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Gross rent multiplier is price divided by annual gross rent — how many years of gross rent it would take to pay for the property. Lower is better, and it's the fastest way to compare similar properties in the same market.
These are estimates from the numbers you entered. Want them calculated from real comparable rentals for a specific address?
Run a free CMA →Gross rent multiplier tells you how many years of gross rental income it would take to cover the purchase price, assuming no expenses at all. A property at $250,000 renting for $2,200/month produces $26,400 a year — a GRM of 9.5.
Because it ignores expenses entirely, GRM is not a return metric. It's a comparison metric, and it's most useful when you're looking at several similar properties in the same market where the expense profile is roughly comparable.
| GRM | Interpretation |
|---|---|
| 4 – 7 | Low-price, high-yield markets. Often older stock with heavier management demands. |
| 8 – 12 | The broad middle — most stabilized rentals in average markets. |
| 13 – 18 | Higher-priced growth markets. Buyers accepting lower current yield for appreciation. |
| Above 18 | Premium coastal metros. Cash flow is usually negative on financed purchases. |
They answer related questions from different angles. GRM uses gross rent and needs only two inputs, so you can compute it from a listing in seconds. Cap rate uses net operating income and requires a real expense estimate, so it's slower but far more meaningful.
Use GRM to sort a list. Use cap rate to decide. And be careful comparing GRM across markets — a GRM of 10 in a state with 0.6% property taxes is a completely different deal from a GRM of 10 where taxes run 2.5%.
The rent number drives everything above. CompPilot pulls actual comparable rentals for any US address and returns a defensible rent range — plus cap rate, DSCR, cash flow, and a written market memo.
Get a free rental analysis →Lower is better, but the meaningful benchmark is the local market. In high-yield Midwest markets, 6–9 is common. In coastal metros, 15–20 is normal. A GRM meaningfully below comparable properties in the same market is worth investigating — either it's a genuine bargain or something about the property explains the discount.
GRM uses gross rent and ignores expenses; cap rate uses net operating income after expenses. GRM is faster to calculate and useful for initial screening. Cap rate is slower but reflects actual property performance. Two properties with identical GRMs can have very different cap rates if their tax or insurance loads differ.
Roughly, if you know the expense ratio. Cap rate ≈ (1 − operating expense ratio) ÷ GRM. At a 40% expense ratio and a GRM of 10, that's about a 6% cap rate. It's an approximation — the actual expense ratio varies substantially by property age, market, and management approach.
Standard GRM uses gross scheduled rent with no vacancy deduction, which keeps it simple and comparable across listings. Some investors use effective gross income instead for a more realistic figure. Just be consistent — comparing a gross-based GRM against an effective-based one produces a misleading result.
If you run a real estate blog, brokerage, lending, or property management site, you can embed this grm calculator free — two lines of HTML, no API key, no signup, unlimited page views. All the math runs in the visitor's browser, and it renders in an isolated shadow root so it can't collide with your site's styles.
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