Share '% What's MY percentage? %'

So, I understand being 100% raw. Or, even saying someone is almost 100% raw, but not quite, because there's always some grey area, like with spices or seasonings. But, what goes into a calculation to give people 70%, 80% or 90%, for example? How are these figures obtained? Is it determined by weight or volume? Like, so many pounds of raw vs. cooked? Or, is it determined by breakfast, lunch and ...