Cap Rate Calculator

Cap rates, as Simon Jawitz wrote in Thesis Driven, “serve a real purpose but are often misunderstood and misused,” much as price/earnings ratios do in corporate finance. The division itself takes four seconds; almost every wrong cap rate is a wrong input rather than wrong arithmetic.

A stated NOI that quietly omits a management fee. An asking price treated as the all-in basis. A rate typed as 0.075 when 7.5 was meant, which is wrong by a factor of a hundred and looks perfectly plausible on the screen. The tool above is built to make those inputs visible instead of inherited, and to flag the third error rather than compute it.

Which direction to solve in

Three numbers, two of them always known, so there are three questions rather than one. Most tools answer only the first.

• The yield. An NOI and a price produce the cap rate. This is the comparison number, the one that travels between deals.
• The price. An NOI and a target rate produce the value that rate supports. A broker quotes an ask; this is what answers whether the ask is rich. It is the calculation people mean by a reverse cap rate calculator.
• The income. A price and a rate produce the NOI the price requires. Useful in the other direction: an offering memorandum quoting a 6 cap on a $12 million ask is claiming $720,000 of income, and the trailing statements either support that or they do not.

Where a real estate cap rate calculator gets its two numbers

Both inputs are softer than they look, and both are usually handed over by the party selling the building.

Net operating income appears twice in a deal package, in the offering memorandum and in the trailing twelve months of operating statements (the T12), and the two rarely agree. The OM figure is forward-looking; the T12 is what actually happened. The gap between them is the seller’s assumption about what the asset does next, and it belongs in the analysis rather than in the numerator. NOI itself runs after operating expenses and before debt service, capital expenditure, tenant improvements and depreciation.

Property value on an acquisition means the all-in basis, not the headline price. Closing costs, immediate capital needs and any assumption or defeasance costs belong in the denominator. A cap rate struck on the purchase price alone overstates the yield on the money actually committed, which is the flattering direction to be wrong in.

$410,000 divided by $6,000,000 is 6.83%. Run the same NOI at a 7.5% exit and the building supports $5,466,667, so $533,333 of value disappears with nothing changing at the property. That asymmetry is the reason the sensitivity table exists.

Checking the expense load

A stabilised asset typically runs operating expenses around 40% of effective gross income. That single ratio catches more bad NOI than any other check, which is why the builder above reports it back.

Fifty to sixty percent signals an asset that is not performing, or one carrying heavy payroll. Below about 25% usually means something is missing from the expense load rather than a building that is cheap to run, and the omission is most often management, insurance or reserves. For a multifamily cap rate calculation the load includes taxes on assessed value, insurance quoted per unit, a management fee struck as a percentage of effective gross revenue, and replacement reserves that lenders commonly require at 25 to 50 cents per square foot.

Reserves sit below the NOI line by convention, which is why two buildings with identical NOI are not identical if one has just had a roof and the other needs one. Entering a reserve figure gives the economic rather than the nominal number, a distinction the cap rate guide covers in full. Published operating-expense benchmarks come from Income/Expense IQ, compiled jointly by IREM, the National Apartment Association and BOMA from property-level data by asset type and market.

Why there is no mortgage field

The omission is deliberate: NOI is struck before any loan payment, so the same building returns the same rate bought all cash or at 65% leverage, and that is what makes two buildings comparable. Add financing and the number stops describing the asset and starts describing the buyer.

The metric that carries the loan and still rhymes with a cap rate is debt yield, which is NOI over loan amount rather than NOI over value. When debt yield equals the cap rate, the loan equals the property value and the deal is 100% levered, which is why lenders want debt yields comfortably above prevailing cap rates. For the levered view use debt service coverage ratio, debt yield, or cash-on-cash return.

What happens when the cap rate moves

Cap rates are set outside the building, which is why they move value more than operations do. The five-year Treasury works as a rough proxy, and it ran under 2% in early 2022, near 3% by the middle of that year, and close to 4% by 2025. Current levels are published daily by the US Treasury and weekly by the Federal Reserve. A cap rate lifted from a 2022 comparable and applied to a 2026 deal is not conservative. It is stale.

A single quoted cap rate carries that staleness forward, which is why a range across a five, five and a half, six and six and a half cap works better: it lets a reader see the return scenarios rather than accept one rate that may not be backed by much. The table above does that in basis points, holding NOI still so the movement shown is pure valuation exposure, the kind that arrives between signing and closing or between underwriting and exit.

The formula is not the hard part; the exit assumption is, and the operators who compound through a cycle treat theirs as a bet to stress-test rather than a figure to plug in.

Keep building your underwriting stack

We also recommend reading: Understanding Cap Rates · Fundamental Cap Rate Analysis: The Flex Stay Example · How Rating Agencies Shape CRE Prices

Frequently asked questions

Last updated: September 2026