Having a foot long strip of standard formulas to work from that I have collected over the years, I think having a table of sorts will become innevitable.
It depends on wether the tables are based on practical scales or not. When scaling from images, these scales can be anything, so the calculator will be your best tool for getting the formula.
Also Boatsand Bikes, be careful that your plans are the same scale as I find some draw plans vary across the sheet. I.e, the width of the hull on the top/plan view may not be the same as on the front or rear view, so check and work out your formulas for each dimension on each view if they differ.