[samatman]

I've found that the Calca[†] format hits a nice sweet spot between using an ordinary calculator and running a spreadsheet.

[†]: http://calca.io

It's particularly suited to calculations I'm doing by fetching various numbers from websites, and for the most part it 'composes' by just copypasting a calca into another one.

Basically where the numbers mean something, aren't stable / I don't know them all when I start, but there's no tabular data or significant aggregation going into the question.