EDIT: Don't download this one. I've posted a better version in the utilities section.If you want a head start on making a spreadsheet, I've attached my own.
It gives optimal target atmosphere conditions from any given starting conditions (including race parameters), and also shows how long it will take (in "TFIyrs": Terraforming Installation Years) given your current tech level, admin bonus,
and average commander bonus (EDIT: the commander bonus input fields are not factored in).
It also does some aggregating of mineral deposit data for reporting/reviewing purposes. Useful for deciding which bodies to mine next.
The second sheet calculates target water vapor pressure based on your terraforming rate (so that you don't waste time adding too much), and gives ETAs for finishing vapor, finishing other gases, and vapor evaporating.
There's probably far more here than you really want, but you can pare it down as you like.
The easiest way to get the data into the spreadsheet is to run a query against the database.
I've included the query on the third sheet if you'd like to do that.
DB Browser for SQLLite is the free tool I use.
DISCLAIMER:
This was designed for personal use, so expect it to contain some things that are not self-explanatory.
I'm happy to answer any questions.
And if you find any errors, I would love to know.