Percentile 21 = IQ 88. Smarter than 21% of people. Classification: Low Average — Low average, slightly below the population midpoint. Rarer than 1 in 5.
| IQ | Classification | Percentile |
|---|---|---|
| 100 | Average | 50.0% |
| 120 | Superior | 90.9% |
| 130 | Very Superior / Gifted | 97.7% |