Gross Rent Multiplier (GRM) is a simple ratio used to screen rental properties quickly. It tells you how many years of gross rent it would take to pay off the purchase price, assuming zero expenses — which is why it is a screening tool, not a valuation tool. Despite its limitations, GRM is widely used for rapid deal filtering before doing deeper analysis.
GRM Formula
GRM = Property Price / Annual Gross Rent
A property listed at $360,000 that rents for $2,500/month ($30,000/year) has a GRM of 12. The lower the GRM, the more rent you are getting per dollar of purchase price. Use the GRM Calculator to compare multiple properties side by side in seconds.
How to Use GRM to Screen Deals
GRM is most useful for quickly eliminating overpriced properties in a market where you know the going GRM. If comparable rentals in your target market trade at GRM 10–12, a property asking GRM 18 is priced significantly above the local norm, which is a red flag without a clear justification. Conversely, a property at GRM 8 in that same market warrants immediate further investigation.
GRM Benchmarks by Market Type
There are no universal GRM targets — they are entirely market-specific. Rural and Midwest markets often trade at GRM 5–8. Secondary cities typically range from 8–12. Major coastal metros can reach GRM 20–30 or higher in the most supply-constrained neighborhoods. Comparing GRM only makes sense against local comps in the same property class.
GRM vs Cap Rate: Key Limitations
GRM uses gross rent (before any expenses), which means two properties with the same GRM but different expense structures have very different actual returns. A property with high property taxes, an old roof, and a full-service management contract will generate far less income than its GRM suggests. Always follow up with a full cap rate and cash flow analysis before making any offer. GRM opens the door; cap rate and cash flow close the deal.