F-: 1/25

F: 1/50

F+: 1/75

E-: 1/150

E: 1/200

E+: 1/250

D-: 1/300

D: 1/500

D+: 1/600

C-: 1/750

C: 1/900

C+: 1/1100

B-: 1/1500

B: 1/1750

B+ 1/2000

A-: 1/5000

A: 1/10000

A+: 1/25000

S-: 1/50000

S: 1/100000

S+: 1/500000

SS: 1/1000000

SS+: 1/100000000

above SS+ scales exponentially

X: 1/???

Explanation:

F rankings: Very little to zero understanding and control of the power or ability.

E rankings: A small amount of understanding and control of the power or ability.

D rankings: An average understanding and control of the power or ability.

C rankings: A decent and slightly above-average understanding and control of the power or ability.

B rankings: A quite good and well-rounded understanding and control of the power or ability.

A rankings: A very good and superior understanding and control of the power or ability.

S rankings: An adept and complete understanding of the ability with absolute control, usually requiring very little or no effort to use.

Above S rankings: Metapotent control and understanding of the ability or power, usually bypasses time and space. The user's use of the ability cannot be measured and often breaks the laws of reality.