I made an excel spreadsheet that I use for my own production chain mods. But I created it as a universal tool.
I plan to add in cycles per hour to convert to cycles per month and vice versa; as in the xml files you set the cycles per hour then multiple by 24 to get your monthly cycles(Regardless of days per month).
Will also add in % profit from input to output. I spent a lot of time making this tool. And it's freely available
https://www.mediafire.com/file/6gh4z6w6ao6pjt3/ProductionCalculator.xlsx
I also made a tutorial video for how to use it on the tube of you.

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This will clear your desk of scratch paper calculations and make your life a lot easier. I hope this helps more as dozens are already using it and loving it.