Median price measures the transaction amount
Median transaction price focuses on the total amount paid for a property. It is useful when comparing the typical transaction amount within a sufficiently similar market segment.
However, total price alone does not account for differences in property size. A larger parcel may naturally transact for more than a smaller parcel even when their unit values are similar.
PSF adjusts the price for area
Price per square foot expresses a transaction price relative to an area measurement. It can make transactions of different sizes easier to compare when the underlying area definition is consistent.
For a transaction-level PSF analysis, each qualifying transaction should first have its own PSF calculated. The median can then be calculated from those individual transaction PSFs.
This is different from dividing the median transaction price by the median area. Those two calculations are not mathematically equivalent.
Why both metrics matter
Total median price helps answer how much properties in a selected market have typically transacted for. Median PSF helps answer how transaction prices compare after accounting for the relevant area.
Neither metric should be treated as a complete valuation. Property characteristics, transaction dates and the quality of the selected comparison set still matter.
A useful property report therefore presents the metric together with the transaction context from which it was calculated.