Rental Property Calculator

The Complete Guide to Analyzing Rental Properties

Investing in rental real estate can generate passive income, build long‑term wealth, and provide tax advantages. But not every property is a good deal. This Rental Property Calculator gives you a professional‑grade analysis of any potential investment. It calculates key metrics like cash flow, cap rate, cash‑on‑cash return, and total ROI—so you can quickly separate winners from losers.

Successful real estate investors focus on the numbers. They look at net operating income (NOI), financing costs, and total cash invested to determine if a property will generate positive monthly cash flow and meet their return thresholds. This calculator incorporates all major expense categories (taxes, insurance, maintenance, vacancy, property management) and uses realistic assumptions for appreciation and rent growth.

Understanding the Key Metrics

• Cap Rate (Capitalization Rate): NOI ÷ Purchase Price. Measures the property's unlevered return—ignoring financing. A higher cap rate generally indicates a better return, but also higher risk.
• Cash‑on‑Cash Return: Annual Pre‑Tax Cash Flow ÷ Total Cash Invested. This is the actual return on your out‑of‑pocket money, accounting for leverage.
• Monthly Cash Flow: Rental Income – All Expenses – Mortgage Payment. Positive cash flow is essential for long‑term sustainability.
• Total ROI: Combines cash flow, equity buildup from mortgage paydown, and appreciation. This is the true measure of wealth creation.

Expense Assumptions: Be Realistic

• Vacancy: Budget 5‑10% of rental income for turnover and vacant months.
• Maintenance & Repairs: 1% of property value annually is a safe estimate; older homes may require more.
• Property Management: Typically 8‑12% of monthly rent. Essential if you're not local or want a hands‑off investment.
• Capital Expenditures (CapEx): Big‑ticket items like roof, HVAC, and appliances. Some investors set aside 5‑10% of rent for future CapEx. This calculator lumps maintenance and CapEx together under "Maintenance."

Financing a Rental Property

Investment property loans typically require a larger down payment (20‑25%) and have slightly higher interest rates than primary residence loans. The calculator uses the interest rate and down payment you input to compute the monthly mortgage payment. Remember that leverage can boost cash‑on‑cash return, but it also increases risk if the property doesn't perform as expected.