I’m a Bethesda hoarder and a crazy person, so I made a spreadsheet. I know there’s a mod if you’re on PC, but I’m on Xbox so I needed some help. Thought you might be interested. I got the data from Starfield Wiki and just added simple functions for the ratios.
Yeah. PC players definitely get StarUI, which shows value / mass, and is also otherwise just a plain better inventory screen.
This spreadsheet is okay for fixed items, but most of your money will come from selling things like weapons, which can have great variety in quality & price.