Price divided by annual rent — two numbers, both in the listing
A $300,000 property renting at $2,000 a month produces $24,000 a year and a gross rent multiplier of 12.5. Lower is cheaper relative to rent. The whole appeal is that it needs only two figures, both usually published, which makes it a filter you can run across fifty listings in an afternoon.
GRM = price / gross annual rent ; Implied value = market GRM x gross annual rent
At a market multiple of 12, the same rent implies a value of $288,000 — so this property is priced $12,000 above where the local market is trading. That gap is the actionable output: it is a negotiating position, or a reason to look elsewhere.
Every operating cost, which is most of the difference between two buildings
GRM uses gross rent, before a single expense. Two properties at the same multiple are not comparable if one pays its own heating and the other does not, or if one sits in a jurisdiction with double the property tax, or if one needs a management company and the other is next door to the owner.
That is the whole reason cap rate exists. Use GRM to decide which listings justify the effort of gathering real expense figures, then compute NOI and a cap rate on the survivors. A GRM comparison between a low-cost and a high-cost building is actively misleading, not merely imprecise.
Recent comparable sales, not an industry rule of thumb
The market GRM you enter should come from actual sales of similar properties in the same area — price divided by annual rent for each, averaged. It varies enormously by location and by property type: multiples in the high single digits are common in slower markets, and high teens or above in expensive metropolitan ones.
Applying a national or online rule of thumb defeats the purpose, because the multiple is almost entirely a function of local price-to-rent dynamics. A property at a GRM of 12.5 is cheap in one city and expensive in another, and only local comparables tell you which.
Current rent, fully let, with no capital work pending
The rent used should be actual current rent, not asking rent or a projection. A property let below market shows a high multiple that improves once rents are raised — which may be an opportunity or may reflect sitting tenants and regulation that prevents it.
GRM also ignores condition entirely. A building priced at an attractive multiple because it needs $50,000 of work is not attractively priced, and nothing in a price-over-rent ratio will reveal it.
Frequently Asked Questions
What is a good gross rent multiplier?
It depends entirely on the local market, but lower is generally better because you pay fewer years of rent for the property. Typical ranges differ widely by city and property type, so compare a GRM only against genuinely similar local properties, not a universal target.
What is the difference between GRM and cap rate?
GRM uses gross rent and ignores expenses, while cap rate uses net operating income after expenses. GRM is a faster, rougher screen; cap rate is the expense-aware metric. A property can look good on GRM but poor on cap rate if its costs are high.
Is GRM annual or monthly?
The standard gross rent multiplier uses gross annual rent. Some investors quote a monthly version, sometimes called the gross income multiplier, using monthly rent. This calculator shows both, but compare like with like when using market figures.
Why is a lower GRM better?
Because GRM is the number of years of gross rent the price represents. A lower multiple means the property costs less relative to the rent it generates, which usually points to better value, all else equal.
Can GRM mislead me?
Yes. Because it ignores operating costs, taxes, and vacancy, a low GRM property with heavy expenses can still lose money. Always confirm with cap rate and cash flow before relying on GRM alone.
How do I find a market GRM?
Divide recent comparable sale prices by their gross annual rents and look at the typical range. An agent or appraiser can help. The market GRM is only useful if the comparables are genuinely similar in type and location.
Sources & References
Figures on this page are checked against primary, authoritative sources. Links open in a new tab.
Returns are assumptions, not guarantees. Actual results may vary because of market performance, taxes, fees, inflation, and timing. This is an educational projection, not investment advice.
Published the calculator with its formula, worked example, assumptions, limitations and a bespoke guide, and added an automated formula test suite covering it.
Tested that the implied market value is annual rent times the market multiple, and that the value gap reconciles to your own price.
Frequently Asked Questions now show on the page: 6 answers, checked in a page-by-page audit.
What the calculation assumes and where it stops now show on the page.
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