Sometimes it is very easy to tell if one rental property will be a better investment over another. However, it gets a lot trickier when both properties appear to be equal on the surface. For these situations, veteran CRE investors and newcomers both turn to the gross rent multiplier or GRM — a financial metric that can help you select the best rental property to invest in and even keep track of the real-time financial performance of a property you already own.

What Is the GRM?

The gross rent multiplier is a formula that can help you determine the potential profitability of a property, so you can compare similar properties and more accurately determine which one may make the better CRE investment. It's especially useful when there's a lot of fluctuation in the market, with rents changing rapidly.

How Is the Gross Rent Multiplier Calculated?

Gross Rent Multiplier = Property Price or Value / Gross Rental Income

Example: a four-unit multifamily property generating gross annual rent of $57,600, with an asking price of $400,000. GRM = $400,000 / $57,600 = 6.94.

What Is a Good GRM?

It's all about comparison — most investors say the lower the GRM compared to similar properties in the same market, the better the investment probably is. A lower GRM means the property is generating more gross income, faster, relative to other CRE assets.

Other Uses for the GRM

If you know at least two of the three variables, you can determine the third:

  • Gross Rent Multiplier = Property Price / Gross Rental Income
  • Gross Rental Income = Property Price / Gross Rent Multiplier
  • Property Price = Gross Rental Income × Gross Rent Multiplier

Example: with a market GRM of 8.2 and an asking price of $550,000 → Gross Rental Income = $550,000 / 8.2 = $67,073.

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How the Gross Rent Multiplier Differs From the Cap Rate

The gross rent multiplier estimates value based on gross rental income; the cap rate calculates value based on net operating income (NOI). NOI doesn't include mortgage payments — only regular operating expenses — while the cap rate excludes debt service to allow more accurate comparisons across investors using different amounts of leverage.

How to Calculate the Capitalization Rate

Using the 50% rule (50% of gross income goes to operating expenses): a property with $75,000 annual gross rental income has an NOI of roughly $37,500. Cap rate = $37,500 (NOI) / $500,000 (property value) = 7.5%. Just like the GRM, cap rate needs to be compared against other properties — a higher cap rate is generally better, since potential return is higher.

GRM vs. Cap Rate — A Worked Example

Before a 6% rent increase: GRM = $400k / $53,333 = 7.5; Cap rate = $26,667 / $400k = 6.7%.
After the increase: GRM = $400k / $56,533 = 7.087; Cap rate = $28,267 / $400k = 7.1%.

How to Apply the Gross Rent Multiplier

Compare two similar properties with comparable market value — whichever has the lower GRM offers the best value, since the gross rental stream is greater. If you own a rental property, use the GRM to monitor changes based on gross rent collected: a lower GRM than a neighboring similar property suggests your property manager is collecting payments on time and keeping turnover low. A higher GRM might mean high turnover, late collections, or rent that needs raising.

Pros and Cons of the Gross Rent Multiplier

Pros: simple calculation for comparing multiple similar properties; easy formula for new investors; solid screening tool; focused on actual rental income rather than just building value; usable by both seller and buyer.

Cons: doesn't account for operating expenses; sellers may use a low GRM to mask costly deferred maintenance; buyers may overlook deferred maintenance in favor of a low GRM and end up paying out of pocket for repairs; doesn't factor in vacancy costs; doesn't measure time to pay off a property (a common misconception).

When using the GRM, it's important to recognize what it does and doesn't do — as long as you're aware of its limitations, it's extremely useful for its speed and utility, though it's not the end-all when determining whether a property is a good investment.