A cap rate in real estate is a property’s net operating income divided by its current market value or purchase price, shown as a percentage. It tells you the return a property would generate in one year if it were bought entirely in cash, before any mortgage payment enters the picture. Appraisers, lenders, and investors reach for it first because it turns properties of very different sizes and prices into one comparable number.
The Cap Rate Formula Explained
The formula behind a cap rate is short: net operating income divided by property value. Net operating income, or NOI, is what a property earns after operating expenses such as property taxes, insurance, repairs, and management fees, but before mortgage payments, income taxes, or major capital projects.
The same formula rearranges into two other tools investors use often. To estimate what a property is worth, divide NOI by the market cap rate for similar properties. To check whether an asking price is realistic, multiply the price by the market cap rate and compare that figure against the property’s actual NOI.
This makes a cap rate closer to a snapshot than a forecast. It measures what a property earns today, not what it might earn after a renovation, a rent increase, or a few years of appreciation.
How to Calculate a Cap Rate: A Step-by-Step Example
Take a fourplex listed at $950,000. The four units bring in $84,000 a year in combined rent, and operating costs, including property taxes, insurance, routine maintenance, management fees, and a vacancy reserve, add up to $27,600 a year.
Net operating income comes to $84,000 minus $27,600, or $56,400. Divide that by the $950,000 price and the cap rate works out to 5.9 percent.
That single number lets an investor line this fourplex up against a completely different property, say a small retail strip a few miles away, without getting lost comparing square footage, unit counts, or rent rolls. If similar four-unit buildings nearby are trading around a 6 percent cap rate, the $56,400 NOI implies a value near $940,000, which sits close enough to the $950,000 asking price to suggest the seller isn’t pricing far outside the market
What Counts as a Good Cap Rate Right Now
Cap rate on its own does not say whether a deal is good. It says how the market is pricing that property’s risk and income relative to its price, and that pricing shifts with the broader economy.
Cap Rate Ranges by Risk Level
Well leased, well located properties generally trade in the 4 to 6 percent range, reflecting steadier income and lower perceived risk. Properties carrying more risk, whether from an older building, a softer submarket, or shorter lease terms, often trade at 7 to 10 percent or higher, since buyers expect to be paid more for taking on that uncertainty.
Current market conditions add useful context here. By late 2025, the gap between average commercial cap rates and 10-year Treasury yields had narrowed to roughly 172 basis points, well below the 342 basis point average that held from 1991 through 2019, according to research from CBRE Investment Management. A narrower spread means buyers are paying more for each dollar of income relative to what a safer bond pays, which puts more weight on careful underwriting and less on the cap rate by itself.
CBRE’s 2026 outlook expects cap rates across most property types to tighten another 5 to 15 basis points as pricing stabilizes and transaction activity picks back up. A rate that looks generous compared to a few years ago may simply reflect where the broader market has settled, not a bargain.
Why Investors Rely on Cap Rate
Cap rate earns its place as the first metric most investors check because it strips financing out of the equation. Two buyers with completely different loan terms or down payments can look at the same property and land on the same cap rate, since it depends only on income and price.
Appraisers use it too, through what’s called the direct capitalization method: take a property’s stabilized NOI, divide it by a market-derived cap rate, and the result is an estimate of value. This is one of the main ways commercial properties get valued, alongside the sales comparison and cost approaches.
For an investor scanning several listings in one submarket, cap rate works like a sorting tool. A property priced well below the going cap rate for its area is worth a closer look, and one priced well above it usually needs a good explanation.
The same logic scales up. A fund or a lender reviewing dozens of properties across several metro areas can rank them by cap rate as a first pass, then narrow the list down before spending time on lease files, inspection reports, or a site visit. It won’t replace that deeper due diligence, but it keeps the early screening fast.
Cap Rate vs Cash-on-Cash Return, IRR, and ROI
Cap rate answers one question: what does a property earn relative to its price, assuming an all-cash purchase? Once financing, holding period, and future cash flows enter the picture, other metrics take over.
| Metric | What It Measures | Accounts for Financing |
| Cap Rate | Income relative to price, one year, unlevered | No |
| Cash-on-Cash Return | Annual pre-tax cash flow relative to actual cash invested | Yes |
| Internal Rate of Return (IRR) | Annualized return across the full holding period, including resale | Yes |
| Return on Investment (ROI) | Total profit relative to total investment over any period | Yes |
A property with an 8 percent cap rate can produce a much higher, or much lower, cash-on-cash return once a mortgage enters the picture, since leverage magnifies both gains and losses. That’s the main reason cap rate works well for comparing properties and falls short as the only number behind a purchase decision.
What Cap Rate Does Not Measure
Cap rate leaves out several things that matter to an actual return. It does not include mortgage payments, so two identical properties can produce very different cash flow once one is financed and the other is bought outright.
It also treats income as fixed for that one year, so it won’t show what happens after a lease renews at a higher rent, after a value-add renovation, or after a resale years down the line. Capital expenditures like a new roof or major system replacement sit outside NOI, and outside the cap rate, entirely.
Because of these gaps, cap rate works best as a starting filter, not a final answer. Reviewing a full pro forma, checking local rent trends, and, for larger purchases, getting guidance from a real estate attorney, CPA, or licensed broker will fill in what the cap rate leaves out
What Moves Cap Rates Up or Down
Interest rates set the floor. When borrowing costs rise, buyers generally demand a higher return to offset the higher cost of debt, which pushes cap rates up and property values down for the same NOI. When rates fall, that relationship tends to work in reverse.
Location and property class matter just as much. A newer building in a market with strong job growth and low vacancy usually trades at a lower cap rate than an older property in a slower market, since buyers accept a lower return for lower perceived risk.
Tenant quality plays a part too. A single-tenant retail building leased to a national credit tenant on a long-term lease will typically trade at a tighter cap rate than a similar building leased to several smaller, shorter-term tenants, since that income is viewed as more dependable.
Vacancy and lease rollover add another layer. A building with several leases expiring in the next year or two carries more uncertainty about what NOI will look like once those tenants renew, downsize, or leave, and buyers usually price that uncertainty into a higher cap rate. Supply and demand in the local investment market round things out: when more buyers are chasing the same pool of listings, cap rates tend to compress, and when buyers pull back, they tend to widen.
Where to Find Reliable Cap Rate Data
Cap rate benchmarks come from a handful of consistent sources. Commercial brokers and appraisers pull comparable sales through paid platforms and public deed records, while quarterly surveys from firms such as CBRE publish average cap rates by property type and metro area.
For a single property, the most reliable number usually comes from a local commercial broker who tracks recent closed sales in that specific submarket, since national averages can miss local swings in supply, demand, and buyer interest.
Put together, a cap rate gives a quick read on how the market is pricing a property’s income today. Pair it with NOI details, financing terms, and a look at where rates and demand are headed, and it becomes one solid piece of a much fuller investment picture.
