Investment Metrics
Gross Rent Multiplier (GRM): Formula, Benchmarks and Examples
The fastest way to compare rentals on price and rent alone, and exactly where that speed costs you.
Gross rent multiplier is the quickest comparison in rental investing: one division, two inputs, no expense estimates. That is its strength and its limit. This guide covers the formula, the benchmarks that make a GRM good or bad, how it maps onto the 1% rule, a worked example of two properties with the same GRM and very different returns, and a four-step way to use it well.
What gross rent multiplier is and how to calculate it
GRM is the property's price divided by its annual gross rent. It answers one question: how many years of rent, before any expenses, would it take to earn back what you paid.
GRM = Purchase price ÷ (Monthly rent × 12)
A $200,000 property renting for $1,800 a month has a GRM of 200,000 ÷ 21,600 = 9.26.
Calculating GRM for a $200,000 single-family rental
- Purchase price
- $200,000
- Monthly rent
- $1,800
- Annual gross rent$1,800 × 12
- $21,600
- Gross rent multiplier$200,000 ÷ $21,600
- 9.26
Use the all-in price if the property needs work, and use market rent verified against nearby leases rather than the figure in the listing. Both adjustments move GRM more than any other input.
What counts as a good GRM
A good GRM is one below the typical GRM for comparable properties in the same market. Absolute ranges still help you place a market, because rent-to-price ratios fall as prices rise.
| GRM range | What it usually means | Where it is common |
|---|---|---|
| 4 to 7 | Very high gross yield; check condition and location | Rural areas, distressed inventory, some Section 8 rentals |
| 7 to 10 | Strong cash flow potential | Midwest and Southern cash flow metros, small multifamily |
| 10 to 14 | Balanced; cash flow depends on financing and expenses | Balanced and growth metros |
| 14 and above | Appreciation thesis; thin or negative cash flow | Coastal and high-demand metros |
Property type matters as much as geography. Duplexes and fourplexes stack several rents on one price and usually trade at a lower GRM than single-family houses on the same street, so compare within type.
GRM and the 1% rule are the same test
The 1% rule asks for monthly rent of 1% of price. That is 12% a year, and a price divided by 12% of itself is a GRM of 8.33. Every rent-to-price threshold has a GRM twin.
| Monthly rent-to-price | Annual rent-to-price | Equivalent GRM | Typical use |
|---|---|---|---|
| 2.0% | 24% | 4.17 | The 2% rule; rarely met today |
| 1.0% | 12% | 8.33 | The 1% rule; cash flow markets |
| 0.8% | 9.6% | 10.42 | Balanced markets |
| 0.7% | 8.4% | 11.90 | Costly metros, appreciation thesis |
| 0.5% | 6% | 16.67 | Coastal metros |
Pick whichever framing you find easier to read off a listing. Investors who think in years tend to use GRM; investors who think in monthly rent use the ratio. The screen is identical.
The blind spot: same GRM, different returns
GRM cannot see expenses, and expenses are where rentals differ most. Two houses at the same price and rent have the same GRM, and can earn wildly different amounts once taxes, insurance and dues are counted.
Property A: $180,000, $1,800 rent, GRM 8.33, low taxes
- Annual gross rent
- $21,600
- Property taxes
- −$2,000
- Insurance
- −$1,200
- Vacancy (5%)
- −$1,080
- Maintenance (8%)
- −$1,728
- Management (8%)
- −$1,728
- Net operating incomeA 7.7% cap rate on $180,000
- $13,864
Property B: $180,000, $1,800 rent, GRM 8.33, high taxes plus an HOA
- Annual gross rent
- $21,600
- Property taxes
- −$5,400
- Insurance
- −$1,200
- HOA dues
- −$2,400
- Vacancy (5%)
- −$1,080
- Maintenance (8%)
- −$1,728
- Management (8%)
- −$1,728
- Net operating incomeA 4.5% cap rate on $180,000
- $8,064
How to use GRM well
GRM earns its place at two moments: sorting a long list of listings, and checking whether a price is in line with what the rent supports. Four steps keep it in that lane.
Establish the market baseline
Calculate GRM for six to ten comparable rentals that sold recently in the same area and property type. The median is your benchmark; a listing well below it deserves a look.Screen new listings in seconds
Divide price by verified annual rent. Above the baseline, move on. Below it, investigate why, because a cheap GRM is either an opportunity or a problem the ratio cannot see.Back into a value from rent
Value ≈ annual gross rent × market GRM. A property renting for $1,650 a month in a market at a GRM of 8.5 supports a price near $168,300, which is a useful check on an asking price.Finish with expense-aware metrics
Run cap rate and cash-on-cash return on the survivors with real tax, insurance and HOA figures.
Every one of those steps depends on a rent figure you trust. An estimate built from nearby comparable leases, with a range around it, is the input that makes GRM worth anything.
Example uses public listing data for illustration. See disclaimer.
Screening a whole market at once
Dividing price by rent for one listing is easy. Doing it for every listing in a ZIP code, with a rent estimate that is not the agent's guess, is where investors give up and start trusting hunches.
A market scan does the division for the entire ZIP: rent estimated from nearby comparables, then GRM and rent-to-price shown on every card beside cap rate and cash-on-cash, with the list ranked by return.
Example uses public listing data for illustration. See disclaimer.
Frequently asked questions
What is a good gross rent multiplier?
Lower is better, and the benchmark is the market, not a universal number. Midwest and Southern cash flow markets commonly trade at a GRM of 6 to 9, balanced metros at 9 to 12, and appreciation and coastal markets at 12 to 18 or more. A property below the typical GRM for its own market and property type is worth a closer look.
How is GRM different from cap rate?
GRM uses gross rent and ignores every expense; cap rate uses net operating income after taxes, insurance, vacancy, maintenance and management. GRM takes two numbers and ten seconds. Cap rate takes a full expense estimate and tells you what the property actually earns before financing.
Does GRM include vacancy?
No. GRM divides price by annual gross scheduled rent, which assumes the property is full all year at market rent. That is one of the reasons two properties with the same GRM can earn very different returns.
How does GRM relate to the 1% rule?
They are the same test written two ways. Rent of 1% of price a month is 12% a year, and price divided by 12% of itself is a GRM of 8.33. The 2% rule is a GRM of 4.17; a 0.7% ratio is a GRM of 11.9.
Can I use GRM to estimate a property's value?
Yes, as a first pass. Multiply the property's annual gross rent by the typical GRM of comparable rentals in the same market: $19,800 of rent at a market GRM of 8.5 implies a value near $168,000. Appraisers use the same approach for small rentals alongside sales comparables.
Keep reading
The 1% Rule in Real Estate
GRM's monthly cousin, with a worked example of passing the screen and losing money.
Read articleCap Rate Calculator
The metric that adds expenses back in, with a step-by-step example.
Read articleCash Flow vs Cap Rate
Which return metric answers which question.
Read articleHow to Estimate Rent for an Investment Property
GRM is only as good as the rent figure. Here is how to get it right.
Read articleRead GRM off every listing in a market
Smart Rental Investor estimates rent for each listing in a ZIP code from nearby comparables, then shows GRM, rent-to-price, cap rate and cash-on-cash on every card, ranked by return. The screen and the follow-up analysis, in one pass.
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