How to Calculate Cap Rate for Real Estate
Cap rate is the single most important metric for evaluating rental and commercial investment properties. It tells you the rate of return you would earn if you bought the property with all cash, making it the universal comparison tool across different properties, markets, and price points. Whether you are evaluating a potential acquisition, pricing a deal for your buyer list, or building a marketing package, understanding cap rate is essential.
The cap rate formula
Cap Rate = Net Operating Income (NOI) / Property Value
NOI is annual gross income minus operating expenses (but NOT mortgage payments). Property value is the purchase price or current market value. The result is expressed as a percentage. A property generating $16,000 NOI purchased for $200,000 has an 8% cap rate.
Calculating NOI step by step
Net Operating Income is the foundation of cap rate. Get this wrong and everything else is off. Here is how to calculate it:
NOI = Gross Rental Income - Vacancy Loss - Operating Expenses
Operating expenses include property taxes, insurance, maintenance, property management fees (typically 8-10% of rent), and reserves for capital expenditures. They do NOT include mortgage payments, depreciation, or income taxes. Those are investor-specific costs, not property-specific costs, which is exactly why cap rate is useful — it normalizes the comparison across investors with different financing structures.
For a detailed rental analysis walkthrough, see our rental property analysis guide.
What is a good cap rate?
| Cap Rate Range | Property Type | Risk Level |
|---|---|---|
| 3-5% | A-class properties in prime locations | Low risk, low return |
| 5-7% | B-class properties in solid neighborhoods | Moderate risk, moderate return |
| 7-10% | C-class properties, value-add opportunities | Higher risk, higher return |
| 10%+ | D-class or distressed properties | Highest risk |
There is no universally "good" cap rate. A 6% cap in San Francisco is excellent. A 6% cap in Detroit is mediocre. Cap rates reflect the market's assessment of risk and growth potential. Lower cap rates indicate lower risk and higher demand. Higher cap rates indicate higher risk or less desirable locations.
Using cap rate to compare properties
Cap rate normalizes the comparison between properties of different prices and income levels. A $200K property generating $16K NOI (8% cap) is producing a better unleveraged return than a $400K property generating $24K NOI (6% cap), even though the second property has higher absolute income. This makes cap rate the standard apples-to-apples comparison for rental investors.
Using cap rate to value properties
Property Value = NOI / Cap Rate
If you know the NOI ($30K) and the market cap rate for similar properties (7%), the property is worth approximately $428,571. This income approach to valuation is standard for commercial properties and multifamily with 5+ units. It is how institutional investors, appraisers, and lenders evaluate income-producing real estate.
Cap rate limitations
- Does not account for financing. Use cash-on-cash return for leveraged analysis.
- Does not account for appreciation potential. A low cap rate in a high-growth market may still be a great investment.
- Does not account for capital expenditures. Deferred maintenance can make a high cap rate deceptive — the property appears to yield more because critical repairs have been postponed.
- Varies by market. Always compare cap rates within the same market, not across markets.
- Snapshot in time. Cap rates shift with interest rates, rental market conditions, and local supply/demand.
Cap rate vs. cash-on-cash return
Cap rate assumes an all-cash purchase. Cash-on-cash return measures your return on actual cash invested (after leverage). A property with a 7% cap rate might produce a 12% cash-on-cash return with 75% leverage because your actual cash invested is only 25% of the purchase price. However, leverage also increases risk — if rents drop or expenses rise, your cash-on-cash can go negative while the cap rate remains positive.
Use cap rate to evaluate the property itself. Use cash-on-cash to evaluate the deal given your specific financing structure.
Common cap rate mistakes
- Using gross rent instead of NOI. This is the most common error. A property renting for $2,000/month is not generating $24,000 NOI — after vacancy, taxes, insurance, maintenance, and management, the NOI might be $14,000-$16,000.
- Comparing cap rates across markets. An 8% cap in Cleveland and an 8% cap in Austin represent very different risk profiles and growth potential.
- Ignoring deferred maintenance. A 10% cap rate on a property with a failing roof, old HVAC, and galvanized plumbing is not a bargain — it is a money pit masquerading as yield.
- Using projected rent instead of actual. If the property is currently vacant or renting below market, use current actual income for cap rate, and projected income for pro forma analysis only.
Presenting cap rate in deal packages
For wholesalers marketing to rental buyers, cap rate is the first number they look for. Include it prominently in your marketing package along with the NOI breakdown. Show your work: gross rent, vacancy assumption, itemized operating expenses, and resulting NOI. Buyers who trust your analysis respond faster, negotiate less, and close more reliably.