Toph uses the Glicko-2 rating system. It was invented by Mark E. Glickman and is an improvement over the Elo rating system.
You can learn more about the mathematics behind Glicko-2 in this document: http://www.glicko.net/glicko/glicko2.pdf
| Rank | Color | Percentile |
|---|---|---|
| SSS | Red | 99 |
| SS | Orange | 95 |
| S | Yellow | 90 |
| A | Yellow | 80 |
| B | Green | 70 |
| C | Blue | 60 |
| E | Purple | 50 |
| Unrated | Grey | - |
