🏢 Rental Property ROI (Cap Rate) Calculator
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How to Evaluate a Rental Property Like a Pro Investor
Professional real estate investors don’t guess—they use numbers. This calculator gives you the two most important metrics for evaluating any rental property: Cap Rate and Cash-on-Cash Return. Together, they tell you whether a property is likely to generate positive cash flow and how efficiently your invested capital is working.
How to Use This Calculator
- Property Price: The purchase price of the property.
- Down Payment: Cash you’re putting down upfront. A larger down payment lowers your mortgage but ties up more capital.
- Interest Rate & Loan Term: The financing terms you expect to secure. Shop around with multiple lenders for the best rates.
- Monthly Rent: Gross rental income. Research comparable properties in the area for realistic numbers.
- Annual Expenses: Property taxes, insurance, repairs, property management fees, HOA dues, and any other recurring costs. A good rule of thumb is to budget 1–2% of the property value annually for maintenance alone.
- Vacancy Rate: The percentage of time you expect the property to be unoccupied between tenants. 5–8% is conservative for most markets.
Cap Rate vs. Cash-on-Cash Return: What’s the Difference?
- Cap Rate (Capitalization Rate): Measures the property’s unlevered return—how much income it generates relative to its price, ignoring financing. Formula:
Cap Rate = NOI Ă· Property Price Ă— 100. Use this to compare properties apples-to-apples regardless of how you finance them. - Cash-on-Cash Return: Measures the levered return on your actual cash investment. Formula:
Cash-on-Cash = Annual Cash Flow Ă· Down Payment Ă— 100. This shows what your down payment is earning you in real cash flow each year.
📌 Real-World Example: A $250,000 property with $50,000 down, 6.5% interest, $2,000 monthly rent, and $5,000 annual expenses generates a 7.2% cap rate and about 12% cash-on-cash return. That means your $50,000 is earning roughly $6,200 in annual cash flow—far better than a savings account.
What Is a “Good” Cap Rate?
There’s no universal answer—it depends on the market and your goals:
- 4–6%: Common in expensive, high-demand cities. Lower risk, lower return.
- 7–10%: A balanced range for many suburban and mid-tier markets. Decent return without extreme risk.
- 10%+: Higher potential return, but often comes with higher risk—older properties, less desirable neighborhoods, or higher tenant turnover.
Always compare cap rates for similar properties in the same market. A high cap rate may signal a bargain—or a money pit.
Frequently Asked Questions
Does this calculator include PMI?
No. If you’re putting down less than 20% on a conventional loan, you’ll likely pay Private Mortgage Insurance. Add PMI cost to your annual expenses input for accuracy.
What about property appreciation?
This calculator focuses on cash flow—the money you earn month-to-month. Appreciation (the property increasing in value over time) is a bonus, not a guarantee. Smart investors buy for cash flow first.
How do I estimate accurate expenses?
Ask the seller for actual expense records, check county tax assessor websites, and get insurance quotes before buying. For repairs, budget at least 1% of the property’s value per year.
Should I include property management fees?
If you plan to use a property manager, yes. Management typically costs 8–12% of monthly rent. Add this to your annual expenses.
Related Tools & Resources
- Mortgage Payment Calculator — See full PITI before you buy.
- Home Affordability Calculator — How much can you afford?
- Compound Interest Calculator — Grow your rental profits over time.
Disclaimer: This calculator provides estimates for educational purposes. It does not constitute investment advice. Always consult a financial advisor and perform thorough due diligence before purchasing real estate.