TL;DR
- Cap rate is calculated as Net Operating Income divided by purchase price, expressed as a percentage, on an unleveraged, all-cash basis. - The formula deliberately excludes mortgage payments, making it a way to compare properties or markets independent of how any specific buyer finances a deal. - A property generating $22,120 in NOI on a $350,000 purchase price works out to a cap rate near 6.3%, a figure that sits within the commonly cited 5-10% range for many markets. - Dividing a target NOI by a target cap rate produces the maximum purchase price consistent with that return, a calculation frequently used to screen deals before financing terms are known. - Cap rate says nothing about leveraged, after-financing returns; metrics like cash-on-cash return and debt service coverage ratio (DSCR) are used to model that separately.
Capitalization rate, almost universally shortened to cap rate, is one of the first numbers real estate investors and appraisers reach for when sizing up an income-producing property. It compresses a property's rent roll, vacancy assumption, and operating expenses into a single percentage that can be compared across markets, property types, and price points without any reference to how a specific buyer plans to finance the purchase.
Informational calculation reference only. All equations, tools, and outputs on this page are intended strictly for educational modeling and mathematical illustration. They do not constitute certified financial, legal, or tax advice. For specific scenarios, consult a certified public accountant (CPA) or a fiduciary financial advisor.
Why This Metric Dictates Profitability
Cap rate matters because it isolates the operating performance of a property from the financing decisions layered on top of it. Two investors buying the identical duplex at the identical price, one with an all-cash purchase and one with an 80% loan-to-value mortgage, will experience very different cash-on-cash returns. Their cap rate, however, is identical, because cap rate is calculated before any mortgage principal or interest enters the picture.
That property-level, financing-independent view is what makes cap rate useful for screening deals quickly and for comparing markets against one another. A cap rate of 4% in a coastal metro and a cap rate of 9% in a secondary market are not simply "better" or "worse" in isolation; the gap typically reflects a market's assumed appreciation potential, rent growth trajectory, and perceived risk. Depending on an investor's income needs versus appreciation expectations, either end of that range can align with a given strategy.
Because cap rate strips out debt service, it also tends to compress and expand with prevailing interest rates and buyer competition. When borrowing costs rise, cap rates in a given market often drift upward too, since buyers require a higher unleveraged yield to offset the higher cost of the debt they would otherwise use. When many buyers compete for a limited pool of listings, cap rates in that market can compress even as borrowing costs stay flat, since bidding activity pushes purchase prices up faster than rents.
Appraisers rely on the same mechanics through what is known as the income approach to valuation: a property's estimated value is modeled by dividing its NOI by a market-derived cap rate pulled from comparable recent sales. This makes cap rate a two-way tool. It can be calculated from a known price to assess a deal, or it can be used in reverse, alongside a market cap rate assumption, to estimate what a property might be worth based purely on its income stream.
Equation and Data Inputs
The calculation happens in two steps. First, Net Operating Income (NOI) is derived from gross rent, a vacancy allowance, and operating expenses:
NOI = \left( \text{Gross Rent} \times (1 - \text{Vacancy Rate}) \right) - \text{Operating Expenses}
Operating expenses in this formula cover property taxes, insurance, HOA dues, routine maintenance, and property management fees. Mortgage principal, interest, and depreciation are excluded by convention, since cap rate is meant to represent the property's performance independent of financing structure.
Second, cap rate itself is NOI expressed as a percentage of purchase price:
\text{Cap Rate} = \frac{NOI}{\text{Purchase Price}} \times 100
Consider a $350,000 property renting for $2,800 per month, or $33,600 in gross annual rent. Applying a 5% vacancy allowance reduces effective gross income to roughly $31,920. Subtracting $9,800 in combined taxes, insurance, maintenance, and management brings NOI to approximately $22,120. Divided by the $350,000 purchase price, that works out to a cap rate near 6.3%.
The same formula runs in reverse to answer a different question: what is the maximum price to pay for a given target return? Rearranging for purchase price gives:
\text{Max Purchase Price} = \frac{NOI}{\text{Target Cap Rate}}
Using the $22,120 NOI figure from the example above against a 7% target cap rate implies a maximum purchase price of roughly $316,000 — below the $350,000 asking price, which would indicate the property does not clear that particular return threshold at the quoted terms.
Benchmark Ranges
Cap rate benchmarks vary considerably by market type and property class, and the ranges below are illustrative reference points rather than universal thresholds.
| Market or property profile | Typical cap rate range | General interpretation |
|---|---|---|
| Prime coastal/urban metro, Class A | 3% – 5% | Lower yield, often priced for appreciation potential |
| Established suburban market, Class B | 5% – 7% | Balanced yield-to-risk profile in many analyses |
| Secondary/tertiary market, Class B/C | 7% – 10% | Higher stated yield, often reflecting elevated risk or slower appreciation assumptions |
| Distressed or high-risk asset | 10%+ | Elevated yield frequently paired with vacancy, deferred maintenance, or tenant-quality risk |
A cap rate calculated from a seller's marketing materials also deserves scrutiny before it is compared against these benchmarks. Sellers occasionally present a "pro forma" NOI that assumes rents raised to market level or expenses trimmed below what the current operating history supports. Rebuilding NOI from actual trailing income and expenses, rather than a projected figure, generally produces a more reliable cap rate for underwriting purposes.
Disclaimer: While we strive for absolute mathematical precision, actual real-world financial outcomes may vary based on institutional fees, localized tax brackets, changes in federal legislation, or fluctuating market indexes.