Capitalization (or cap) rate is a 12-month assessment that measures how quickly an investor can make back what they spent on an investment property. In other words, it’s the rate of return that property is expected to generate.

Cap rate is a useful metric for quickly comparing multiple potential real estate investments. It is similar to other return on investment metrics, however, in that it isn’t a perfect predictor of a property’s success. Cap rate should always be considered in context and in coordination with other metrics to get the fullest picture of a potential investment’s profitability.

The formula to calculate cap rate for a real estate investment is as follows:

As you can see, there are two components of the cap rate formula: The property’s net operating income (NOI) and its current market value.

NOI is the income a property generates after regular, monthly expenses are subtracted, excluding variable expenses like maintenance, taxes, and interest. Given this, NOI is calculated as follows:

𝑁𝑒𝑡 𝑂𝑝𝑒𝑟𝑎𝑡𝑖𝑛𝑔 𝐼𝑛𝑐𝑜𝑚𝑒 (𝑁𝑂𝐼)=𝐺𝑟𝑜𝑠𝑠 𝑂𝑝𝑒𝑟𝑎𝑡𝑖𝑛𝑔 𝐼𝑛𝑐𝑜𝑚𝑒−𝑂𝑝𝑒𝑟𝑎𝑡𝑖𝑛𝑔 𝐸𝑥𝑝𝑒𝑛𝑠𝑒𝑠

Note that vacancy loss is accounted for in NOI, meaning your gross operating income in the formula above should exclude any income you would lose due to vacancies throughout the year.

The bottom half of the cap rate formula is simply the property’s current market value. This is the present-day value of the property. You can get this number via a formal appraisal or by doing a comparative market analysis.

Cap rate is best used when analyzing potential long-term, income-generating investment properties. When real estate investors are looking at multiple properties with different features, prices, and risks, cap rate provides a baseline metric that can be compared across properties to assess future profitability.

Cap rate is not the best metric to use for short-term investments like fix-and-flips. This is because the cap rate calculation does not include the upfront cost of repairs and renovations, nor the fac that you’ll be selling the property instead of holding it to generate income. Cap rate may also be an inappropriate metric when financing plays a large role, since the calculation does not account for financing costs. In this situation, a metric like cash-on-cash return may be more useful.

Using Innago’s real estate cap rate calculator is a quick and easy way to project an estimate of a property’s future income. Let’s look at the inputs you’ll need as well as the result.

Here are the inputs you’ll need to use in the calculator:

Current market value

Annual potential rental income

Annual vacancy loss

Annual operating expenses

Current market value is the present-day property value, found via an appraisal or comparative market analysis. Note that this isn't necessarily the same as the property's purchase price.

Annual potential rental income is the sum of all types of income you expect to generate from the rental property over a 12-month period. You should include all the following:

Rents

Nonrefundable deposits

Pet rent

Parking fees

Tenant utility payments

Any other payments received for the use or occupation of a property

Annual vacancy loss is the amount of rental income you’d expect to lose when your property is vacant throughout the year. This can be found by estimating how many weeks or months of the year you’d expect to find your property vacant, then multiplying to determine how much income you’d lose at the rate you intend to rent the unit for.

Lastly, annual operating expenses are the sum of all non-variable, regular expenses you expect to incur from a property to cover its day-to-day operations. In your annual operating expenses, be sure to include:

Property management fees (including software fees)

Advertising and listing fees

Landlord insurance premiums

Property taxes

Cleaning and maintenance fees

Supplies

Travel costs if you travel to your office/properties

Legal fees

HOA fees

Utilities you cover

After you’ve entered the above inputs, the cap rate formula calculator will generate a few outputs, including your cap rate:

Gross operating income

Net operating income

Cap rate

Gross operating income is simply your total rental income accounting for vacancy loss. Subtract your operating expenses from that, and you get your net operating income (NOI).

NOI is used in the final calculation for cap rate, which is expressed as a percentage.

What is a good cap rate?

According to Investopedia, most analysts consider a “good” cap rate to be between 5% and 10%, as these usually indicate the best balance of returns and risk tolerance. Because cap rate is a ratio between a property’s valuation and its return, the best cap rate is a balanced one.

A high cap rate typically indicates a higher return on investment but often comes with higher risk (e.g., properties in less desirable locations or with volatile income streams).

A low cap rate suggests a lower return, but these properties are usually seen as lower risk (e.g., in stable, high-demand areas with more reliable income).

Investors seeking higher returns and willing to take on more risk may prefer a high cap rate, while those prioritizing stability may favor a low cap rate.

That being said, there is no definite standard for “good” or “bad” cap rates. The meaning of your cap rate largely depends on the context of the investment and its comparison to other markets/properties. The same cap rate may be an overall positive or a negative depending on the property it refers to. Likewise, the same property may have different cap rates at different points in your ownership of it.

Keep in mind that the cap rate calculation can hide a few important factors that could skew the results. For example, cap rate does not account for debt service, so rising interest rates or mortgage payments are not included in cap rate but nonetheless affect your property investment. Additionally, when you use cap rate to evaluate profitability before purchasing a property, you’ll need to approximate the rental rate and total expected income, which means the cap rate calculation should come after you research the rents of similar properties in your local area.

Cap rate is a valuable tool for evaluating the potential return on income-generating properties, helping investors make hard decisions about profitability and risk. While it provides a quick snapshot of a property’s performance, it’s important to consider other factors like financing and market trends to get a complete picture of the investment.

If you’re ready to analyze your potential next property, start by using Innago’s cap rate calculator real estate tool.