Gross Rent Multiplier (GRM): A Quick Deal Screen

What Is Gross Rent Multiplier?

GRM is the ratio of a property’s purchase price to its gross annual rental income. It tells you how many years of gross rent it would take to pay back the purchase price, before any expenses. A GRM of 8 means the price equals eight years of gross rent.

Because GRM uses gross income and ignores operating expenses, debt service, and taxes, it is a rough screen rather than a measure of return. Two properties with the same GRM can produce very different cash flow if one carries high expenses and the other does not.

GRM = Purchase Price ÷ Gross Annual Rent

Why GRM Is Useful

GRM is useful because it is fast. You can compute it from a listing’s price and rent estimate in seconds, which makes it a good first-pass screen to rule out obviously overpriced deals before you invest time in a full underwriting.

It is most valuable for comparing similar properties in the same submarket, where expense ratios are likely to be comparable. Used that way, a GRM far above the local norm flags a deal that deserves a closer look, or a pass.

The Formula and Each Variable

• Purchase Price: the all-cash price you pay for the property.
• Gross Annual Rent: total scheduled rent for the year at full occupancy, before vacancy and before any expenses. Some practitioners use gross scheduled rent only; others add other income. Pick one definition and apply it consistently.

GRM ignores expenses entirely. A low GRM looks cheap but can still lose money if the property carries high taxes, insurance, or maintenance. Always follow a GRM screen with a full cash flow analysis.

Worked Example: Calculating GRM

The following hypothetical example uses annual figures. The numbers are illustrative only.

A GRM of about 8.5 means the price equals 8.5 years of gross rent. Whether that is attractive depends on the local norm. If comparable properties in the submarket trade at GRMs around 10, this deal looks relatively well-priced on the screen. If comps trade around 7, it looks expensive.

What GRM Does Not Tell You

GRM excludes every cost that actually determines whether a deal works.

• Operating expenses: taxes, insurance, management, maintenance, utilities.
• Vacancy and credit loss.
• Capital expenditures and reserves.
• Debt service and financing terms.

Because of these exclusions, GRM should never be the metric that decides a purchase. Use it to rank or filter deals quickly, then run a full cash flow, cap rate, cash-on-cash, and DSCR analysis on anything that passes the screen.

GRM vs. Cap Rate

GRM and cap rate are related but answer different questions, and cap rate is the stronger metric because it accounts for expenses.

• GRM: price ÷ gross rent. Ignores expenses. Fast screen.
• Cap rate: NOI ÷ price. Accounts for operating expenses. Better comparison metric.

A property with a low GRM (looks cheap) can have a poor cap rate if expenses are high. Cap rate is the metric to trust for comparison; GRM is the metric to use for speed.

When GRM Misleads

• Across markets with different expense ratios, because GRM ignores expenses entirely.
• On properties with below-market rents, where a low GRM reflects current rent rather than achievable rent.
• On properties with significant deferred CapEx, since GRM does not account for upcoming capital needs.
• When gross rent definitions differ, mixing gross scheduled rent with rent plus other income distorts comparisons.

Practical Use

• Use GRM to screen a list of listings down to a few worth underwriting.
• Compare GRM only within the same submarket and property type.
• Always follow the screen with a full cash flow and cap rate analysis.
• Treat a GRM that looks too good as a warning to check expenses and deferred maintenance, not as a bargain.

Frequently Asked Questions