The Two Listings That Look Identical Until You Do the Math
Two homes hit the market on the same street, both listed at $425,000. The first is 1,700 square feet. The second is 2,100 square feet. Same neighborhood, same schools, same asking price. Most buyers stop reading there and pick based on the kitchen photos.
Here's the number they skipped. The first home costs $250 per square foot. The second costs $202 per square foot. For the same money, the second home gives you 400 extra square feet of living space. That's a bedroom and a home office you're getting for free, hidden inside an identical price tag.
Price per square foot is the single fastest way to compare properties that aren't the same size. You take the price and divide it by the finished square footage. A $400,000 home with 2,000 square feet runs $200 per square foot. A $480,000 home with 2,400 square feet also runs $200 per square foot. Now you can see they're priced identically, even though one costs $80,000 more on paper.
Why agents quote it constantly: it normalizes everything. A 1,200-square-foot condo and a 3,500-square-foot house can't be compared by price alone. Per square foot, you can stack them next to each other and see which seller is reaching. In most U.S. metros, single-family homes trade somewhere between $150 and $400 per square foot, with coastal cities pushing well past $700 and some markets sitting under $120.
Where it gets you in trouble: square foot figures lie by omission. A finished basement might count in one listing and not another. A 1980s ranch at $180 per square foot can be a worse deal than a renovated home at $240, because you're about to spend $90,000 fixing the cheap one. Lot size, garage space, and a brand-new roof never show up in the per-square-foot number. Use it to filter, not to decide.
This calculator does the division instantly and lets you line up three comparable properties at once, so the home that looks cheap and the home that actually is cheap stop being the same thing in your head.