Rental Property Cash Flow & ROI Calculator
Understanding Rental Property ROI Metrics
Investing in real estate is a numbers game. To succeed, you must move beyond emotional decisions and rely on concrete financial metrics. This Rental Property Cash Flow Calculator helps you evaluate two of the most critical indicators of a property's success: Cash on Cash Return and Cap Rate.
1. Cash Flow
Cash flow is the profit you bring in each month after all expenses are paid. It is calculated as:
Monthly Rent – (Mortgage Payment + Taxes + Insurance + Maintenance + HOA)
Positive cash flow ensures your property is an asset, not a liability. In our calculator, we combine the mortgage principal and interest with your manually entered operating expenses to determine your net monthly cash position.
2. Cash on Cash ROI
While cash flow tells you the dollar amount you earn, Cash on Cash Return (CoC ROI) tells you how hard your money is working. It measures the annual cash flow relative to the total capital you invested (your down payment and closing costs).
Formula: (Annual Cash Flow / Total Cash Invested) × 100
For example, if you invest $50,000 as a down payment and the property generates $5,000 in profit per year, your Cash on Cash ROI is 10%. This allows you to compare real estate returns directly against stocks or bonds.
3. Cap Rate (Capitalization Rate)
The Cap Rate measures the natural rate of return of the property assuming you bought it with all cash. It is calculated by dividing the Net Operating Income (NOI) by the Purchase Price.
Formula: (Net Operating Income / Purchase Price) × 100
Cap rate helps you compare the profitability of similar properties regardless of how they are financed. A higher cap rate generally indicates a better return, though often accompanied by higher risk.
Real-World Example
Let's say you purchase a property for $200,000 with a 20% down payment ($40,000). You secure a 30-year loan at 6% interest. You rent the property for $1,800/month, and your taxes, insurance, and maintenance cost $500/month.
- Mortgage Payment: ~$959/month
- Total Expenses: $1,459/month
- Monthly Cash Flow: $1,800 – $1,459 = $341
- Annual Cash Flow: $4,092
- Cash on Cash ROI: ($4,092 / $40,000) = 10.23%
Using this calculator allows you to stress-test your deal before making an offer. Try adjusting the rent or interest rate to see how sensitive your returns are to market changes.