Every school publishes the 25%, 50%, and 75% UGPA and LSAT scores. If you're curious about your odds, this will give you a very good indication. Why do you need the grid?
As an applicant, I too wanted an easy box to tell me my odds. But those grids really are incredibly deceptive. It would be very easy for people who stand a chance at great school to be misled into not applying. You just don't know what is going on behind the numbers. The grids falsely lead you to think that soft factors don't matter.
They also contribute to an exagerated sense of importance given to just two factors in the admissions process. The LSAT/GPA worship infects this entire process. I favor anything that helps take the focus off of them for a bit. The fact that some schools refuse to put every candidate in an LSAT/GPA box is okay with me!