The Real Estate Investment Calculator is a free online tool that helps real estate investors evaluate rental property deals before purchasing. It calculates Cash on Cash Return (ROI), Capitalization Rate (Cap Rate), Net Operating Income (NOI), and monthly cash flow by analyzing purchase price, financing terms, rental income, and operating expenses.
This guide walks through the 4-step process of analyzing any rental property investment, explains what each metric means, and provides tips for accurate underwriting. No signup or download required — start analyzing a property now.
Getting Started
1. Enter Purchase Details
Start by entering the property's purchase price, closing costs, and any repair costs you anticipate. These values form the foundation of your investment analysis.
2. Configure Financing
Set your down payment percentage, interest rate, and loan term. Use the Mortgage Calculator button for a detailed amortization breakdown.
3. Add Income & Expenses
Enter the expected monthly rent, vacancy rate, property taxes, insurance, HOA fees, and maintenance costs. Be conservative with your estimates for accurate results.
4. Analyze Results
Click "Run Analysis" to see your ROI, Cap Rate, Cash Flow, and detailed projections. Save properties to compare multiple deals.
Key Metrics Explained
Cap Rate
Capitalization Rate measures the property's return without financing.
A higher cap rate indicates higher potential returns but may also indicate higher risk.
Cash on Cash ROI
Measures return on your actual cash invested.
This is the most relevant metric for leveraged investments.
Net Operating Income (NOI)
Total income minus operating expenses (before mortgage).
NOI excludes mortgage payments and capital expenditures.
Monthly Cash Flow
Money left over after all expenses including mortgage.
Aim for positive cash flow to ensure the property pays for itself.
Pro Tips
- 1 Be Conservative: Use realistic vacancy rates (5-10%) and maintenance costs (5-10% of rent) to avoid surprises.
- 2 Compare Multiple Deals: Save properties to your portfolio and compare them side by side before deciding.
- 3 Include All Costs: Don't forget property management fees, HOA dues, and insurance in your expense calculations.
- 4 Use the Mortgage Calculator: Understand how different down payments and interest rates affect your returns.