Price Per Square Foot Calculator

How to use the price per square foot calculator

What this calculator does

This calculator standardizes a property’s price or rent by its finished floor area. It can calculate Price per sqft from Price or rent and Square footage, but it also works in reverse: enter an area and a known unit price to estimate a total price, or enter a total price and unit price to estimate area. You can compare up to three properties, view each result in square feet, compare all valid properties on a common USD-per-square-foot basis, and export the current model to Excel. The result is an arithmetic comparison, not an appraisal, investment recommendation, or prediction of a property’s market value.

When to use it

Use the calculator when comparing homes with different sizes, checking whether two rental listings have similar monthly rent per square foot, estimating an asking price from a local unit-price benchmark, or normalizing the cost of comparable commercial spaces. Comparisons are strongest when the properties are in similar locations and use consistent area definitions. Fannie Mae’s appraisal guidance requires consistent reporting of above- and below-grade areas and use of the ANSI measurement standard in covered appraisals, illustrating why the square-footage basis matters. See the Fannie Mae improvements and square-footage guidance.

How to calculate

1. For Property 1, enter any two values: Price or rent, Square footage, or Price per sqft. The third field becomes the calculated field.
2. Read the highlighted Property 1 result and the four live result cards. The common Price per square foot value is used for cross-property comparisons.
3. Turn on Compare with a second property? and, when needed, Compare with a third property?. Enter any two values for each added property.
4. Review the comparison bar chart and the Comparison details table. Lower USD per ft² means a lower price relative to reported finished area, not necessarily a better overall property.
5. Select Download Excel to export the current valid state. Select Reset to clear all values and remove the second and third properties.

Input guide

Price or rent is required as one of the two known values for each property unless it is the value being solved. Enter a positive U.S.-dollar amount using an en-US decimal point; commas and a leading dollar sign are accepted, for example $290,000. Zero, negative numbers, scientific notation, and ambiguous decimal-comma values are rejected. Increasing price while area is unchanged raises price per area. A common mistake is comparing a purchase price in one row with monthly rent in another.

Square footage is a positive finished-floor-area number in square feet, for example 1,400. One international foot equals exactly 0.3048 meter, so a square foot has an exact standards-based definition; the NIST international-foot definition explains that exact relationship. Increasing area while price is fixed lowers the unit price. Do not mix gross building area, lot area, unfinished space, and finished living area without understanding the source definition.

Price per sqft means U.S. dollars per square foot. Enter a positive amount such as 207.14. Higher unit price raises the estimated total when square footage is fixed. Do not enter a price per square meter or another area unit without converting it first.

Compare with a second property? and Compare with a third property? are optional switches. They reveal the additional property fields and include those properties in the calculated count, chart, table, and workbook only when their rows are active and valid. Turning off the second property also turns off the third.

Output guide

The header pills show Shown, the number of visible properties; Calculated, the number with complete valid models; Best value, the valid property with the lowest USD per ft²; and Spread, the percentage by which the highest valid unit price exceeds the lowest. A zero spread means equal unit prices. A large spread flags a difference to investigate, not a guaranteed bargain.

The primary result is Property 1 price per area. Each property panel then shows Price or rent, Square footage, and Price per square foot, identifying which value was calculated from the other two. The chart bars represent valid properties’ USD per ft². The table columns repeat the same model and add Difference from best, where 0% marks the lowest valid unit price.

Worked example

Enter $290,000 for Property 1 Price or rent and 1,400 ft² for Square footage. The calculator divides 290,000 by 1,400, producing $207.14/ft². Add Property 2 at $310,000 and 1,200 ft² to get $258.33/ft², then Property 3 at $400,000 and 2,400 ft² to get $166.67/ft². Property 3 becomes Best value, and the spread is 55.00% because 258.3333 is 55% above 166.6667. The DOM, comparison chart, detail table, and Excel workbook all use those same canonical values.

Learn more

Before comparing listings, confirm what the reported area includes. The U.S. Census Bureau’s Survey of Construction definitions distinguish finished floor space from garages, carports, porches, unfinished attics, utility rooms, and unfinished basement areas. Consistent measurement is essential because the denominator directly changes every unit-price result.