Capitalization rate - commonly called cap rate - is the single most important metric in commercial real estate investing. Whether you are evaluating your first rental property or underwriting a $10 million acquisition, knowing how to calculate cap rate gives you an immediate snapshot of a property's return potential.

The cap rate formula is simple: divide the property's net operating income (NOI) by its current market value or purchase price. A property generating $100,000 in NOI with a value of $1,500,000 has a cap rate of 6.67%. But the real skill is in calculating NOI correctly, and that is where most investors make costly mistakes.

This guide walks you through every step, with worked examples for apartment buildings, retail strip centers, and office properties. For a broader overview of what cap rates mean and why they matter, start with our guide on cap rate explained.

What Is the Cap Rate Formula and How Does It Work?

The cap rate formula measures a property's unlevered return - meaning the return you would earn if you paid all cash with no mortgage. The formula is:

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

For example, a commercial property with $75,000 in annual NOI and a market value of $1,000,000 has a cap rate of 7.5%. This tells you that the property generates a 7.5% annual return on its total value before any financing costs.

According to CBRE's H1 2025 Cap Rate Survey, the average cap rate fell by 9 basis points during the first half of 2025 across more than 3,600 estimates in 50+ markets. That small shift represents billions of dollars in property value changes across the national market, which shows why understanding this metric matters.

The cap rate is useful for three main purposes. First, it lets you compare different investment opportunities on an apples-to-apples basis. Second, it helps you estimate a property's value when you know the income (the reverse cap rate formula). Third, it gives you a quick benchmark to see whether a deal is priced fairly compared to the broader market.

How Do You Calculate Net Operating Income for a Cap Rate Analysis?

Net operating income is your property's total income minus all operating expenses, excluding mortgage payments, income taxes, depreciation, and capital expenditures. Calculating NOI accurately is the foundation of every cap rate analysis, and getting it wrong will throw off your entire investment evaluation.

Here is the NOI formula broken down:

NOI = Gross Rental Income - Vacancy Loss + Other Income - Operating Expenses

Start with gross rental income, which is the total rent you would collect if every unit or space were leased at market rates for the full year. For a 20-unit apartment building where each unit rents for $1,000 per month, gross rental income is $240,000 per year.

Next, subtract vacancy and credit loss. No property stays 100% occupied forever. Industry standard is to use a vacancy factor between 5% and 10%, depending on the property type and local market conditions. Multifamily properties in strong markets might use 5%, while office buildings in weaker markets could use 15% or more.

Then add any other income the property generates beyond rent. This includes parking fees, laundry income, storage unit rentals, late fees, vending machines, and application fees. These ancillary income streams can add 2-4% to your effective gross income.

Finally, subtract all operating expenses. This is where investors most commonly make errors, so let's break down exactly what to include and what to exclude.

What Should You Include in Operating Expenses When Calculating Cap Rate?

Operating expenses for a cap rate calculation should include every recurring cost required to operate and maintain the property, but not financing costs or capital improvements. Getting this distinction right is critical because including the wrong items will produce a misleading cap rate.

Always include these operating expenses:

• Property taxes - Usually the largest single expense, typically 1-2% of assessed value
• Property insurance - Commercial property and liability coverage
• Property management fees - Typically 4-10% of effective gross income (include this even if you self-manage)
• Maintenance and repairs - Routine upkeep like plumbing, electrical, appliance repair
• Utilities paid by owner - Water, sewer, trash, common area electricity
• Landscaping and grounds - Lawn care, snow removal, parking lot upkeep
• Professional fees - Accounting, legal, and licensing costs
• Advertising and leasing - Marketing to fill vacancies
• Replacement reserves - Typically $250-$500 per unit per year for multifamily

Never include these items:

• Mortgage payments - Financing costs, not operating costs
• Income taxes - Specific to the individual investor
• Depreciation - Accounting entry, not a cash expense
• Capital expenditures - Major one-time improvements like a new roof or HVAC
• Tenant improvements - One-time buildout costs for commercial tenants

As JPMorgan explains in their cap rate guide, the cap rate measures potential return without considering financing - which is why mortgage payments are always excluded from the NOI calculation.

What Are Average Cap Rates by Property Type Right Now?

Average cap rates vary significantly by property type, class, and location. Knowing current market cap rates is essential for determining whether a specific property is priced fairly and for using the reverse cap rate formula to estimate values.

According to the CBRE H1 2025 Cap Rate Survey, current average cap rates by property type are:

• Industrial - 5.2% (lowest cap rate, reflecting strong investor demand)
• Multifamily - 5.3% (Class A at 4.74%, Class B at 4.92%, Class C at 5.38%)
• Self Storage - 5.8% (Class A at 5.0-5.5%, Class B at 5.5-6.5%)
• Retail - 6.4% (neighborhood and strip centers)
• Office (Class A) - 6.4% (stabilized, well-located properties)
• Office (Class B/C) - 8.7% and higher (reflecting market uncertainty)

Lower cap rates generally indicate lower perceived risk and higher investor demand. Industrial and multifamily command the lowest cap rates due to stable cash flows and strong tenant demand. Office properties, especially Class B and C buildings, carry the highest cap rates due to remote work uncertainty and elevated vacancy.

The CBRE H2 2025 survey noted that nearly a quarter of retail, industrial, and hotel respondents believe cap rates have peaked and will start declining over the next six months as more interest rate cuts are anticipated in 2026.

When you calculate cap rate on a specific property, compare it against these market benchmarks. If a multifamily property shows a 9% cap rate in a market where 5.3% is average, something is likely off - either the NOI is inflated, the property has significant issues, or you may have found an underpriced opportunity worth investigating.

How Do You Calculate Cap Rate on an Apartment Building?

Let's walk through a complete cap rate calculation for a 20-unit apartment building. This example includes every line item so you can see exactly how NOI is built from scratch.

Property details: 20 units, average rent $1,000/month, located in a mid-sized metro area, purchased for $2,200,000.

The cap rate of 6.35% tells us this property is generating a reasonable return compared to the national multifamily average of 5.3%. The higher-than-average cap rate likely reflects either the property's class (B or C), its location in a secondary market, or some deferred maintenance that introduces risk.

Notice that we included a property management fee of 8% even though the owner might self-manage. This is standard practice because any future buyer will likely use a professional manager, and the cap rate should reflect the property's economics under typical ownership - not just your personal situation.

If you are evaluating apartment building loans, the cap rate directly influences how much a lender will finance. Most lenders want to see that a property's cap rate exceeds their required debt yield, which provides a cushion of safety. Use our DSCR calculator to see how the property's NOI translates into loan qualification.

How Do You Calculate Cap Rate on a Retail or Office Property?

Retail and office properties follow the same cap rate formula but have different expense profiles and vacancy assumptions. Here are complete examples for both property types.

Retail Strip Center Example:

A 6,000 sq ft retail strip center with 4 tenants, each paying an average of $2,500/month on NNN (triple net) leases, purchased for $1,560,000.

With NNN leases, tenants pay property taxes, insurance, and maintenance directly. The owner's remaining expenses are limited to management (6%), vacancy loss (10% for retail), and common area maintenance reserves. The NOI comes to $109,200, producing a cap rate of 7.0%.

Small Office Building Example:

A 10,000 sq ft office building with 5 tenants on gross leases paying an average of $32/sq ft, purchased for $2,100,000.

With gross leases, the owner pays most operating expenses. Higher vacancy (15% for office) and full expense responsibility reduce the NOI to $158,460, producing a cap rate of 7.55%.

The office building has the highest cap rate of the three examples at 7.55%, reflecting the higher risk associated with office properties in today's market. The retail strip center falls in the middle at 7.0%, while the apartment building at 6.35% carries the lowest cap rate and lowest perceived risk.

These differences matter when you are shopping for acquisition loans. Lenders evaluate cap rates alongside debt service coverage ratios when sizing loans. A property with a thin cap rate relative to borrowing costs may not qualify for the leverage you need. Run the numbers through our commercial mortgage calculator to see how financing costs compare to the property's cap rate.

How Do You Use the Reverse Cap Rate Formula to Find Property Value?

The reverse cap rate formula is one of the most powerful tools in commercial real estate. Instead of calculating the cap rate from a known price, you estimate the property's value from its income.

Property Value = NOI / Cap Rate

This is the income approach to valuation, and it is how commercial appraisers, lenders, and institutional investors determine what a property is worth.

Here is how it works in practice. Say you own a property generating $150,000 in NOI. If comparable properties in your market are trading at a 6% cap rate, your property's estimated value is:

$150,000 / 0.06 = $2,500,000

Now look at how sensitive that value is to cap rate changes:

At a 4.5% cap rate, that same $150,000 NOI supports a $3.33 million valuation. At an 8.5% cap rate, the value drops to just $1.76 million. That is a $1.57 million swing from the same income stream - which is why even small cap rate changes in the market can have massive effects on property values.

This reverse formula is also how you can back into a purchase price during negotiations. If you know the market cap rate and you have verified the property's NOI, you know exactly what the property should be worth. Any price above that means the seller is asking for a below-market cap rate, and any price below it means you may be getting a deal.

Investors pursuing value-add strategies use the reverse cap rate formula to project exit values. If you can increase NOI by $50,000 through renovations and rent increases, and the market cap rate is 6%, you have created $833,333 in additional property value.

How Do You Find Market Cap Rates for Comparison?

Finding accurate market cap rates requires combining multiple data sources. No single source gives you the complete picture, but using several together will give you a reliable range for your target property type and market.

The best sources include CBRE's semiannual Cap Rate Surveys covering 50+ metros, CoStar and LoopNet for listing and transaction data, local commercial brokers who specialize in your property type, public records of recent comparable sales, and lender appraisals that include detailed market cap rate analysis.

When comparing cap rates, always match property type, class, and location. A Class A multifamily property in a primary market will have a vastly different cap rate than a Class C office building in a secondary market.

Also watch for whether a reported cap rate is based on trailing 12-month NOI (T-12) or projected NOI (pro forma). A property advertised at a 7% cap rate on pro forma income might only deliver 5.5% on actual trailing performance. Always verify the NOI assumptions behind any stated cap rate. Need help analyzing a deal? Contact our team for guidance on underwriting and financing.

What Are the Most Common Cap Rate Calculation Mistakes?

Even experienced investors make cap rate errors that lead to overpaying for properties or misjudging returns. Here are the six most common mistakes and how to avoid them.

Mistake 1 - Including mortgage payments in operating expenses. NOI must always be calculated before debt service. Including your mortgage payment deflates NOI and produces a cap rate that is meaningless for comparison.

Mistake 2 - Using the asking price instead of market value. The cap rate should reflect either the actual purchase price or the appraised market value. An inflated asking price makes the cap rate look lower than reality.

Mistake 3 - Omitting management fees when self-managing. Always include a management fee (6-10% of effective gross income) even if you self-manage. Future buyers will price in professional management, so the cap rate should reflect standard market assumptions.

Mistake 4 - Failing to normalize expenses. If the property had an unusual maintenance year, that single year will distort NOI. Use a 3-year average or normalize for one-time items.

Mistake 5 - Using 100% occupancy. Always include a vacancy factor that reflects market reality. As Origin Investments notes, consistent vacancy assumptions are essential for accurate comparisons.

Mistake 6 - Relying on cap rate as the only metric. Cap rate does not account for financing terms, appreciation, tax benefits, or capital needs. Pair it with cash-on-cash return, DSCR, and IRR for a complete picture. Our DSCR calculator can help evaluate the financing side.

If you are a first-time commercial real estate investor, spending extra time on these details will protect you from making expensive mistakes on your first acquisition.

Frequently Asked Questions About Calculating Cap Rate

What is a good cap rate for commercial real estate?

A good cap rate depends entirely on the property type, location, and current market conditions. As of mid-2025, industrial and multifamily properties trade at 5.0-5.5% cap rates in primary markets, while retail runs 6.0-7.0% and office ranges from 6.4% to over 9% depending on class. Generally, a cap rate between 5% and 8% is considered healthy for most commercial property types. Higher cap rates suggest higher risk and higher potential returns, while lower cap rates indicate more stable, lower-risk investments.

Does a higher cap rate mean a better investment?

Not necessarily. A higher cap rate means higher current yield relative to price, but it usually signals higher risk. A 10% cap rate on an office building might reflect high vacancy, deferred maintenance, or a declining submarket. A 5% cap rate on a Class A apartment complex might actually be the safer, more profitable long-term investment when you factor in appreciation, tenant quality, and stable cash flows. Always investigate why a cap rate is high before assuming it represents a good deal.

How does cap rate differ from cash-on-cash return?

Cap rate measures the property's return assuming an all-cash purchase with no financing. Cash-on-cash return measures the actual return on the cash you invested after accounting for mortgage payments. For example, a property with a 6% cap rate might produce a 10% cash-on-cash return if you use favorable leverage, or a 3% cash-on-cash return if your debt costs are high. Cap rate is useful for comparing properties regardless of financing, while cash-on-cash return shows your actual investment performance.

Can you calculate cap rate on a single-family rental property?

Yes, the formula works the same way for any income-producing property. Calculate your annual NOI and divide by the property value. However, cap rates are used less frequently for single-family rentals because these properties are typically valued based on comparable home sales rather than income. Cap rate analysis is most valuable for commercial properties where the income approach drives valuation.

How often should you recalculate cap rate on a property you own?

Recalculate your cap rate at least annually, or whenever significant changes occur. Review it after rent increases, when property taxes are reassessed, after major expense changes like insurance premium hikes, or when market conditions shift. Tracking your cap rate over time helps you understand whether your property's performance is improving or declining relative to the market, and it helps you time decisions about refinancing or selling.

What is the relationship between cap rates and interest rates?

Cap rates and interest rates generally move in the same direction, though not in lockstep. When interest rates rise, borrowing costs increase and cap rates typically expand (pushing property values lower). When rates fall, cheaper financing increases investor demand, compressing cap rates and pushing values higher. The spread between cap rate and borrowing cost matters most - a 6% cap rate with 4% debt means positive leverage, while a 6% cap rate with 7% debt means negative leverage that reduces your return.

What Is the Bottom Line on Calculating Cap Rate?

Calculating cap rate accurately comes down to getting the NOI right. Follow the five-step process outlined in this guide: start with gross rental income, subtract vacancy loss, add other income, subtract operating expenses (never include mortgage payments), and divide the resulting NOI by the property value.

The cap rate you calculate is only as reliable as the numbers you put into the formula. Verify rental income with actual leases, confirm expenses with trailing 12-month operating statements, and use realistic vacancy assumptions for the property type and market.

Remember that cap rate is a starting point for analysis, not the finish line. Pair it with cash-on-cash return, DSCR, and a thorough physical inspection before making any investment decision. And when you are ready to finance your next acquisition, contact Clearhouse Lending to discuss loan options tailored to your specific property type and investment strategy.

Whether you are analyzing a self-storage facility, a multifamily complex, or a retail center, the cap rate formula remains the same. Master the calculation, avoid the common mistakes, and you will have a reliable tool for evaluating any commercial property that comes your way.

Ready to move forward on a deal? Reach out to our team for a free consultation on financing options for your next commercial property investment.