Investing in Real Estate? How to Value Rental Property

2. Gross rent multiplier (GRM) approach

The gross rent multiplier (GRM) approach is a method for valuing rental properties based on their potential rental income. It can also give you a rough idea of how many years it would take for the property’s gross rental income to cover its purchase price.

Calculate the GRM by dividing the property’s price by its annual gross rental income. Generally, a lower GRM can point to a more attractive investment because it means the property’s price is lower relative to its rental income. Just keep in mind that GRM is best used as a quick screening tool since it doesn’t factor in expenses like taxes, insurance, utilities, or maintenance.

Gross rent multiplier approach example scenario

Suppose you’re evaluating a rental property priced at $450,000, with an annual gross rental income of $60,000. To calculate the GRM, divide the property’s price by the annual rental income:

Property Value / Annual Gross Rental Income = GRM

$450,000 / $60,000 = 7.5

Next, compare this GRM with the GRMs of similar properties in the area. If comparable properties have GRMs of around 8 or higher, the property you’re considering may be a good investment. Conversely, if other properties have significantly lower GRMs, you might want to reconsider or negotiate a lower purchase price.

3. Income approach

The income approach values a rental property based on how much income it can generate, making it a popular choice for investors who are focused on cash flow. This approach evaluates a property’s net operating income (NOI) and the capitalization rate (cap rate) to estimate its value. The NOI is the annual income from the property after subtracting operating expenses, while the cap rate represents the expected rate of return on the investment.

This method works especially well for properties with steady, predictable income, such as apartment buildings and commercial real estate. It also lets investors compare properties based on their potential returns, making it easier to decide where their money might be best spent.

Income approach example scenario

Consider you’re evaluating a rental property priced at $140,000. It generates $1,750 in monthly rent, or $21,000 annually. After accounting for operating expenses such as property taxes, insurance, maintenance, and management fees, the annual NOI comes to $16,800.

NOI of $16,800 / $140,000 = 0.12 or 12%

In the local market, similar properties at the same price have a capitalization rate of only 10%. 

NOI of $14,000 / $140,000 = 0.1 or 10%

This approach provides you with a clearer picture of the property’s income-generating potential relative to its value. In this example, the first property may be a worthwhile investment.

4. Cost approach

The cost approach estimates a property’s value based on what it would cost to replace or rebuild it. Basically, imagine the property were destroyed completely: how much would it cost to build a similar one from scratch today? The calculation factors in the current cost of construction, the value of the land, and any depreciation the existing property has accumulated.

This method works best for newer properties or homes with major recent upgrades since it relies on current construction costs and depreciation estimates. For older properties, figuring out depreciation can be trickier, so the results may be less reliable. Still, the cost approach can be helpful for special-use properties, such as schools, churches, or public buildings, where there may not be many comparable properties to reference.

Cost approach example scenario

Suppose you’re evaluating a newly built rental property. The land is valued at $100,000, and the construction cost of the building is $350,000. If the building has not depreciated, the property’s value is the sum of the land and construction costs:

Property Value = Land Value + Construction Cost

$100,000 + $350,000 = $450,000

If the building has depreciated by $50,000, the adjusted value would be:

Adjusted Property Value = Property Value – Depreciation

$450,000 – $50,000 = $400,000

The cost approach aims to give investors a realistic idea of what a property is worth based on what it would cost to replace. This can help you see whether the asking price makes sense given the property’s current condition and potential use.

5. Other options: From complex to automated

In addition to the traditional valuation methods, there are other options that can provide investors with deeper insights or quicker estimates. Two such methods are the capital asset pricing model (CAPM) and rental property calculators.

Capital asset pricing model (CAPM)

The capital asset pricing model (CAPM) is a more complex method used to determine the expected return on an investment property. This approach takes into account the risk-free rate of return, the expected market return, and the property’s beta, which measures how its volatility compares with the broader market. 

In simple terms, CAPM asks, “Given how risky this investment is, what kind of return would make it worth it?” A riskier property would generally need to offer a higher expected return to justify taking on that additional risk. This makes CAPM useful for investors who want to weigh a property’s potential return against the risk they’re taking on.

For example, if the risk-free rate is 2%, the expected market return is 8%, and the property’s beta is 1.2, the expected return can be calculated as follows:

Expected Return = Risk-Free Rate + Beta * (Market Return – Risk-Free Rate)

Expected Return = 2% + 1.2 * (8% – 2%) = 9.2%

This approach can help investors evaluate whether a property offers a return that justifies its risk compared to other investment opportunities.

Rental property calculators

Rental property calculators are automated tools that can quickly estimate a property’s value and potential return based on inputted data. These calculators typically require information such as purchase price, rental income, expenses, loan details, and vacancy rates. By inputting these details, investors can get an instant snapshot of a property’s financial performance.

For instance, an online rental property calculator might ask for:

• Purchase price: $400,000
• Down payment amount: $80,000
• Monthly rental income: $2,400
• Insurance: $1,200 annually
• Property tax rate: 1%
• Appreciation rate: 2.5
• Other expenses: $220 a month
• Loan details: $320,000 loan with 6.8% interest

The calculator will then provide metrics like cash flow, cap rate, and ROI, helping investors quickly assess whether a property meets their investment criteria.

Examples of rental property calculators

• Calculator.net Rental Property Calculator
• Avail Rental Property Calculator
• TurboTenant Rental Property Calculator
• Calculator Academy Rent To Value Calculator
• SoFi Rental Property Calculator
• Apartments.com Rental Property Calculator

Common mistakes to avoid in rental property valuation

Even with the right valuation method, it’s easy to get the numbers wrong when you’re sizing up a rental property. Watch out for these common mistakes that can lead you to overestimate a property’s potential and make a costly investment decision. 

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Find a good rental property with a top agent

Many first-time investors will take a low-risk step into the investment pool by buying a second home and renting their first. If you’re looking for a rental property with a solid ROI, having the right real estate agent in your corner can make the process easier. A knowledgeable agent can help you understand the local market, evaluate potential properties, and feel more confident about your investment decisions.

HomeLight can connect you with top-performing agents who know the local market and have a track record of successful transactions. With the right expert by your side, you can make smarter decisions and feel more confident about where you’re putting your money.

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Editor’s note: This post is for informational purposes only and isn’t meant to be investment advice. If you’re considering an investment, it’s always a good idea to talk with a qualified advisor.