The gross rent multiplier is the fastest screen in rental property: the price divided by the annual gross rent. A property at 240,000 renting for 1,600 a month has a GRM of 12.5 — you are paying twelve and a half years of gross rent for it. This calculator works in three directions. Forward, it gives the GRM and the equivalent gross yield from a price and a rent. In reverse, it prices a property from a target GRM (what should you offer for this rent, in this neighbourhood?), and it solves for the rent a price requires at a given GRM (what must this place actually achieve before the numbers even start?).
How to read a GRM
GRM is a price tag expressed in years of rent, and it is only meaningful compared with other properties in the same market at the same moment. In a market where similar homes trade at a GRM of 10, a listing at 14 is expensive no matter how glossy the photos; in a market trading at 15, the same listing is unremarkable. The gross yield shown beside it is the same information inverted — a GRM of 12.5 is a gross yield of 8.00%, a GRM of 10 is 10%, a GRM of 20 is 5% — which is why some investors screen by yield and others by multiplier. They are one division apart.
The three modes, worked
GRM mode: 240,000 price, 1,600 a month rent — annual rent 19,200, GRM 12.50, gross yield 8.00%. Price mode: a flat renting for 1,500 a month (18,000 a year) in a street where deals close at a GRM of 10 is worth about 180,000 at that standard; offer far above it and you are betting on rent growth or resale, not on the rent. Rent mode: a 300,000 purchase that must hit a GRM of 12 needs 25,000 a year — 2,083.33 a month. If the realistic market rent is 1,900, the deal fails its own screen before you have spent a cent on surveys.
What GRM deliberately leaves out
Everything after the gross rent: vacancy, taxes, insurance, community fees, maintenance, management. A low-GRM property with brutal service charges can return less than a higher-GRM one with modest costs, and GRM cannot see the difference. It also cannot see the rent’s reliability — a GRM built on a fantasy asking rent is a fantasy ratio. Use it the way agents and experienced landlords actually use it: as a thirty-second filter that kills obviously mispriced listings and flags the rest for the real analysis — net yield, cap rate, and a month-by-month cash flow with the mortgage in it. If a property survives the GRM screen, it has earned the ten minutes those tools take.
Rules of thumb that lean on GRM
The old “1% rule” — monthly rent should be at least 1% of the price — is a GRM in disguise: rent of 1% a month is 12% a year, a GRM of 8.33. Markets where properties trade near that level are usually cash-flow markets; expensive coastal and capital-city markets often sit at a GRM of 18 to 25, where rent alone never justified the price and the buyer’s real bet is appreciation. Neither end is automatically wrong, but they are different investments wearing the same clothes, and confusing one for the other is how yield-chasers end up owning appreciation bets. Knowing the local GRM range — compute it for ten recent sales or listings in the same streets — tells you which game a given property is asking you to play, and whether its price belongs to that game at all.
Related tools
Versión en español: Calculadora del Multiplicador del Alquiler Bruto (GRM) Inmobiliario: Precio entre Renta Anual y Yield Bruto · Cap Rate Calculator · Net Rental Yield Calculator.
Embed this tool on your website — free
Copy the code below to add this working tool to your own page. A small credit link stays with it — that’s all we ask.