I do the same thing, but the more I do it the more I have to do it.
I made use of MathCad 2.5 back in the DOS days too, when the on-screen editor used now obscure keyboard commands to create formulas in the on-screen graphics proprietary to MathCad ... MC was a fantastic tool to take a textbook EE formulas and do some what-ifs closer to what one would do normally on a chalkboard, and clearly so, as opposed to re-writing equations to fit into SuperCalc or early Excel spreadsheet ‘cells’ ...
Nowadays one can go over to Wolfram Mathematica website and do a lot more than was ever conceived possible! Including chemistry and physics constants and element properties accessible in their online database(s).