The fastest way to screen a rental deal: divide the monthly rent by the purchase price. That one number — the rent-to-price ratio — tells you whether a deal is even worth underwriting. Enter the rent and price below for the gross (quick-screen) numbers, or add the fixed carrying costs for the net version.
Reading the numbers: the 1% rule says monthly rent should be at least 1% of the purchase price; the 2% rule (much harder to find) sets the bar at 2%. As a rough guide, a gross rent multiplier under 8 is excellent, 8–12 is solid, 12–15 is marginal, and above 15 rarely cash-flows without major value-add. These are screening rules, not buy signals — run the full underwriting next with the rental deal quick analyzer.