Well, as a person who is always looking to get the greatest economy out of her leather, I always have a tapemeasure handy. On a full belly (which are often oddly shaped), the greatest length is usually corner to corner- if I *must* have that piece, I bisect the piece *off center* so I can cut a few belts or whatever out of that center piece. Then again, I use vegtsn, usually undyed. I case and sweat first, then press down any areas that are rippled to get the piece as uniform as possible. If you are doing ring belts, you might want to also consider more types of leather/grades that might availavle to you. For instance, tandy is ok for alot of things, but frankly, their prices on "economy leathers" stink. try Wickett and Craig instead. I make *alot* of different things, so even those tough "lobes" that can be found oon the edges get used in my shop. "The greatest length" on a given piece of leather is often on a diagnal if it is not fairly square- but you might want to consider if the remaining pieces will be useful, or waste.