What Is a Good Cap Rate? A Practical Guide

“What is a good cap rate?” is the most common question about the metric, and the honest answer is that the question is slightly wrong. A cap rate is a price, not a grade. Asking whether it is good is like asking whether a stock price is good without knowing the company.

What the number does tell you is how much annual income the property produces for each dollar of price. That is useful — but only when compared with the right things.

The formula, briefly

Cap rate = Net operating income ÷ Purchase price

Net operating income is effective gross income minus operating expenses. It excludes debt service, capital expenditure, depreciation and income tax. The NOI guide works through the full derivation; the cap rate calculator applies it to your numbers.

Because both terms are annual figures, a cap rate is a snapshot of one year at one set of assumptions.

Three properties, three cap rates

Here are three properties in the same metropolitan area, each with its own rent, expenses and price:

Property	Price	NOI	Cap rate
A	$450,000	$31,480	7.00%
B	$380,000	$25,676	6.76%
C	$205,000	$16,412	8.01%

A has the highest price and the highest NOI, but not the highest cap rate. C has the lowest price and the highest cap rate. If cap rate were a quality score, C would win. In practice the three numbers are telling you about three different properties:

• A is priced for a market where buyers expect rent growth and accept a 7% current yield.
• B trades at a lower yield, which usually reflects either a stronger location or more optimistic expectations about the future.
• C offers more current income per dollar, typically because the building is older, the area is weaker, or the rent roll is less secure.

None of those interpretations can be confirmed from the cap rate alone. That is the point: the cap rate tells you what the market is paying for the income, and the rest of the analysis tells you why.

What the cap rate encodes

A cap rate is the result of everything buyers believe about a property and a market at a moment in time:

• Growth expectations. If buyers expect rents or values to rise, they will accept a lower current yield.
• Risk. Older buildings, short leases, single-tenant exposure and weak locations usually require a higher yield to attract capital.
• Financing conditions. When debt is cheap and available, buyers can pay more for the same income, which compresses cap rates.
• Property type. A single-family rental and a 100-unit apartment building attract different buyers and do not share a cap rate.
• Condition and deferred maintenance. A property needing a roof prices differently from a stabilised one, even with the same rent roll.

What the cap rate does not encode

The exclusions are just as important:

• Capital expenditure. NOI excludes capex, so the cap rate does not know the roof is 20 years old.
• Financing. The metric is unlevered. A property has the same cap rate whether bought with cash or 80% debt.
• Income tax and depreciation. Those are after-tax questions, and this site does not model them.
• The quality of the rent roll. A cap rate built on one tenant with a lease expiring next year is not the same as one built on ten tenants on staggered terms.
• Management quality. Two identical buildings can have different NOI depending on how well they are run.

The comparison rule

A cap rate is only comparable with a cap rate computed from the same conventions, for a similar property, in the same market, at the same time. Any comparison that crosses one of those lines is measuring the difference between two markets or two sets of assumptions, not the difference between two deals.

That rule sounds academic until it is applied. A 5% cap rate in an expensive coastal market and an 8% cap rate in a Midwestern market are not evidence that the second is a better investment. They are evidence that two markets price income differently.

A cross-check that catches bad numbers

Two listings can quote the same cap rate and be very different deals. The operating expense ratio is the fastest way to see which one is missing expenses:

Operating expense ratio = Operating expenses ÷ Effective gross income

A property showing a 7% cap rate with an expense ratio of 25% is claiming to run at a cost structure that is unusually lean for residential rental. That usually means management, maintenance, insurance or tax is understated — or that the rent is pro forma. The same cap rate with a 40% expense ratio is more believable.

This is why the cap rate calculator shows both numbers, and why the deal analyzer shows the full expense breakdown rather than a single yield.

Is there a range that counts as normal?

For US residential property, cap rates are often quoted in the 4% to 8% range, with lower figures in expensive coastal markets and higher figures in markets with older housing stock and lower price growth. That range is a description of what has been common, not a standard. It also moves with interest rates: when the cost of debt rises, the yield buyers require tends to rise with it.

A cap rate outside that range is not automatically a red flag. It is a prompt to ask why, and the answer is usually in the rent and the expense line.

Using cap rate in a decision

The metric is most useful as a comparison tool:

1. Compute cap rates for similar properties in the same market using the same conventions.
2. Check the expense ratio for each one.
3. Ask what the rent assumption is based on — an in-place lease or a projection.
4. Then decide whether the difference in yield compensates for the difference in property quality and risk.

What the cap rate cannot do is tell you whether to buy. That is a judgment about your own return requirements and risk tolerance, and it belongs to you, not to a ratio.

Sources

• Appraisal Institute — professional standards and the income approach to value
• Consumer Financial Protection Bureau — Understand the different kinds of loans available