Rental Property ROI Calculator
Note: This post is a little different from our usual dog-related content.
We built this simple calculator to help us quickly estimate rental property returns.
It's mainly for our personal use, but we're sharing it here in case it might be useful for someone else.
Enter Your Property Inputs
How This Calculator Works
We estimate monthly cash flow = rent minus mortgage plus operating expenses, then annualize it to show
cash-on-cash ROI using your down payment as invested cash.
Mortgage is calculated with the standard amortization formula from loan principal, rate, and term. Operating
expenses include tax, insurance, HOA, vacancy, repairs, and management.
Last reviewed by the Dogality Test Team on Sep. 30, 2025.