1% Rule Calculator for Rental Property

A fast filter, not a verdict

Real estate investors look at far more listings than they ever buy, and most of those listings deserve about ten seconds of attention before moving on. The 1% rule exists for exactly that triage: monthly rent should be roughly 1 percent of the all-in price for a property to warrant a closer look.

A $250,000 property renting for $2,500 a month passes cleanly. One renting for $1,400 does not, and that gap is usually wide enough that no amount of creative financing closes it. The rule’s entire value is speed — it screens out properties before you spend an hour building a full cash flow model on one that was never going to work.

Why all-in price, not just the purchase price

The rule measures rent against all-in price — purchase price plus rehab — rather than the purchase price alone, and that distinction matters more than it looks.

A property bought for $150,000 needing $50,000 of rehab has an all-in price of $200,000, and its rent needs to reflect that full commitment, not the smaller purchase number. Measuring only against purchase price makes fixer- uppers look artificially attractive, because the rehab capital is just as real and just as tied up as the purchase capital — it simply arrives on a different invoice.

Where the 1% rule breaks down as a market benchmark

The rule dates from an era of different price-to-rent ratios nationally, and it behaves very differently depending on where a property sits today.

In many expensive coastal and urban markets, few properties clear 1 percent at current prices — rents have not kept pace with the run-up in purchase prices in those areas over the past decade. Investors in those markets often use a 0.5 to 0.7 percent threshold instead, treating it as a market-calibrated version of the same underlying idea rather than abandoning the concept entirely.

In lower-cost markets with strong rental demand, properties clearing 1.5 or even 2 percent are not unusual, and in those markets the rule remains a meaningful filter in its original form.

The practical takeaway: calibrate the threshold to the market you are actually buying in, and use the ratio itself — comparable across your own deal pipeline — rather than a fixed pass/fail line imported from elsewhere.

What passing the rule does not tell you

This is the part most often misunderstood, and it is worth being direct about: the 1% rule says nothing about financing, taxes, insurance, vacancy, or maintenance. It is built entirely from gross rent and price.

A property can clear 1 percent comfortably and still produce negative cash flow with a small down payment at a high interest rate, or in a high-property-tax jurisdiction where the tax bill alone consumes a meaningful share of that rent. The rule tells you a property is worth underwriting fully. It does not replace that underwriting.

Building the full picture after the screen

Once a property clears the threshold you have set for your market, the next step is the analysis this rule deliberately skips.

The cap rate calculator brings in actual operating expenses to measure return against price without financing involved. The rental cash flow calculator adds the mortgage payment plus vacancy, maintenance, management and capital expenditure reserves to show what the property produces in an ordinary year, not an ideal one. Running a property through all three — the 1% screen, cap rate, and full cash flow — in sequence is how disciplined investors avoid spending underwriting time on properties that were never going to work, while still catching the real risks the quick screen cannot see.

A property that fails the rule is not automatically a bad investment

The 1% rule is silent on appreciation, and some of the strongest long-term real estate returns have come from properties that never came close to clearing it — properties in appreciating markets where rent yield was secondary to equity growth.

What the rule protects against is the opposite mistake: buying on appreciation hope alone in a market with no strong appreciation case, while also accepting negative cash flow every month in the meantime. If a property fails the rule and there is no specific, evidence-based appreciation thesis behind it, that combination is the one worth being cautious about.

For fix-and-flip specifically, where rental yield is irrelevant and the exit is a sale rather than a lease, the flip ARV calculator is the more relevant screening tool — it measures the deal against after-repair value and target profit margin instead of rent.