On English:

(Normal ¤ 0x33 + Super ¤ 0x33 + Ultra ¤ 0x40 + Max ¤ 0x4C) / 0x100

Normal: 51/256 Super: 51/256 Ultra: 64/256 Max: 76/256

On Japanese:

(Normal ¤ 0x14 + Super ¤ 0x19 + Ultra ¤ 0x1E + Max ¤ 0x33) / 0x100 ?

Normal: 20/256 ? Super: 25/256 ? Ultra: 30/256 ? Max: 51/256 ?

What's with ? is not confirmed yet.

Japanese seems correct to me