How to use this calculator
Enter the property purchase price and the total monthly rent collected (or expected). The calculator divides the price by the annual gross rent to produce the Gross Rent Multiplier. You can evaluate a single property or add multiple properties to compare them side by side.
The GRM result tells you how many years of gross rent it would take to equal the purchase price. A lower number means you are paying less per dollar of rental income, which generally indicates a better investment from a cash flow perspective.
Keep in mind that GRM uses gross rent before any expenses are deducted. Two properties with the same GRM can have very different actual returns if one has much higher taxes, insurance, or maintenance costs. Use GRM as a quick screening tool to narrow your search, then follow up with more detailed analysis using cap rate and cash on cash return for your top candidates.
What is Gross Rent Multiplier?
The Gross Rent Multiplier is calculated by dividing the property price by its annual gross rent. A property listed at $200,000 with $24,000 in annual rent has a GRM of 8.3. Lower is better for investors because it means the property is cheaper relative to its income.
Think of GRM as a rough payback period. A GRM of 10 means it would take about 10 years of gross rent to equal the purchase price (ignoring expenses). It is a quick screening tool, not a complete analysis.
Frequently asked questions
What is a good GRM?
Under 8 is strong for investors. 8 to 12 is moderate. Above 15 is typically overpriced from an investment standpoint. Ideal varies by market.
GRM vs cap rate?
GRM uses gross rent (quick and simple). Cap rate uses net operating income (accounts for expenses). Cap rate is more accurate but requires more data.
Limitations of GRM?
It ignores expenses, vacancies, maintenance, and financing. Two properties with identical GRMs can have very different actual returns. Use it for quick screening only.
How do investors use GRM?
As a quick filter. Investors set a target GRM (like under 10) to identify deals worth deeper analysis with cap rate and cash flow calculations.