Gross Rent Multiplier (GRM) explained
GRM is calculated by dividing the property price by the gross annual rental income, without deducting any operating expenses. Because it uses gross rent rather than net operating income, it is rougher than cap rate but very fast to compute, making it useful for an initial comparison of many listings at once.
In Canada, GRM is best used to compare similar properties in the same market, since expense ratios and rents vary by area and building type. A property with a low GRM may look attractive, but investors should follow up with a full analysis, because GRM ignores property tax, vacancy, maintenance, and financing entirely.