Price Per Square Foot Calculator

Price per square foot is total price divided by the building's measured area: PSF = Price ÷ Square Feet. A house selling for $425,000 with 1,850 finished square feet trades at 425,000 ÷ 1,850 = $229.73 per square foot. The formula rearranges to Price = Square Feet × PSF when you want to value a property against a known market rate, and to Square Feet = Price ÷ PSF when you want to know what a budget buys at prevailing prices.

The arithmetic is trivial; the definition of square feet is where the real work lies. In United States residential practice, the ANSI Z765 standard measures above-grade finished living area from the exterior walls, excluding garages, unfinished basements, open porches, and attic space with insufficient ceiling height. A finished basement is real living space and adds real value, but it is conventionally reported separately rather than folded into the above-grade figure, because below-grade space consistently sells for less per foot.

Commercial measurement follows a completely different rulebook. BOMA standards distinguish usable square feet, which is the area a tenant occupies exclusively, from rentable square feet, which adds a proportional share of lobbies, corridors, and restrooms. The ratio between them is the load factor or common area factor, typically 12% to 20% in multi-tenant office. A 10,000 usable square foot suite in a building with a 15% load factor is 11,500 rentable square feet, and the rent is quoted on the larger number.

This calculator also reports price per square meter, because most of the world quotes property that way. One square meter is 10.7639 square feet, so a $230 per square foot property is roughly $2,476 per square meter.

Listing A asks $425,000 for 1,850 square feet, which is $229.73 per square foot. Listing B asks $499,000 for 2,300 square feet, or $216.96. Listing C asks $389,000 for 1,540 square feet, or $252.60. On price per square foot alone, B is the best value and C the most expensive.

That ranking is incomplete in a predictable way. Price per square foot almost always declines as size increases, because a large share of a home's value sits in components that do not scale: the lot, the kitchen, the mechanical systems, the bathrooms, and the site work. Doubling the finished area does not double the cost or the value. Comparing a 1,540 square foot house to a 2,300 square foot house on PSF and concluding the smaller one is overpriced is the most common misuse of this metric.

Appraisers handle this by selecting comparables within roughly 10% to 20% of the subject's size, in the same submarket, of similar age, condition, and style, and then adjusting for the remaining differences. If Listing C sits on a half-acre lot in the best school attendance zone in the county and A and B do not, the $252 per square foot may be entirely justified and still be the best buy.

Use the comparable field on this page to test the implied gap. Enter the PSF of a genuinely similar closed sale and the calculator shows what the subject would be worth at that rate and how far the asking price sits above or below it. A subject asking 8% above comps needs an explanation you can name: renovation, view, lot, or condition. If you cannot name it, that is negotiating leverage.

Location, at every scale. Metro, submarket, neighborhood, school attendance zone, and even side of the street all move PSF. Two identical houses a mile apart can differ by 30% per square foot with no physical difference between them, and no amount of arithmetic will reconcile that gap; it belongs to the land.

Size, inversely. Smaller homes carry higher PSF because fixed-cost components spread over fewer feet. Within a single neighborhood, plotting PSF against square footage almost always produces a downward-sloping curve.

Age and condition. A fully renovated 1955 ranch and an untouched one on the same block can differ by 25% or more per square foot. Kitchens, bathrooms, roof, HVAC, windows, and electrical service dominate this spread.

Lot size and site characteristics. PSF is computed on the building, so the land shows up as an unexplained premium. In markets where land is a large share of value, comparing PSF without checking lot size produces nonsense.

Property type. In commercial real estate, PSF varies enormously by asset class. Class A office in a central business district may trade at $300 to $600 per square foot, suburban office at $120 to $250, modern bulk warehouse at $90 to $180, and neighborhood retail at $150 to $350. These are illustrative United States ranges and vary widely by metro.

Construction cost sets a floor over time. When resale PSF falls meaningfully below replacement cost per square foot, new construction stops, supply stalls, and existing inventory eventually reprices upward. Comparing market PSF to local build cost per square foot is a quick check on whether a submarket is over- or under-supplied.

In commercial leasing, per-square-foot pricing is used for rent rather than sale price, and the conventions differ by region and asset class. Office and retail in most United States markets quote annual rent per rentable square foot: a suite at $32 per square foot with 2,400 rentable feet costs $76,800 a year, or $6,400 a month. Industrial space is frequently quoted monthly per square foot in the western United States and annually elsewhere, so confirming the convention before comparing quotes is essential.

Lease structure changes what the number includes. A full-service gross rent of $32 covers taxes, insurance, maintenance, and often utilities. A triple-net rent of $22 plus $10 of operating expense recoveries costs the same $32 in year one, but the tenant carries the escalation risk on the recoverable portion. Two quotes with different structures are not comparable until you build them to the same basis.

Load factor matters as much as the headline rate. A $30 rate in a building with a 12% load factor is cheaper per usable foot than a $28 rate in a building with a 22% load factor. Tenants comparing offers should always convert to cost per usable square foot before deciding.

For investment sales, price per square foot is the secondary check while cap rate is the primary valuation method. A buyer computes value by capitalizing NOI, then divides by building area to see whether the resulting PSF is plausible against recent trades and replacement cost. When the two disagree sharply, one of the assumptions is wrong, and that discrepancy is usually the most informative moment in an underwriting.

Mixing measurement standards. Comparing a tax-assessor square footage against an appraiser's ANSI measurement against a listing agent's estimate produces differences of 5% to 15%. Use one source consistently, and prefer the appraisal.

Including basement or garage area in the numerator's square footage. Below-grade and unfinished space sells for materially less per foot and is reported separately for that reason.

Comparing across size classes. A 1,200 square foot condo and a 3,400 square foot house in the same zip code will never have comparable PSF, and the difference tells you nothing about value.

Ignoring lot value. Two homes with identical PSF where one sits on an acre and the other on a tenth are not equivalently priced.

Using PSF as the sole valuation method. Appraisers use the sales comparison approach with explicit line-item adjustments precisely because a single ratio cannot capture condition, layout, view, and site differences.

Comparing rentable to usable square feet in commercial deals. The load factor gap is 12% to 20% and quietly changes the answer.

Forgetting that PSF is a trailing indicator. Neighborhood averages published by portals lag closed sales by 30 to 90 days, and closed sales lag contracts by another 30 to 45. In a fast-moving market the published PSF describes conditions a quarter ago.