The old rule of thumb—rent for five years, then buy—is getting shakier in a lot of American markets.
With mortgage rates hovering near 6.5% and home prices still stubbornly high in many metros, the break-even point has quietly stretched out for a lot of would-be buyers.
That's where a rent-versus-buy calculator earns its keep.
Instead of guessing, you plug in your actual numbers and see how many years it takes before owning beats renting in your specific situation.
The catch is that most free calculators online use lazy assumptions.
They compare a mortgage payment to a rent check and call it a day.
That ignores property taxes, insurance, HOA fees, maintenance, closing costs, and the opportunity cost of your down payment sitting in a house instead of an index fund.
A more honest calculation starts with the "5% rule." Take the home price, multiply by 5%, divide by 12.
That's roughly what it costs per month to own—covering taxes, insurance, maintenance, and the forgone return on your down payment.
If rent in your area is meaningfully cheaper than that number, renting usually wins.
If it's higher, buying starts to make sense.
Run that on a $400,000 house and you get about $1,667 a month.
Add the actual mortgage payment on top if you're financing most of it, and the true monthly cost often lands closer to $3,300 in many markets.
Compare that to local rent before you sign anything.
In Midwest metros like Cincinnati or Kansas City, break-even windows are often three to four years.
In coastal cities like San Francisco or Seattle, it can stretch past seven or eight years once you factor in transaction costs and the fact that rents there haven't climbed as fast as prices.
Realtor commissions, title fees, and transfer taxes typically eat 8% to 10% of a home's value.
On a $400,000 house, that's $32,000 to $40,000 gone the moment you sell.
If you're not staying put for at least five years, that hit can wipe out any equity you built.
Budget 1% of the home's value per year, minimum.
On that same $400,000 house, that's $4,000 annually, or about $333 a month, for a new roof, HVAC, water heater, and the random stuff that always breaks in month two of ownership.
The good news is the math is doable in about ten minutes.
Grab your target home price, your local tax rate, a realistic insurance quote, and current rent for a comparable place.
Plug them into a calculator that lets you adjust maintenance, appreciation, and investment returns.
The New York Times and NerdWallet both have solid free versions.
Then do the boring thing: check whether you plan to stay put long enough to clear the break-even year.
If you're not sure, renting another year while you save isn't failure—it's usually the cheaper move.
The rent-versus-buy question isn't a philosophy debate, it's arithmetic, and the answer changes with every rate cut and price tick.
Final Thoughts
Run your own numbers before you let a lender or a landlord tell you what to do.