Gross rent multiplier (GRM) compares a property's purchase price with its gross rental income. It is a quick way to make the price-to-rent relationship visible, but it cannot tell you how much cash the property keeps. Two properties can have the same GRM and very different operating expenses, debt payments and cash flow.
Use the Gross Rent Multiplier Calculator to enter purchase price, gross scheduled annual rent and an editable annual target. The versioned GRM methodology record records the inputs, exclusions and rounding for gross-rent-multiplier@1.0.0.
The formulas and income convention
DealYield uses annual scheduled property rent, before vacancy, collection losses, operating expenses, financing and taxes. Exclude non-rental income. Purchase price means the acquisition price itself: do not substitute current market value, after-repair value, loan principal or total acquisition cost.
- Actual annual GRM = purchase price ÷ gross scheduled annual rent.
- Implied purchase price at target = annual rent × target annual GRM.
- Required annual rent at target = purchase price ÷ target annual GRM.
- Required monthly rent equivalent = purchase price ÷ target annual GRM ÷ 12.
The California State Board of Equalization's Lesson 8 on capitalization formulas explains the price, income and multiplier relationship and its inverses. Lesson 9 on multipliers distinguishes rental income from income from all sources, potential from effective income, and notes the use of monthly as well as annual periods. These sources support the explanatory math. DealYield does not apply California assessment rules or tax treatment.
Annual scheduled rent is this product's explicit convention, not the only convention used in appraisal. Compare multipliers only after aligning both the rent period and income definition. Do not compare a scheduled-rent ratio directly with a collected-rent ratio and treat their difference as a price advantage.
Annual versus monthly GRM
For a $300,000 price and $2,500 scheduled monthly rent, annual rent is $30,000. The annual multiplier is 10.00×; dividing that same price by monthly rent gives 120.00×. The two numbers describe the same price and rent using different periods. A monthly-rent multiplier is twelve times its annual-rent equivalent.
The calculator offers one annual rent input and displays its monthly equivalent. An annual amount such as $30,000.01 does not divide into twelve whole-cent monthly amounts. The displayed monthly equivalent is rounded for readability; the stored annual assumption remains intact. Do not reconstruct annual rent from that rounded monthly display.
Scheduled rent versus collected rent
Scheduled rent describes the rental income assumption before allowances for vacancy and collection losses. Collected or effective rental income reflects those losses. A property with $30,000 scheduled annual rent and $3,000 of vacancy and collection losses has $27,000 remaining before operating expenses. Its scheduled-rent GRM at $300,000 is 10.00×; using $27,000 would instead produce about 11.11× on a different income definition.
This calculator excludes other operating income. Keep laundry, parking, vending and other non-rental receipts outside the rent input. For an analysis that explicitly combines scheduled rent, other operating income, vacancy and recurring costs, use the NOI Calculator and NOI guide.
A worked example and both inverses
Consider a $300,000 purchase, $30,000 scheduled annual rent and a user-selected 9.00× annual target. The target is an assumption for this example, not a recommended threshold.
| Measure | Calculation | Result |
|---|---|---|
| Actual annual GRM | $300,000 ÷ $30,000 | 10.00× |
| Implied purchase price | $30,000 × 9 | $270,000.00 |
| Required annual rent | $300,000 ÷ 9 | $33,333.33 |
| Required monthly rent | $300,000 ÷ 9 ÷ 12 | $2,777.78 |
| Entered rent monthly equivalent | $30,000 ÷ 12 | $2,500.00 |
The calculator's visible default target is separately 10.00× and can be edited. Neither 9.00× nor 10.00× is a market benchmark, recommendation or valuation opinion. An implied price answers an arithmetic question under your assumption; it does not establish what a seller should accept. Required rent does not establish achievable market rent.
Money outputs round half-up to cents and GRM displays to two decimals. Inverses use the entered price, rent and target rather than the displayed GRM. Required monthly rent is calculated directly before rounding, rather than dividing a rounded annual answer. The target accepts up to four decimal places.
Gross rent multiplier versus cap rate
GRM puts price in the numerator and gross rent in the denominator. Cap rate puts net operating income in the numerator and property value in the denominator. The reciprocal of GRM is a gross rent-to-price ratio, not cap rate, because gross rent has not deducted vacancy or operating expenses.
Suppose two properties each cost $300,000 and each schedule $30,000 annual rent. Both have a 10.00× annual GRM. If each loses $1,500 to vacancy, but recurring operating expenses are $8,500 for one and $14,500 for the other, their annual NOI is $20,000 and $14,000 respectively. Using the same $300,000 value, their cap rates are approximately 6.67% and 4.67%. Equal GRMs have concealed a $6,000 annual operating difference before financing.
Use the Cap Rate Calculator and Cap Rate guide to examine that net operating relationship. Then use Rental Property ROI and its cash flow guide to include the entered financing and upfront cash. Different debt payments can widen or reverse the cash-flow comparison again.
GRM is not cash-on-cash return, net yield or an actual payback period. Calling 10.00× “ten years to payback” would ignore vacancy, expenses, debt service, capital needs and the timing of cash receipts and payments.
Rent sensitivity and zero rent
The sensitivity table varies annual rent by −10%, −5%, 0%, +5% and +10%, holding purchase price and target fixed. Each scenario rent rounds to supported cents and reruns the same engine. In the worked example, the endpoints are $27,000 and $33,000 annual rent: actual GRM changes from approximately 11.11× to 9.09×, while implied price at 9.00× changes from $243,000 to $297,000. Required rent stays the same because price and target have not changed.
This is an arithmetic stress test, not a forecast of rent changes. Tiny rents can round to duplicate scenario amounts; rows retain their adjustment labels. Scenarios outside safe money bounds are omitted.
Zero annual rent is a valid stress case. Actual GRM is unavailable because price cannot be divided by zero. The implied price at a positive target is mathematically $0, which is not a claim that the property has no market value. Required annual and monthly rent remain calculable from positive purchase price and target. A zero price or target, negative rent, fractional-cent money or unsupported precision is invalid.
Reusing a deal and interpreting the result
GRM reads purchase price and gross rent from the active browser scenario. Monthly shared rent annualizes by twelve; annual rent stays annual. Editing annual rent saves that canonical assumption with annual cadence. Editing only the target preserves the existing amount and cadence. Implied price and required rent are results and are never automatically applied to the scenario.
A shared URL or report opens an isolated unsaved preview. Browser reports include the inputs, formula version, warnings, sensitivity and assumptions, and can be printed using browser controls. These are educational estimates, not investment, tax or legal advice, an appraisal, or a buy/sell recommendation. The DealYield editorial team maintains this guide under the existing editorial policy and corrections policy.