, and Rentmark works backward to your walk-away price. EVERY NUMBER, WITH ITS SOURCE Price, taxes, HOA, beds, baths, square footage and the listing's own rent estimate (like Zillow's Rent Zestimate®) are read from the page. Today's 30-year mortgage rate comes from Freddie Mac's weekly survey, plus an investor premium. When a figure isn't on the listing, you see a clearly labeled estimate. Change any number — down payment, rate, vacancy, repairs, CapEx, management, rehab — and the analysis updates instantly. SAVE DEALS AND EXPORT A PDF Save the listings worth a second look and track each one: analyzing, offer made, under contract, bought or passed. Export a clean one-page PDF report for your lender, your partner or your spouse. WORKS ON ANY PROPERTY Off-market deal, wholesaler email, FSBO? Enter the property by hand and get the same analysis. YOUR DEALS, IN ONE DASHBOARD Create a free Deal Analyzer account and every deal you save shows up at rentmark.io/analyzer — with its numbers, its status, your notes and a link back to the listing, on any computer. PRIVATE BY DESIGN The extension reads only the listing you have open, and only on Zillow, Redfin and Realtor.com. The analysis runs inside your browser: listing content is never sent anywhere, and your deals and settings stay on your computer. No tracking, no ads, no account needed. Made by Rentmark (rentmark.io). Estimates, not financial advice — always verify taxes, insurance, rent and financing before making an offer. Not affiliated with or endorsed by Zillow, Redfin or Realtor.com. Rent Zestimate is a registered trademark of Zillow, Inc.