Already seen a few threads and posts cropping up about converting scales with FG models, based on their unique WSAM scales. I thew together a little spreadsheet that will do the calculations for you. This will be very useful for the competition.
To use, just enter the WSAM % as a whole number into the orange box. The current scale if printed at 100% is listed next to it in yellow. In the blue area we have the percentage to print at in order to get to common scales. If your intended scale is not listed, enter it in the dark blue box and the percentage is calculated.
I uploaded the file to the English Instructions section of the Downloads page. Zip file contains both an ODS and XLS formatted spreadsheet - both are the same.
PaperModelers.com - Downloads - Fiddlers Green Scale Calculator
Good luck to all in the competition!