About the Gross Rent Multiplier Calculator
The gross rent multiplier (GRM) is one of the fastest ways to size up an income property: it tells you how many years of gross rent the purchase price represents. This GRM calculator divides the asking price by the property’s gross annual income — rent plus other income like parking or laundry — and compares the result with the typical GRM for similar properties in your area.
Enter a market GRM from recent comparable sales and the calculator estimates what the property is worth on that basis, how far the asking price is above or below it, and the rent the property would need to justify the price. It is ideal for quickly screening a long list of small multifamily listings before you spend time on a full cash flow or cap rate analysis.
GRM ignores vacancy and operating expenses, so two buildings with the same GRM can have very different profits. Use it to compare similar properties in the same market, then confirm promising deals with a cap rate or rental property analysis.
With the default inputs, the gross rent multiplier is 9.52. Change any value above to recalculate instantly.
How to use the gross rent multiplier calculator
- 1Enter the asking price or estimated value.
- 2Enter the total gross monthly rent for all units at current or market rents.
- 3Add any other monthly income such as parking or laundry.
- 4Enter the GRM that similar properties nearby have sold for.
- 5Compare the GRM and implied value with the price to decide if the deal is worth a deeper look.
Formula and method
Gross annual income is twelve months of scheduled rent plus other income, before vacancy or any expenses. Dividing the price by that income gives the gross rent multiplier — the number of years of gross income the price represents. A lower GRM means more income per dollar of price.
To value a property, multiply its gross annual income by the GRM that comparable properties have recently sold at. Reversing the formula gives the income a property needs to justify its price at the market GRM. Some investors quote a monthly GRM (price ÷ monthly rent), which is simply twelve times larger. The reciprocal of the annual GRM is the gross yield.
- GRM
- Gross rent multiplier
- P
- Price or market value
- GAI
- Gross annual income = (monthly rent + other income) × 12
Worked examples
$400k fourplex renting for $3,500 a month
Gross income is $3,500 × 12 = $42,000, so the GRM is $400,000 ÷ $42,000 = 9.52. At a market GRM of 9 the property is worth about $378,000, $22,000 below the price; it would need about $3,704 a month to justify $400,000.
Duplex with parking income
Rent plus parking is $3,050 a month, or $36,600 a year, for a GRM of 9.02. Comparable duplexes selling at a GRM of 10 imply a value of $366,000, so the $330,000 price looks $36,000 cheap on a gross-income basis.
Expensive market with a high GRM
Income of $81,600 a year on a $1.25M price is a GRM of 15.32. In a market where comparables trade near 16, that implies about $1.31M of value — typical of high-cost areas, where the gross yield is only about 6.5%.
Frequently asked questions
What is a good gross rent multiplier?+
There is no universal good GRM; it depends on the local market. As a rough guide, lower GRMs (often 4–8) are found in cheaper, higher-yield markets and higher GRMs (12–20+) in expensive coastal cities. Compare against recent sales of similar properties nearby.
How do you calculate the gross rent multiplier?+
Divide the property price by its gross annual rental income. A $400,000 property that brings in $42,000 a year in rent has a GRM of 400,000 ÷ 42,000 = 9.52.
What is the difference between GRM and cap rate?+
GRM uses gross income and ignores vacancy and expenses, so it is quicker but rougher. Cap rate uses net operating income after expenses, so it reflects how profitable the property really is. Use GRM to screen and cap rate to decide.
Should GRM use annual or monthly rent?+
Most investors and appraisers use annual gross income, but some markets quote a monthly GRM, which is price divided by monthly rent. A monthly GRM of 114 is the same as an annual GRM of 9.5, so always check which one a figure uses.
Why can two properties with the same GRM perform differently?+
GRM does not account for operating costs. A building where tenants pay utilities, or with a newer roof and lower taxes, will produce more net income than an older building with the same rent and price, so its true return is higher.
Results are estimates for educational purposes and are not financial advice. Rates, fees and terms vary — confirm with your lender or a licensed advisor before making decisions.