F-rank: 300-500
E-rank: 500-1000
D-rank: 1000-2000
C-rank: 2000-3000
B-rank: 3000-5000
A-rank: 5000-10000
S-rank: 10000+
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Higher ranks have larger gaps because people with higher ranks tend to go up and down with their quirk level. All Might in his strong form, for example, can range anywhere from 14000-17000 depending on how much he commits to his transformation.