Cost Per Square Foot Calculator

Last updated July 2, 2026

Cost per square foot is the most commonly used metric for comparing home prices across properties, markets, and time — but it's a rough comparison that obscures as much as it reveals. Two homes with identical price-per-square-foot figures can represent very different values depending on lot size, age, condition, finishes, layout efficiency, and whether common spaces like garages, basements, and porches are included in the square footage calculation. Appraisers generally use finished above-grade living area as the standardized measure; unfinished basements, attached garages, and covered porches are treated separately or at a reduced value per square foot.

The utility of cost per square foot is in directional comparison: knowing that the median price per square foot in your target neighborhood is $310 tells you whether a specific listing at $340 is priced at a premium and why, or whether a listing at $265 represents relative value and why. It also provides a rough check on new construction pricing: if existing comparable homes in an area sell at $280 per square foot and new construction is offered at $350, the $70 premium buys newness and warranty — a trade-off worth evaluating explicitly. For remodeling decisions, the cost-per-square-foot framework helps assess whether adding a bedroom or finishing a basement produces a return above the cost of the improvement, based on local per-square-foot comparable sales.

Using cost per square foot as a starting point for comparison, not a final verdict on value. Verify that the square footage measurement is consistent across the properties you're comparing, understand what's included in the figure, and look for the specific reasons a property is priced above or below the neighborhood median.