As most people know, each of the main stats (Swim, Fly, Run, Power, and Stamina) has a letter grade associated with it, which ranges from E to S. You can check the grades for your chao's stats by taking it to the Health Center in SA2B. What isn't shown there is that these grades also have numeric values, as follows:

- E = 0
- D = 1
- C = 2
- B = 3
- A = 4
- S = 5

So how exactly is the point increase decided when a stat levels up? I have done some short testing and I believe it works as follows:

**Points increase = (Grade × 3) + 13 ± 2.**

I will now perform this calculation for each grade.

- If a chao has an
**E grade**for a stat...

Points increase = (0 × 3) + 13 ± 2

Points increase = 0 + 13 ± 2

Points increase = 13 ± 2

Points increase =**11 to 15** - If a chao has a
**D grade**for a stat...

Points increase = (1 × 3) + 13 ± 2

Points increase = 3 + 13 ± 2

Points increase = 16 ± 2

Points increase =**14 to 18** - If a chao has a
**C grade**for a stat...

Points increase = (2 × 3) + 13 ± 2

Points increase = 6 + 13 ± 2

Points increase = 19 ± 2

Points increase =**17 to 21** - If a chao has a
**B grade**for a stat...

Points increase = (3 × 3) + 13 ± 2

Points increase = 9 + 13 ± 2

Points increase = 22 ± 2

Points increase =**20 to 24** - If a chao has an
**A grade**for a stat...

Points increase = (4 × 3) + 13 ± 2

Points increase = 12 + 13 ± 2

Points increase = 25 ± 2

Points increase =**23 to 27** - If a chao has an
**S grade**for a stat...

Points increase = (5 × 3) + 13 ± 2

Points increase = 15 + 13 ± 2

Points increase = 28 ± 2

Points increase =**26 to 30**

This then means that we can work out the minimum and maximum point values that a chao could end up reaching, for each possible grade. Assuming that a chao starts off at level 0 and with 0 points in its stat, it could end up with the following point values at level 99:

**E grade:**1089 to 1485.**D grade:**1386 to 1782.**C grade:**1683 to 2079.**B grade:**1980 to 2376.**A grade:**2277 to 2673.**S grade:**2574 to 2970.