When I learn someone's pant size I always wonder how much fatter they are than me, or vice versa. So I made up a handy chart. It's only a rough estimate, of course, since people aren't spheres. Correction: Most people.
|Waist||Radius||Volume||% of 33"|
This type of information can come in handy if you get in a fight, or if you have to order pizza.
Unfortunately, I have no idea how women's sizes fit into this scheme.