Gross rent multiplier (GRM) compares a property sale price with gross rent before vacancy and operating expenses. In common one-to-four-unit appraisal usage, GRM is sale price divided by gross monthly rent. A $360,000 sale with $3,000 of monthly rent has a GRM of 120.
Some investment discussions divide price by annual gross rent and still call the result GRM; that same example produces 10. Annual-income multiples are also described as gross income multipliers. The figures are not interchangeable. Always state the rent period and use the same convention for the subject and comparable sales.
GRM is a quick market screen, not a property return. It ignores expense differences, vacancy, concessions, condition, financing, and capital work. A low multiple can reflect opportunity, unusually high rent, or costs and risks that the gross figure cannot see.
A comparable-sale artifact
Suppose three genuinely comparable sales have monthly GRMs of 116, 121, and 124 after checking the rent and sale terms. If the subject has supportable gross monthly rent of $3,100, those observations imply rough values of $359,600, $375,100, and $384,400 before reconciliation. That range is evidence to investigate, not an appraisal produced by averaging three numbers.
Confirm whether rent is actual, market, furnished, subsidized, concession-adjusted, or burdened by unusual included services. A seller concession can also distort the sale price used to extract the multiple. The Appraisal Foundation warns that concessions can mislead GRM extraction when their effect is not measured.
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Match property type, location, condition, rent basis, and sale conditions.
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Use the same monthly or annual convention on every row.
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Follow the screen with NOI, expense, condition, and financing analysis.
GRM versus cap rate
GRM uses gross rent and sale price. Cap rate uses net operating income and value. Two properties can share a GRM while one has owner-paid utilities, high insurance, or deferred maintenance that materially lowers NOI. Cap rate requires more evidence but exposes operating-cost differences that GRM deliberately omits.
A small landlord can use GRM to triage a set of similar listings or check an appraisal discussion. It should not set rent, prove value, or replace an inspection and complete underwriting.
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Written and maintained by the Aptoria editorial team
Editorial method reviewed July 28, 2026. Aptoria reviews scope, source fit, examples, limitations, links, and publication gates. This record does not claim attorney, CPA, lender, appraiser, or other independent professional sign-off.
Related terms
Investing metrics
Capitalization rate (cap rate)
Capitalization rate is annual net operating income divided by a stated property price or value, expressed as a percentage.
Investing metrics
Net operating income (NOI)
Net operating income is effective property income minus normalized property operating expenses, before debt service and owner-level income taxes.
Investing metrics
The 1% rule
A rough rule of thumb that a rental's monthly rent should be at least 1% of its total purchase price.
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