We all hate $/sqft questions

I know, I know. We all hate these kinds of questions, but here I am asking one:

We are building a home and at the end of the project I would like to have a general $/sqft idea of what it cost. (For no reason other than my own curiosity)

Our total $ spreadsheet includes everything from permitting and design, Land, Utilities (including $60k for drilling a well), to the Fully finished walkout lower level.

The lower level will be a full walkout with 3 of the 4 bedrooms down there.

The footprint is 1915 sq ft on each level. Total 3830 on both floors combined.

My question is this: if you were to calculate the $/sqft for yourself, WOULD YOU DIVIDE THE TOTAL BY 1915 OR 3830?

I realized this is a nuanced question with lots of factors, I’m just asking which number you would personally use for your own calculations.