So excited for this release!
Edit: I originally asked about Microsoft Excel, but I think it is an excel doc 🙂.
Josh
Yes the calculator is done in Excel. In principle it should work down to Excel 2007 but not in lower versions due to some features that were introduced in Excel 2007. I tried my best to make the file survive the effects of time by using legacy and permanent features and avoiding new functions and fancy elements. Of course I cannot warranty it works 100% for Excel 2007 but it should. File was designed under Excel 365 but I have also tested it under Excel 2011 for MAC and it seems to work fine as well.
EDIT 11/12/2020: To avoid any confusion for people seeing this post before the new calculator thread, the new calculator is finally not compatible with 2007. Please read the technical notes in the new thread for more details: IFC Aquarium Fertilizer Calculator
Thank you.
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