Rental Property Calculator

Analyze rental property investments by calculating monthly cash flow, cap rate, cash-on-cash return, and ROI including all expenses.

Property Details

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Investment properties: 20-25%

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Income & Expenses

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Ready to Analyze

Enter property details and expenses to see your rental investment cash flow and returns.

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Pro Tip

The 1% rule is a quick screening tool: monthly rent should be at least 1% of the purchase price. A $300,000 property should rent for at least $3,000/month to be worth analyzing further.

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Analyzing Rental Property Investments

Rental property investment is one of the most popular paths to building wealth through real estate. Successful investing requires careful analysis of income potential, expenses, financing costs, and key return metrics before committing capital.

Cash flow is king in rental property investing. Positive monthly cash flow means the property pays for itself and generates income after all expenses including the mortgage. Even a small positive cash flow can be acceptable if the property has strong appreciation potential.

Two key metrics drive investment decisions: cap rate and cash-on-cash return. The cap rate (Net Operating Income / Purchase Price) measures the property's return independent of financing. Cash-on-cash return (Annual Cash Flow / Cash Invested) measures the return on your actual invested capital.

Do not overlook vacancy and maintenance costs. A property that looks profitable on paper can become a money pit if you underestimate these expenses. Conservative estimates upfront prevent unpleasant surprises and ensure your investment remains sustainable long-term.

Key Rental Property Formulas

Cap Rate & Cash-on-Cash Return

Cap Rate = NOI / Purchase Price
Cash-on-Cash = Annual Cash Flow / Total Cash Invested

Where:

NOI = Net Operating Income (annual rent - vacancy - expenses, before mortgage)

Annual Cash Flow = NOI minus annual mortgage payments

Total Cash Invested = Down payment + closing costs

Example

For a $300,000 property with $2,200/mo rent, 25% down at 7%:

  • • Monthly NOI: $2,200 - $110 vacancy - $426 expenses = $1,664
  • • Annual NOI: $19,968 | Cap Rate: $19,968 / $300,000 = 6.7%
  • • Mortgage: $1,497/mo | Monthly cash flow: $167
  • • Annual cash flow: $2,004
  • • Cash invested: $75,000 + $9,000 = $84,000 | Cash-on-Cash: 2.4%

Frequently Asked Questions

What is a good cap rate for rental property?
Cap rates vary by market and property type. Generally, 5-10% is considered good for residential rental properties. Higher cap rates indicate higher potential returns but may also signal higher risk. Markets with strong appreciation potential often have lower cap rates (3-5%).
What is cash-on-cash return?
Cash-on-cash return measures the annual pre-tax cash flow divided by the total cash invested (down payment + closing costs). A return of 8-12% is generally considered good. This metric is especially useful for leveraged investments as it measures the return on YOUR money, not the total property value.
How do I estimate vacancy rate?
Vacancy rate depends on your market and property type. A common estimate is 5-8% for stable markets with good demand. In less desirable areas or markets with high competition, use 8-12%. Check local rental statistics and talk to property managers for market-specific rates.
What expenses should I budget for maintenance?
Budget 8-12% of rent for maintenance and repairs. Older properties and properties with deferred maintenance need higher budgets. This covers routine repairs, appliance replacement, turnover costs, and general upkeep. Some investors use the 1% rule: budget 1% of property value annually.
Should I use a property manager?
Property management typically costs 8-12% of rent collected. It makes sense for investors who do not live near the property, own multiple properties, or prefer passive income. Self-management saves money but requires time and expertise in tenant screening, maintenance, and legal compliance.