The 1% rule is a first-pass screen, not a deal-decision tool. A property at 1% monthly rent-to-price is the rough cutoff where the math tends to work after taxes, insurance, vacancy, and maintenance. Above 1% is increasingly cash-flow-friendly; below 1% you need a thesis (appreciation play, value-add, depreciation shelter) to justify it.

GRM (gross rent multiplier) is the inverse view: how many years of rent it would take to pay the property cash. Lower is better. A GRM of 8 means rent equals price in 8 years; a GRM of 15 means 15 years. Cash-flow markets (Memphis, Cleveland, parts of Ohio) often see GRM under 10; coastal appreciation markets routinely run 20+.

DSCR connection: rent-to-price is closely related to but not the same as DSCR. DSCR factors in your actual loan payment + taxes + insurance, not just price. A property that fails the 1% rule on price can still pass DSCR at 1.0+ if you put more equity down or rates drop. Use rent-to-price for fast screening; use the DSCR pricer for actual deal underwriting.