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Table 2 Category-ratio scale of perceived exertion (CR-10) and original RPE

From: Relationship between perceived exertion and blood lactate concentrations during incremental running test in young females

CR-10 scale RPE scale
0 Nothing at all 6
0.5 Very, very weak (just noticeable) 7 Very, very light
1 Very weak 8
2 Weak (light) 9 Very light
3 Moderate 10
4 Somewhat strong 11 Fairly light
5 Strong (heavy) 12
6 13 Somewhat hard
7 Very Strong 14
8 15 Hard
9 16
10 Very, very strong (almost max) 17 Very hard
    *Maximal 18
  19 Very, very hard
  20