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The 1% rule is a two-input filter: monthly rent versus purchase price. Use it to drop obvious mismatches, then send the survivors through a full cash-flow underwrite. It is a screen, not a verdict.
By RentalAnalytics Editorial Team · Published September 3, 2026
The 1% rule is a price-to-rent heuristic. Monthly gross rent should equal at least 1% of what you pay for the property. A $250,000 purchase would need $2,500 a month. A $400,000 purchase would need $4,000 a month.
BiggerPockets describes it as quick-and-simple math that compares price to the gross rent a property can generate, and as a gauge rather than a rule carved in stone.[1] That framing matters. The 1% figure is a filter for a long list of listings, not a claim that 1% of price is a safe or typical market rent.
Divide monthly gross rent by purchase price. If the result is 0.01 or higher, the listing clears the screen. Equivalently, multiply price by 0.01 and compare that target to rent.
Use all-in acquisition cost when you can: contract price plus expected immediate capital to make the unit rent-ready. Using only the list price understates the denominator on a fixer and makes a weak rent look closer to 1% than it is. BiggerPockets' Real Estate Rookie walkthrough of deal analysis makes the same point about purchase price: asking price is a starting input, not the number you have to underwrite.[2]
On the rent side, do not plug in a listing-agent pro forma. Rookie episode 575 is blunt about that source: agent pro formas assume the best case, and underwriting to them is how a deal misses expectations.[2] If the property is leased, start with the current rent roll. If it is vacant, estimate market rent from public data and comps, then run the 1% math on that estimate.
It fails when sale prices sit far above what local rents can support. The National Association of Realtors put the U.S. median existing-home price at $434,100 in July 2026, up 2.0% from a year earlier.[3] One percent of that median is about $4,341 a month. Census Bureau data analyzed by USAFacts put national median monthly rent at about $1,487 in 2024, or $17,844 a year.[4] $1,487 divided by $434,100 is about 0.34%, not 1%.
That national ratio is not a deal-level underwrite. It blends every home type sold with every rental type rented. It does show the direction of the problem: a 1% screen built for cheaper price-to-rent markets will reject most listings in expensive ones, including ones that still clear a reasonable cap rate or DSCR after expenses and financing are modeled.
BiggerPockets makes the geography point directly. In markets such as San Francisco, New York City, Washington, D.C., and Hawaii, the same article says investors are "outrageously excited to even touch the 1% rule."[1] High-cost metros did not break the formula. They broke the assumption that 1% of price is a rent you can actually collect.
Everything that turns rent into cash flow. The rule uses gross rent, so it skips vacancy, property taxes, insurance, maintenance, management, utilities the landlord pays, and capital replacements. It also skips debt service. Two properties with the same 1.1% rent-to-price ratio can have opposite cash-flow outcomes if one has cheap taxes and a 25% down payment and the other has coastal insurance and thin equity.
Rookie 575 groups a real analysis into three buckets: acquisition (price, down payment, loan terms), income, and expenses, including vacancy and CapEx that rookies commonly omit.[2] The 1% rule only touches one number from the first bucket and one number from the second. That is why a pass still has to go through a P&L.
Related screens have the same job description. Gross rent multiplier is price divided by annual gross rent, which is just the 1% rule inverted and annualized. A 1% monthly rent implies a GRM of about 8.3. Both ratios are first cuts. Neither one is cap rate or cash-on-cash.
From a market-rent estimate, not from Fair Market Rent labeled as market. On RentalAnalytics, estimated market rent is a HUD FY2026 50th-percentile plus Census ACS blend. HUD publishes that 50th-percentile series separately and states that those figures are not Fair Market Rents.[5] HUD FMR and Small Area FMR stay on the result as the 40th-percentile / voucher number. We do not call FMR "market rent," and we do not use a listing-scrape product as the hero rent.
The rent estimator runs that HUD 50th-scaled ZIP estimate and shows FMR beside it, labeled as 40th / voucher. Use the market estimate (or in-place rent) in the 1% screen. Use FMR when you are talking about voucher payment standards. A longer walkthrough of the 40th-percentile file is in Reading HUD Fair Market Rents.
Treat it as a sort key. Pull asking price and a conservative monthly rent for every listing on the list, compute rent divided by price, and rank. Listings far below 1% in a market where 1% is still common can usually be dropped without a full model. Listings in a high-cost metro that land at 0.4% to 0.6% are not automatically dead. They are telling you that price is rich relative to rent, so the underwrite has to work harder on expenses, vacancy, and financing.
BiggerPockets' own close on the rule is to save time for deals worth analyzing, not to reject a property solely because it misses a round number by a tenth of a percent.[1] The next step is the same process Rookie 575 describes: collect acquisition, income, and expense inputs, then run NOI, cash flow, cash-on-cash, and cap rate in a calculator instead of a napkin.[2]
The cash flow analyzer is that second step on this site. It takes purchase price, financing, rent, vacancy, taxes, insurance, maintenance, and management, then returns a monthly and annual P&L, cash-on-cash, and break-even occupancy. Pair it with the NOI walkthrough if you want the cap-rate and DSCR identities in one place. This article is education on a screening heuristic. It is not advice to buy, pass, or price a specific property.
The 1% rule is a screening heuristic: monthly gross rent should be at least 1% of the purchase price. A $300,000 property would need $3,000 a month in rent to clear it. It is a first pass, not a profitability test.
No. In many high-cost metros almost no listing clears 1%. A property can still produce acceptable cash flow, cap rate, or DSCR after a full underwrite. The rule only tells you the price-to-rent starting point is tight.
Sale prices rose faster than rents. The July 2026 U.S. median existing-home price was $434,100, which would need about $4,341 a month to hit 1%. Census-based national median rent was about $1,487 a month in 2024, or roughly 0.34% of that price.
Not as a market-rent stand-in. HUD Fair Market Rents are a 40th-percentile voucher schedule. For a market-level estimate, use HUD 50th-percentile rents blended with Census ACS, then confirm with local comps. FMR stays the labeled 40th / voucher number.
A full cash-flow underwrite: vacancy, taxes, insurance, maintenance, management, capital reserves, and debt service. That produces NOI, cash flow, cash-on-cash, and DSCR. The 1% rule does not compute any of those.
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