Cap Rate in Real Estate: What It Is, How to Calculate It, and What's Actually Good

If you've spent any time researching real estate investing, you've run into cap rate. It shows up in property listings, investment analyses, podcasts, and conversations between investors constantly. Investors say things like "I only buy markets above a 6 cap" or "this building is trading at a 5 cap." If you're new, those sentences sound like a foreign language.

Cap rate is genuinely useful once you understand exactly what it measures and what it doesn't. This guide covers both.

What Is Cap Rate?

Cap rate (short for capitalization rate) measures the return you'd earn on a property if you paid all cash. No mortgage, no financing.

It answers one question: if I bought this property outright with cash, what percentage of the purchase price would I earn back every year from rental income?

The formula:

Cap Rate = Net Operating Income (NOI) / Property Value x 100

Where property value is the purchase price (or current market value, depending on how you're using it).

That's it. Two numbers. The math is simple. The tricky part is knowing what goes into NOI.

What Is NOI?

Net operating income is your total rental income minus all operating expenses. The key word is "operating." Mortgage payments do not count.

NOI = Gross Rental Income - Operating Expenses

What goes into operating expenses:

• Property taxes
• Landlord insurance
• Property management fees (typically 8 to 12% of rent)
• Repairs and routine maintenance
• CapEx reserves (saving up for future big-ticket replacements like roof, HVAC, appliances)
• Vacancy allowance (typically 5 to 10% of gross rent)
• Utilities paid by the owner
• HOA fees

What does NOT go into NOI:

• Mortgage principal and interest payments
• Income taxes
• Depreciation

This is the part that trips most beginners. Cap rate is a property-level metric. It measures the asset itself, completely separate from how you're financing it. Two investors buying the same property with different loan amounts will have very different monthly cash flows, but the same cap rate. That's intentional. It's what makes cap rate useful for comparing deals.

Cap Rate Calculation: A Real Example

Here's a straightforward example so the formula clicks.

Property details:

• Purchase price: $200,000
• Monthly rent: $1,600
• Annual gross income: $19,200
• Annual operating expenses: $8,640 (45% of gross, which covers taxes, insurance, management, repairs, CapEx, and vacancy)
• Annual NOI: $10,560

Cap Rate: $10,560 / $200,000 = 5.28%

That property generates a 5.28% all-cash return.

Here's a more detailed breakdown with every expense line itemized:

Property: 3-bed/2-bath single-family rental, purchase price $200,000

Annual income:

• Gross annual rent: $21,600 ($1,800/month)
• Vacancy allowance (8%): -$1,728
• Effective Gross Income: $19,872

Annual operating expenses:

• Property taxes: $2,400
• Insurance: $1,200
• Property management (10%): $1,987
• Repairs and maintenance: $2,000
• CapEx reserve: $1,440
• Total expenses: $9,027

NOI = $19,872 - $9,027 = $10,845

Cap Rate = $10,845 / $200,000 = 5.42%

This more detailed example shows why shortcuts can mislead you. If someone just divides gross rent by purchase price, they'd get $21,600 / $200,000 = 10.8%. That's not cap rate. That's the gross rent multiplier, and it's not a useful number for making investment decisions.

What Is a Good Cap Rate?

There's no single answer. Cap rate is highly market-dependent, and what's strong in one city is weak in another.

The reason is simple: cap rate reflects how expensive a market is relative to the rents it generates. In San Francisco, property prices are enormous compared to the rent those properties produce. Investors accept 3% cap rates there because they expect significant appreciation. In Memphis, Tennessee, you can find 8% cap rates because prices are lower relative to rents, but appreciation is slower and the tenant profile is different.

Rough benchmarks by market type:

| Market Type | Typical Cap Rate | |---|---| | Primary markets (NYC, LA, SF, Boston) | 3 to 4% | | Large secondary markets (Chicago, Dallas, Denver) | 4 to 6% | | Mid-tier markets (Columbus, Indianapolis, Memphis) | 6 to 8% | | Tertiary or rural markets | 8 to 12% and up |

Higher cap rates are not automatically better. They usually mean one or more of the following:

• Lower appreciation expectations
• Higher perceived risk (weaker tenant pool, declining population, higher crime)
• Less competition from institutional money
• More management-intensive properties

Lower cap rates typically mean:

• Strong appreciation expectations
• Prime location with high demand
• Lower cash flow (the price is high relative to income)
• More competition from other investors

A 9% cap rate in a shrinking Rust Belt city is not necessarily better than a 5% cap rate in a growing Sun Belt market. The total return picture matters, not just the income yield.

Cap Rate vs. Cash-on-Cash Return

This is where beginners get confused most often. Cap rate and cash-on-cash return are related but measure very different things.

Cap rate: Measures property performance, ignores financing completely.

Cash-on-cash return: Measures your personal return on the cash you actually invested, fully accounting for your specific mortgage payment.

Same property, same NOI, but watch what happens when you change the financing:

| Scenario | Purchase Price | NOI | Cap Rate | Annual Cash Flow | |---|---|---|---|---| | All cash | $200,000 | $10,560 | 5.28% | $10,560 | | 25% down at 7% rate | $200,000 | $10,560 | 5.28% | About $1,400 after debt service | | Subject-to at 3.5% rate | $200,000 | $10,560 | 5.28% | About $5,800 after debt service |

The cap rate is identical in all three scenarios. The actual cash in your pocket is completely different. With today's interest rates, many properties that look reasonable on cap rate do not cash flow positively when financed with a conventional loan. That's not a cap rate problem. It's a reminder that you need both metrics.

Use cap rate to: Compare properties in the same market, screen deals quickly, estimate property value.

Use cash-on-cash return to: Evaluate what you'll actually earn with your specific financing.

Using Cap Rate to Value a Property

Cap rate isn't just a return metric. You can use it to figure out what a property should be worth.

Property Value = NOI / Market Cap Rate

If comparable properties in a neighborhood trade at a 7% cap rate, and the property you're analyzing has an NOI of $14,000:

Value = $14,000 / 0.07 = $200,000

This is how commercial real estate appraisers value income-producing properties. The math works in reverse too. If you know what you want to pay and what the market cap rate is, you can figure out what NOI you need to justify the price.

Practical use: This formula becomes powerful when you want to identify over or underpriced deals.

• NOI of $14,000, market cap rate of 7%, property worth $200,000
• Listed at $240,000: implied cap rate is 5.8%. Probably overpriced for this market.
• Listed at $165,000: implied cap rate is 8.5%. Potentially underpriced. Worth investigating.

It also shows why value-add investors focus so heavily on increasing NOI. If you raise rents or cut expenses on a property in a 7% cap rate market, every dollar of NOI increase adds about $14 of property value. That's forced appreciation through operations, not waiting around for the market to move.

Going-In vs. Stabilized Cap Rate

One more concept worth knowing before you analyze your first deal.

Going-in cap rate: The cap rate based on current actual income at the time of purchase. If a property is partially vacant or below-market rented, this number will be lower than the true potential.

Stabilized cap rate: The cap rate based on what the property will earn once it's fully leased at market rents. A more accurate picture of long-term investment performance.

When you're looking at a value-add property, always calculate both. The gap between them is your upside. If the going-in cap rate is 4.5% but the stabilized cap rate at market rents would be 7.5%, you're buying below the market rate with room to force the value up through renovations, lease-up, and rent increases.

Common Cap Rate Mistakes

Using asking rent instead of market rent. If the current tenant is paying below market, the NOI looks lower and the cap rate looks worse than reality. Always run your analysis with actual market rent. If the tenant is paying above market, the same issue works in reverse and the seller's numbers look too good.

Trusting the seller's pro forma. "Pro forma" means projected. Sellers project NOI based on ideal assumptions: full occupancy, no CapEx, minimal repairs. Ask for actual operating history, then rebuild the expense analysis yourself.

Forgetting CapEx and vacancy. Many simplified cap rate calculations leave these two out. Including them properly will drop your apparent cap rate by 1 to 2 percentage points. If you forget them, your deal analysis will be wrong and you'll overpay.

Comparing cap rates across different property types or neighborhoods. A 6% cap rate on a Class A apartment building in a growing city is completely different from a 6% cap rate on a Class C house in a neighborhood with 15% vacancy. Cap rate doesn't capture risk. Two properties with the same cap rate can have wildly different actual risk profiles.

Confusing GRM with cap rate. The Gross Rent Multiplier divides purchase price by gross annual rent. It's a fast screening tool, not a cap rate. Don't use one when you mean the other.

Ignoring market cap rate trends over time. Cap rates compressing (going lower) signals rising prices and increasing competition. Cap rates expanding (going higher) signals softening prices or rising risk perception. Tracking market cap rates over time tells you whether deals are getting harder or easier to find.

Cap Rate Quick Reference

Below 4%: Expensive coastal and gateway markets. Appreciation-focused investing. Cash flow is typically minimal. You're betting on price growth, not income.

4 to 6%: Large secondary markets. Decent appreciation potential, moderate cash flow. Institutional capital competes heavily in this range.

6 to 8%: Mid-market sweet spot for cash-flow investors. Less institutional competition, reasonable appreciation, workable numbers if you finance correctly.

8 to 10%: Higher-yield markets or value-add deals. Strong cash flow potential if you know the local market. Usually more management-intensive.

Above 10%: Proceed carefully. High cap rates often signal high risk: weak neighborhoods, high vacancy rates, major deferred maintenance, or a market with a shrinking population. Sometimes they're legitimate value-add opportunities. Often they're priced high for a reason.

How to Use Cap Rate When Looking at Deals

Quick screening: Before spending time on detailed analysis, check the cap rate. If it's well below the market average with no clear explanation, skip it or negotiate the price down. If it meets or exceeds market norms, keep digging.

Comparing two properties in the same market: Two duplexes in the same neighborhood, one at 5.8% cap rate and one at 7.1% cap rate. All else equal, the 7.1% is generating more income per dollar invested. Start your deeper analysis there.

Negotiating price: If a seller prices their property at a 4% cap rate when comparable properties trade at 6%, you have a data-backed argument for a lower offer. Run the math, show your work, and let the numbers do the talking.

Tracking market trends: Follow cap rates in your target market over time. Rising cap rates mean deals improving. Falling cap rates mean prices increasing and more competition.

The Bottom Line

Cap rate is a tool, not a verdict. A 7% cap rate in one market is a great deal. A 7% cap rate in another market is average. The number only means something in context.

Use it to compare similar properties in the same market, to value deals based on income, to back into what you should pay, and to track whether a market is getting more or less competitive over time.

What cap rate will not tell you is how your deal actually performs with financing, what the neighborhood trajectory looks like, or whether the tenant situation is sustainable. For that you need cash-on-cash return, local market knowledge, and your own due diligence on the ground.

Combined with those other inputs, cap rate becomes one of the most useful numbers in your deal-analysis toolkit.

Ready to run the numbers on a specific property? Use our free cap rate calculator and enter the purchase price, rent, and expenses to get your answer in seconds.