ARCT - Aspect Ratio Calculator Tool
It's just at the first stage of completion, calculation of the aspect ratio, the next stage I'll be adding is outputting the rescaling needed for if you want to output it as PAL or NTSC which is letterboxed or anamorphic, including what size borders to add.
Any comments or helpful hints most welcome.
edit: now completed
***Citizen's NTSC DVD/PAL DVD/XviD Info and Feedback Thread***