JB PARCELGross Rent Multiplier Calculator
GRM is price divided by gross annual rent. It ignores expenses entirely, which makes it useless for underwriting and excellent for sorting fifty listings down to five worth real work.
How this calculator works
Gross rent multiplier is price divided by gross annual rent. A $285,000 house renting for $2,050 a month collects $24,600 a year, which is a GRM of 11.59. Lower is cheaper relative to rent.
The whole value of GRM is speed. There are no expenses to research, no tax bill to look up, no insurance quote to get. You can run it on a listing in fifteen seconds, which means you can run it on every listing in a county and rank them. That is the correct use.
The incorrect use is buying on it. Two properties at identical GRMs can be wildly different investments: one has owner-paid water and a twenty-five-year-old roof, the other is tenant-paid with new systems. GRM cannot see any of that. Once a property clears your GRM screen, move to NOI and cap rate.
Comps are what make it work. Back the local GRM out of recent sales: take the sale price and divide by what the property rented for. Same submarket, same asset type, same era of construction. A GRM comp from thirty miles away is not a comp.
Worked example: screening a list of Tennessee rentals
Four listings, thirty seconds of work each.
| Property | Price | Rent | GRM |
|---|---|---|---|
| Clarksville SFR | $285,000 | $2,050 | 11.59 |
| Memphis duplex | $210,000 | $1,900 | 9.21 |
| Franklin SFR | $625,000 | $3,100 | 16.80 |
| Jackson fourplex | $340,000 | $3,400 | 8.33 |
The Jackson fourplex and the Memphis duplex go to the underwriting pile. Franklin does not, at least not as a cash flow play. That is the entire job GRM is good at, and it took two minutes instead of two hours. Now go run NOI on the two survivors, because the Memphis duplex might have owner-paid utilities and the fourplex might need $60,000 of work.
Questions investors ask
What is a good GRM?
It is entirely local. Cash-flow markets in West Tennessee often trade in the 8 to 11 range. Growth submarkets around Nashville routinely price at 15 to 20 because buyers are paying for appreciation. There is no universal good number, only the number for your submarket, which you get from recent sales of comparable properties.
GRM or cap rate?
GRM for screening, cap rate for deciding. GRM takes seconds and needs two data points. Cap rate takes an hour and needs a real operating statement, but it accounts for taxes, insurance, management, and reserves, which is where deals actually get won or lost. Use GRM to decide what deserves the hour.
Should GRM use gross rent or collected rent?
The standard definition uses gross scheduled rent, and that is what you should use for comparisons, because it is what everyone else uses. The net multiplier shown here, which uses rent after vacancy, is a more honest number for your own decision making. Just do not mix the two when comparing to a comp.
How do I find a GRM comp?
Take recent sales of similar properties and divide the sale price by the annual rent at the time of sale. On the JB PARCEL map you can pull recent sale prices and dates for comparable parcels directly, then pair them with rent from listings or from a property manager who works the submarket. Three or four real comps beat any published average.
Does GRM work on commercial property?
Rarely, and you should not lean on it. Commercial leases vary too much in structure. A triple-net tenant pays taxes, insurance, and maintenance directly, so the same gross rent produces far more net income than it would under a full-service lease. Commercial gets underwritten on NOI and cap rate. Use GRM on residential and small multifamily where expense structures are broadly similar.
Related calculators
Screening a real property? Pull its appraised value, assessed value, acreage, land use, and last recorded sale off the JB PARCEL parcel map and drop the real numbers into this calculator instead of guessing. Coverage runs across every county we carry.