Home ROI Calculator Evaluate the profitability of a rental property by calculating the Capitalization Rate (Cap Rate) and estimated monthly cash flow. Purchase & Financing Purchase Price ($) Down Payment (%) Mortgage Interest Rate (%) Loan Term (Years) Income & Expenses Gross Monthly Rent ($) Annual Operating Expenses ($) Property taxes, insurance, HOA, maintenance. (Do NOT include mortgage). Calculate ROI & Cash Flow Property Analysis Summary Monthly Cash Flow $0 Cap Rate 0% Net Operating Income (NOI / Annual) $0 Monthly Mortgage Payment (P&I) $0 Cash-on-Cash Return 0% Cap Rate: Indicates the natural rate of return on a property regardless of financing. Cash Flow: The actual money left in your pocket each month after paying expenses and the mortgage. Cash-on-Cash Return: Annual pre-tax cash flow divided by the total cash invested (down payment).