What Is Cap Rate? Formula and How to Calculate It

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The cap rate (capitalization rate) is a property’s net operating income (NOI) divided by its current market value, expressed as a percentage. It estimates the annual return a property would produce if an investor bought it entirely with cash, before any mortgage payments and income taxes. Investors, appraisers and lenders use it to compare income-producing properties, to judge whether an asking price is reasonable relative to the income, and to estimate value from income.

Because the formula ignores financing, the cap rate describes the property, not the investor’s deal. Two buyers of the same building at the same price see the same cap rate, even if one pays cash and the other borrows 75% of the price.

The Cap Rate Formula

The standard formula is:

Cap rate = Net operating income / Current market value

Both inputs need careful definition, because small differences in how they are measured change the result.

What goes into net operating income

Net operating income is the property’s annual income after operating expenses. A typical NOI calculation looks like this:

1. Start with potential gross income: the rent the property would collect if fully leased, plus other income such as parking, laundry or storage fees.
2. Subtract an allowance for vacancy and credit loss (units that sit empty and tenants who do not pay) to get effective gross income.
3. Subtract operating expenses: property taxes, insurance, repairs and maintenance, property management, utilities paid by the owner, and similar running costs.

The result is NOI. Several items are deliberately left out:

• Mortgage principal and interest. Excluding debt service is what makes the cap rate an unlevered measure.
• Depreciation. It is a tax and accounting deduction, not a cash operating cost.
• Income taxes. These depend on the owner, not the property.
• Capital expenditures such as a new roof or HVAC system. Many analysts treat these separately or deduct a replacement reserve; practice varies, so it is worth checking whether a quoted NOI includes reserves.

Since NOI is the numerator, any optimism in the rent assumptions or omission of real expenses inflates the cap rate. A seller’s figure built on full occupancy and minimal maintenance will look better than one built on the property’s actual operating history.

Current value versus purchase price

The more common version of the formula divides by current market value. A second version divides by the original purchase price:

Cap rate = Net operating income / Purchase price

The purchase-price version has clear weaknesses. For a building bought decades ago at a much lower price, it produces an unrealistically high cap rate that says little about the property today. For an inherited property with no purchase price, it cannot be calculated at all. Because property values change over time, current market value gives a better picture of the return available on the capital tied up in the property right now. At the moment of acquisition the two versions are the same, since the price paid is the market value at that point.

How to Calculate Cap Rate: A Worked Example

Hypothetical example: an investor has $1,000,000 and is weighing two options. One is a Treasury bond paying a nominal 3% a year, treated here as the risk-free alternative. The other is a multi-tenant commercial building priced at $1,000,000.

1. Annual rent collected: $90,000
2. Operating expenses (maintenance and property taxes): $20,000
3. NOI: $90,000 minus $20,000 = $70,000
4. Market value: $1,000,000, assumed unchanged over the first year
5. Cap rate: $70,000 / $1,000,000 = 7%

The building’s 7% compares with 3% from the bond. The 4 percentage point difference is the extra return the investor is being paid for taking on property risk: tenants can leave, expenses can rise, and the building’s value can fall, none of which apply to holding a Treasury to maturity.

How the cap rate shifts when the inputs change

Keeping the same hypothetical building, each scenario below changes one input:

Two things stand out. First, a drop in income can push the property’s return below the risk-free rate, which is exactly the risk the extra 4% was meant to compensate. Second, a falling market value raises the cap rate even though nothing improved for the owner. For someone buying at $800,000, the 8.75% yield is real. For the existing owner, the higher figure simply reflects a $200,000 loss in value.

Using Cap Rate to Estimate Market Value

Rearranging the formula turns the cap rate into a valuation tool:

Market value = NOI / Cap rate

Appraisers and investors apply this by taking a property’s NOI and dividing it by the cap rate observed on comparable properties that recently sold. This is the income approach to valuation, often called direct capitalization.

Hypothetical example: a property’s NOI is $90,000 and comparable properties trade at a 4% cap rate. The estimated value is $90,000 / 0.04 = $2,250,000.

The same income at different cap rates shows how sensitive value is to this one assumption:

• At 4%: $90,000 / 0.04 = $2,250,000
• At 5%: $90,000 / 0.05 = $1,800,000
• At 6%: $90,000 / 0.06 = $1,500,000

A one-point change from 4% to 5% lowers the estimated value by $450,000, or 20%. This is why the choice of comparable cap rate is often the most contested number in a property negotiation, and why changes in market cap rates can move property values even when rents hold steady.

The cap rate is also the inverse of a price-to-NOI multiple. A 5% cap rate means paying 20 times NOI; a 4% cap rate means paying 25 times NOI.

What Cap Rate Tells You

A rough payback period. If NOI stays constant, the inverse of the cap rate approximates how many years of income it takes to equal the price. At 10%, that is about 10 years; at 5%, about 20 years. This is a simple payback figure: it ignores the time value of money, changes in income and any sale proceeds.

How the market prices risk and growth. Different cap rates reflect different levels of perceived risk and growth. Take two otherwise similar buildings, one in a prime city-center location and one on the outskirts. The central building earns higher rent, but part of that is offset by higher taxes and maintenance, and its market value is much higher. The result is typically a lower cap rate for the central building. Buyers accept the lower yield because they see steadier demand, lower vacancy risk and better prospects for value growth. The suburban building’s higher cap rate pays more income per dollar but carries more uncertainty. Neither is automatically the better buy; the investor has to decide whether the cap rate on offer is adequate for the risk.

Cap Rate as Required Return Minus Growth

The cap rate can also be derived from the Gordon Growth Model, a form of the dividend discount model used to value stocks:

Stock value = Expected annual dividend / (Required rate of return − Expected dividend growth rate)

Generalizing beyond dividends to any cash flow that grows at a constant rate and rearranging:

Expected cash flow / Asset value = Required rate of return − Expected growth rate

The left side has the same shape as the cap rate formula, with NOI as the cash flow and market value as the asset value. So:

Cap rate = r − g

where r is the investor’s required return and g is the expected annual growth in NOI. Strictly, the model uses next year’s expected cash flow, so a forward NOI estimate fits it best.

Hypothetical example: a property’s NOI is $50,000 and expected to grow 2% a year. The investor requires a 10% annual return. The implied cap rate is 10% − 2% = 8%, and the value the investor could justify paying is $50,000 / 0.08 = $625,000.

This framing explains why cap rates differ. A low cap rate can mean investors require a low return (the property is seen as safe), expect strong income growth, or both. A high cap rate can mean a high required return, weak growth expectations, or both. It also shows why cap rates tend to respond to interest rates: when yields on safer investments rise, investors’ required returns on property tend to rise too, pushing cap rates up unless growth expectations improve at the same time. The relationship is a tendency over time, not a fixed one-for-one link.

The model assumes constant growth forever, which no real property delivers, so it is a way of interpreting cap rates rather than a precise pricing formula.

Types of Cap Rates

The same ratio appears under several names depending on which NOI and which point in time it uses:

• Going-in cap rate: first-year NOI divided by the purchase price at acquisition.
• Exit or terminal cap rate: the cap rate assumed when estimating the sale price at the end of a projected holding period. Analysts often set it at or above the going-in rate to allow for an older building and uncertainty about future markets.
• Trailing cap rate: based on the actual NOI of the past 12 months.
• Forward or pro forma cap rate: based on projected NOI for the next 12 months, which may assume rent increases or lease-up of vacant space.
• Market cap rate: the typical cap rate at which comparable properties in a given market and property type are trading, used as the benchmark for direct capitalization.

When a listing quotes a cap rate, knowing which version it is matters. A pro forma cap rate built on rents the property has never achieved can look considerably better than the trailing figure. A large gap between the two signals assumptions, such as rent increases or filling vacant space, that deserve scrutiny.

What Affects Cap Rates

The extra return a property offers over risk-free bonds compensates for a set of risk factors:

• Age, location and condition of the property. Older buildings can need more capital spending; location affects demand and rent stability.
• Property type. Multifamily, office, industrial, retail and recreational properties carry different demand patterns and risks.
• Tenant credit and rent collection. A building leased to financially strong tenants who pay reliably is less risky than one with weaker tenants.
• Lease term and structure. Long leases lock in income; short leases expose the owner to re-leasing risk. Who pays taxes, insurance and maintenance under the lease changes the owner’s expenses and therefore NOI.
• Local market conditions. Competing properties, supply of new space and the depth of the buyer pool affect both rents and prices. Larger, well-established markets often attract more buyers, which tends to push prices up and cap rates down.
• Growth expectations. Expected population, employment and rent growth in an area can justify lower cap rates.
• Interest rates and the broader economy. Higher rates raise the return investors demand and the cost of financing, and regional economic conditions affect tenants’ businesses.

Owners can also influence a property’s cap rate through capital spending. A renovation that makes a building more attractive can support higher rents and raise NOI. Whether that raises the cap rate depends on what happens to value as well: if buyers then value the improved building at a market cap rate, the higher NOI translates into a higher price.

What Is a Good Cap Rate?

No single cap rate is good in every situation. A figure that is attractive for a stabilized apartment building in a growing city may be too low for an older retail center in a weak market, and the reverse.

Rules of thumb often quoted put a reasonable cap rate somewhere around 5% to 10%, with lower figures such as 4% associated with lower risk and a longer time to recover the investment. These ranges are starting points, not standards. The more useful questions are:

• What cap rates are similar properties of the same type, age and quality trading at in this market?
• Is the NOI behind the quoted cap rate realistic and based on actual results?
• Does the spread over safer investments compensate for the specific risks of this property?
• What return does the investor need, and what growth is plausible? (The r − g framework turns these into an implied cap rate.)

Is a higher or lower cap rate better?

It depends on the investor’s goals and risk tolerance. Investors seeking current income may lean toward higher cap rates; those prioritizing safety and long-term appreciation may accept lower ones. A high cap rate on a property whose income is about to fall is not a bargain, and a low cap rate on a property with no growth prospects is simply expensive.

Cap Rate vs. Other Return Measures

Return on investment (ROI). ROI measures the total gain over a specific holding period relative to the amount invested, and it can include sale profits and the effect of financing. The cap rate describes the property’s current or expected one-year income yield on its value, without leverage.

Cash-on-cash return. This divides annual pre-tax cash flow after debt service by the actual cash the investor put in (down payment and closing costs). It reflects financing: with a mortgage at a rate below the cap rate, cash-on-cash return can exceed the cap rate; with expensive debt, it can fall below it.

Internal rate of return (IRR). IRR accounts for every cash flow over the holding period, including growth in income and the eventual sale, and weights them by timing. It addresses the time value of money and the changing cash flows that the cap rate leaves out.

Gross rent multiplier (GRM). GRM divides price by gross rent, so it ignores expenses entirely. It is quicker but cruder than the cap rate.

Limitations of Cap Rate

• It ignores leverage. Most investment property is bought with debt, and the cap rate says nothing about mortgage costs or the investor’s actual cash return.
• It is a single-year snapshot. It does not account for the time value of money, rent growth, lease expirations, major repairs, shifts in the rental market or the proceeds from a future sale.
• It depends on the quality of the NOI. Projected income is an estimate, and cap rates built on projections can vary widely from what the property actually earns.
• It works poorly for irregular income. For properties with uneven cash flows, such as buildings being repositioned, leased up or heavily renovated, a discounted cash flow model is usually a better tool.
• Comparisons need truly comparable properties. Comparing cap rates across property types, markets or lease structures can mislead, because the differences in risk are what the cap rates are pricing.

The Bottom Line

Cap rates help real estate investors, appraisers and lenders compare similar income properties and estimate value from income. Treat any quoted figure as a one-year, unlevered snapshot. Check whether it rests on actual or projected NOI, and compare it only with similar properties in the same market. For financed deals or uneven cash flows, pair it with cash-on-cash return, IRR or a discounted cash flow model.