Gross Rent Multiplier (GRM) Calculator
Calculate the Gross Rent Multiplier for rental property investments.
Compare property price to annual rental income to assess investment quality.
Gross Rent Multiplier (GRM) is a quick-screening metric used to compare the relative value of income-producing properties. It tells you how many years of gross rent income equals the property’s purchase price — lower GRM generally indicates better value.
The GRM formula:
GRM = Property Price ÷ Annual Gross Rent
Or equivalently:
GRM = Property Price ÷ (Monthly Gross Rent × 12)
Estimated property value from GRM:
Estimated Value = Annual Gross Rent × Comparable Area GRM
Monthly rent from price and target GRM:
Required Monthly Rent = Property Price ÷ (Target GRM × 12)
Worked example: A duplex is listed at $420,000 and generates $3,200/month in total rent ($38,400/year):
- GRM = $420,000 ÷ $38,400 = 10.94
A comparable duplex sold last month for $380,000 with $3,500/month rent = GRM of 9.05. The listed property’s GRM of 10.94 suggests it is priced 20% above what comparables support.
GRM benchmarks by market type:
| Market | Typical GRM |
|---|---|
| Small cities / rural | 4–7 |
| Mid-size metro | 7–10 |
| Large urban markets | 10–15 |
| High-cost cities (NYC, SF, LA) | 15–25+ |
GRM limitations: GRM uses gross rent only — it ignores operating expenses (taxes, insurance, maintenance, vacancy, management), which vary significantly between properties. Two properties with the same GRM can have very different Net Operating Income (NOI) and actual cash flow.
GRM vs. Cap Rate:
- GRM = simple ratio, uses gross rent, no expenses considered
- Cap Rate = NOI ÷ Price; NOI = Gross Rent − Operating Expenses
Use GRM for quick initial screening; use Cap Rate for serious due diligence.