Gross Rent Multiplier (GRM)
Gross Rent Multiplier (GRM) estimates property value for rentals. Discover how GRM uses annual rent to evaluate investment properties quickly.
Definition
The gross rent multiplier (GRM) is a simple metric investors use to estimate the value of an income‑producing property relative to its gross rental income. It’s calculated by dividing the property’s purchase price by its gross annual rent. For example, if a duplex sells for $300,000 and generates $30,000 per year in rent, the GRM is 10. Lower GRMs suggest a property may be undervalued or yield higher returns, while higher GRMs indicate lower cash flow relative to price. GRM is a quick screening tool but doesn’t account for operating expenses, vacancy, or financing costs; investors should also analyze net operating income, cap rates, and cash‑on‑cash returns.
Why It Matters
GRM is a sorting tool, not a valuation. It tells you how many years of gross rent equal the price, which is useful for cutting 40 listings down to 6 in an afternoon and useless for deciding whether to buy any of them. Two buildings with identical GRMs can differ by $9,000 a year once you count a $600 HOA fee, a 1978 furnace, and a city rental inspection program.
Examples
A Spokane fourplex at $640,000 collecting $5,600 a month has $67,200 in gross annual rent and a GRM of 9.5.
A Seattle duplex at $850,000 renting for $4,200 a month carries a GRM of 16.9, which says the price is tracking land value rather than cash flow.
An investor screens 32 listings, keeps the 7 below a GRM of 11, runs full net operating income on those, and finds 2 that survive taxes, insurance, and 6% vacancy.
Tips
Calculate GRM from the actual rent roll, not the seller's pro forma market rent. The gap between those two numbers is where bad deals hide.
Build a baseline for your own submarket by running GRM on ten recent sold comps. A GRM of 12 is cheap in one city and expensive in the next.
Do not compare GRM across buildings with different expense structures. Owner-paid water, sewer, and garbage changes the real return without changing the multiplier at all.
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