In Kung Fu Warrior, power levels are noted by letter grades. The following is a list of all the letter rank power levels:

A Grade: Individuals with A grade power level are very powerful and are considered the  highest rank in power.

B Grade: Individuals with B grade power levels are considered powerful and are the second highest rank in power.

C Grade: Individuals of C grade power levels are somewhat powerful and are the third highest rank in power.

D Rank: Individuals of D grade are considered the weakest within the Kung Fu Warrior universe.