Does anyone use a computer for sensitometry?

Since my darkroom has to double as a computer study, I thought I'd make more use of the computer for printing and processing. My half thought out idea (half-baked perhaps) was to plot the characteristic curves of the films and paper that I use into a spreadsheet; such that I could get a readout of subject brightness versus expected paper density for various development times and paper grades. I reckon the few minutes spent on the computer would at least put me in the right ball park before I even fire up the enlarger. Any thoughts? Anyone else tried a similar system?

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