Gross Rent Multiplier or "GRM" is the ratio of the price of a real estate investment to its annual rental income before expenses:
总租金系数,或 “GRM" 是 投资房产的价格除以年总（毛）租金的比率.
Gross Rent Multiplier (GRM) = Sale Price / Potential Gross Income
GRM = 房产销售价/ 年总租金