Free Tool
Gross Rent Multiplier Calculator
Free GRM calculator. Enter the price and monthly rent to get the gross rent multiplier, the price implied by a market GRM, and a side-by-side cap rate so you can see what the multiple leaves out.
| Gross annual rent (monthly rent × 12) | — |
| Market GRM entered | — |
| Net operating income (rent after vacancy − operating costs) | — |
| Vacancy + operating costs as % of gross rent | — |
Assumptions: GRM = price ÷ gross annual rent (monthly rent × 12, before vacancy). Implied price = gross annual rent × market GRM. Cap rate = (gross rent after vacancy − operating costs) ÷ price. GRM ignores expenses and financing; no income tax or rent growth are modeled. Estimates only, not financial advice.
How the gross rent multiplier works
The gross rent multiplier (GRM) is the simplest price-to-rent measure in real estate: price ÷ gross annual rent. A property that costs $200,000 and brings in $21,600 a year in scheduled rent has a GRM of about 9.26: you pay roughly $9.26 for every $1 of annual rent. All else equal, a lower GRM means more rent for your money.
Because you need only two numbers, GRM is a fast screen. It works in two directions:
- Price to GRM: divide the asking price by gross annual rent to see where the property sits.
- GRM to price: multiply gross annual rent by a market GRM (what similar properties nearby sell for as a multiple of rent) to get an implied value. This calculator does both.
Worked example using the calculator defaults
The calculator loads with a $200,000 asking price, $1,800 monthly rent, a market GRM of 10, 5% vacancy and $6,000 a year of operating costs (for example $2,400 tax, $1,200 insurance and $2,400 of maintenance and management). Rounded to the nearest dollar:
- Gross annual rent: $1,800 × 12 = $21,600.
- GRM: $200,000 ÷ $21,600 = 9.26×, a little below the 10× market figure.
- Implied price at the market GRM: $21,600 × 10 = $216,000, which is $16,000 above the asking price.
- NOI: $21,600 less 5% vacancy ($1,080) = $20,520, minus $6,000 of operating costs = $14,520.
- Cap rate at the asking price: $14,520 ÷ $200,000 = 7.26%.
- Cap rate at the market-GRM price: $14,520 ÷ $216,000 = 6.72%.
The takeaway: the GRM says the property is priced slightly below the local multiple, and the cap rate shows what you would actually earn on that price after vacancy and expenses. The gap between the two is why GRM should be a first screen, not a decision.
GRM vs cap rate
| Metric | Formula | Uses expenses? | Best for |
|---|---|---|---|
| GRM | Price ÷ gross annual rent | No | Fast comparison of many listings; sanity-checking a price |
| Cap rate | NOI ÷ price | Yes | Comparing properties on income after operating costs |
Two buildings with the same GRM can have very different cap rates: an older building with high taxes and maintenance costs earns less of each rent dollar than a newer one. GRM also ignores financing entirely. For the next step see the cap rate calculator, then the rental property ROI calculator for cash flow after a mortgage.
Using GRM carefully
- Compare like with like. Use a market GRM from similar properties in the same area, size and condition, not a national rule of thumb.
- Use actual or realistic rent. Overstated rent makes a property look cheaper than it is.
- Remember what it skips. Vacancy, taxes, insurance, repairs and management are all ignored, which is why expense-heavy properties can look better on GRM than they deserve.
- Treat the implied price as a range, not a valuation. It is arithmetic on comparables, not an appraisal.
Frequently asked questions
What is the gross rent multiplier?
The gross rent multiplier (GRM) is the purchase price divided by gross annual rent. A property priced at $200,000 that rents for $21,600 a year has a GRM of about 9.26. Lower multiples mean you pay less for each dollar of rent.
How do I use a market GRM to estimate a property's value?
Multiply the property's gross annual rent by the typical GRM for similar properties nearby. If comparable properties sell at about 10 times annual rent and your property rents for $21,600 a year, the implied value is about $216,000. It is a rough cross-check, only as good as the comparables behind the market GRM.
What is a good GRM?
There is no universal answer. GRMs vary widely by market and property type: expensive, lower-yield markets often show higher multiples, while cheaper, higher-yield markets show lower ones. Compare a property only against similar properties in the same area, and treat any general range as a reference point, not advice.
What is the difference between GRM and cap rate?
GRM compares price with gross rent and ignores vacancy and operating costs. Cap rate is net operating income divided by price, so it reflects expenses. Two properties with the same GRM can have very different cap rates if one has much higher taxes, insurance or maintenance costs.
Why is GRM useful if it ignores expenses?
It is quick: you need only a price and a rent, so it is a fast way to compare many listings or sanity check a price against local norms. Its weakness is the same simplicity, so it works best as a first screen before you run cap rate, cash flow and cash-on-cash numbers.
Does the GRM calculator include a monthly or annual rent?
Enter monthly rent; the calculator multiplies it by 12 to get gross annual rent before dividing. Gross rent here means scheduled rent before vacancy, which is how GRM is conventionally defined.
Related rental property calculators
- Rental Property ROI Calculator — the hub: cash flow, cash-on-cash, cap rate, total ROI and the 1% rule in one place.
- Cash-on-Cash Return Calculator — annual cash flow divided by the cash you actually invested.
- Cap Rate Calculator — net operating income divided by price, independent of financing.
- Rental Property Cash Flow Calculator — monthly income, expenses, mortgage, break-even rent and DSCR.
- 1% Rule Calculator — a 10-second screen of rent against price.
- BRRRR Calculator — buy, rehab, rent, refinance: cash left in the deal and post-refi cash flow.
- DSCR Calculator — debt service coverage ratio and the maximum loan a rental can support.
- Airbnb vs Long-Term Rental Calculator — compare short-stay income to a standard lease.
- Rental Income & Expense Spreadsheet and Rental Property Expense Tracker — track the real numbers once you own the property.
- Free Simple Rental Property Analysis spreadsheet — a one-property deal analyzer for Excel and Google Sheets, no signup.
Want the full system, not just this one number?
This calculator screens one deal at a time. The Rental Property Manager Toolkit tracks rent, expenses, tenants, and maintenance across up to 8 properties, with a dashboard that shows real cash flow and net income as they actually happen — not just projected at purchase.
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