What Is a Cap Rate? Formula, Uses, and Limits

A cap rate, short for capitalization rate, is a property's annual net operating income divided by its price or value. It comes out as a percentage. Put simply, it tells you how much income a building throws off each year for every dollar you pay for it—before any loan enters the picture. That one number is the standard shorthand for pricing income-producing real estate.

# How a Cap Rate Works

The formula is one line:

Cap Rate = Net Operating Income ÷ Property Value

Net operating income, or NOI, is what's left of a property's revenue after you subtract the costs of running it—vacancy, taxes, insurance, management, maintenance, and any utilities the owner pays. It leaves out loan payments, big capital projects, depreciation, and income taxes.^[1] Those depend on how a buyer finances the deal and structures their taxes, not on how the building itself performs. Leaving them out is what lets two buyers with completely different loans compare the same property on equal terms.

In practice, the formula usually runs backward. Instead of calculating a cap rate, you start with one—pulled from recent sales of similar properties—and divide the property's NOI by it to get a value: Value = NOI ÷ Cap Rate. That method is called direct capitalization, and it sits behind most commercial appraisals and broker pricing opinions. The market sets the cap rate, not the analyst, which is why lenders require an appraisal to confirm the rate their underwriter assumed.^[2]

Another way to see it is that a cap rate is just an earnings multiple flipped upside down. A 5% cap rate is the same as paying 20 times the property's income.^[3] So high cap rates mean low prices, and low cap rates mean high ones.

Two versions come up constantly in underwriting. The going-in cap rate divides the first year's projected NOI by the purchase price—your entry yield. The exit cap rate (also called the terminal or reversion cap rate) is applied to NOI at the end of the hold to estimate what the property will sell for.^[4] The exit assumption is usually the most important number in a ten-year model.

# Why Cap Rates Matter

Small moves in the cap rate swing values hard. A property earning $1 million of NOI is worth $20 million at a 5.0% cap rate—and $18.2 million at 5.5%. A shift of half a percentage point, well within normal market drift, wipes out 9% of the value without the building changing at all.

That sensitivity is why exit cap assumptions get more scrutiny than any other line in a pro forma. For 2026, CBRE expects cap rates for most property types to tighten by 5 to 15 basis points, with returns coming mainly from income rather than rising prices.^[5]

# Common confusing things about Cap Rates

A cap rate is not a return. It's a snapshot of one year's income yield. It ignores debt, capital spending, when the cash actually arrives, sale costs, and whether the property gains or loses value. If you treat a 6% cap rate as a 6% return, you're skipping most of what decides the outcome.

An optimistic exit cap rate inflates everything downstream. ULI ranks it among the classic pro forma mistakes, next to lowballed costs and overestimated rents and warns that these errors stack. Combine three assumptions that are each only about 25% likely, and the scenario they describe has roughly a 1.5% chance of happening.^[6]

NOI is not standardized. Some markets and lenders count replacement reserves as an operating expense; others don't. Two deals both labeled "6% caps" can be built on different math. And cap rates only compare like to like—7% in a gateway market means something different than 7% in a small tertiary one.

# Related Terms

• IRR—the full-hold return that a cap rate doesn't measure
• Yield on Cost—the development-side version, using total project cost instead of price
• Development Pro Forma—where exit cap assumptions do their damage
• Residual Land Value—what a capped value implies you can afford to pay for the site
• Highest and Best Use—which income stream gets capitalized in the first place

# Frequently Asked Questions

# What is a good cap rate?

There's no universal answer. It depends on property type, market, asset quality, and how much risk you'll accept — a low cap rate signals a high price and low perceived risk, not a bad deal. Look at recent sales of similar properties in the same submarket, not a national average.

# Is a higher cap rate better?

Not by itself. A higher cap rate means more income per dollar of price, which usually means the market sees more risk: a weaker location, shorter leases, deferred repairs, or softer demand. Buyers chasing yield accept higher cap rates; buyers who want stability accept lower ones.

# What is the difference between cap rate and IRR?

A cap rate is a one-year, debt-free snapshot of income yield. IRR is the return over the entire hold, factoring in financing, capital spending, income growth, and the eventual sale. Cap rates price the asset; IRR measures what the investment actually earned.