Sq/ft column
In some reports you'll see a Sq/ft column. This column uses your material details (width, height, gutter, margins, ect) to figure out the usable spaces in your materials. It doesn't involve your costs at all so think of it more like a "convenience" column.
For example, let's say we've got this sign material:

Here's the details:
- 8.5"x14"
- 4 up (2 columns, 2 rows)
- 18 points (0.25") of gutter for both columns and rows.
- 36 points (0.5") of margins on all sides.
So you end up with 4 usable spaces that are 3.5"x6.25" each. Tagify uses that usable space to figure out the square footage used.