Where 121 sits on the bell curve
This score is 21 points above the average of 100, or 1.40 standard deviations. The shaded part of the curve, everyone who scores lower, covers about 91.9% of people.
What an IQ of 121 means
121 sits in the lower half of the Superior range (120 to 129). It is 1.40 standard deviations above the mean of 100, so about 92 in 100 people score lower.
The Superior range runs from 120 to 129. Range names come from the Wechsler scales; they are labels for parts of the curve, not hard lines, so 120 and 122 reflect almost the same performance.
Whether 121 counts as a good IQ score depends on the comparison: against everyone, or against the people you study or work with.
How rare is an IQ of 121?
If scores follow the standard bell curve, this is how many people you would expect to reach this score or higher:
- In a class of 30: about 2.4
- In an office of 250: about 20
- In a town of 10,000: about 808
- In a city of 1 million: about 80,757
121 compared with nearby scores
| IQ | Percentile | Range | How rare |
|---|---|---|---|
| 111 | 77th | High Average | 1 in 4.3 |
| 116 | 86th | High Average | 1 in 7 |
| 121 | 92nd | Superior | 1 in 12 |
| 126 | 96th | Superior | 1 in 24 |
| 131 | 98th | Very Superior | 1 in 52 |
"How rare" counts people at that score or higher.
121 and the usual reference points
- 21 points above 100, the average by definition.
- 6 points above 115, one standard deviation above average (about the 84th percentile).
- 9 points below 130, two standard deviations above average and the usual Mensa line (top 2%).
- 24 points below 145, three standard deviations above average (about 1 in 741).
How much to trust a single score
No test measures IQ exactly. Clinical tests such as the Wechsler scales report a confidence interval of roughly 5 points either side, so a measured 121 is best read as "probably between 116 and 126". Shorter online tests carry wider ranges, which is why our free test shows a 90% range next to every result.
Scores also move between sittings. Tiredness, stress and practice with the puzzle types can each shift a result by a few points, so the range name tells you more than the exact number.
Frequently asked questions
Is 121 a good IQ score?
Yes. An IQ of 121 is in the Superior range (120 to 129) and higher than about 92% of people. About 1 in 12 people score 121 or higher.
What percentile is an IQ of 121?
An IQ of 121 is at about the 92nd percentile. On the standard scale (mean 100, standard deviation 15) it is +1.40 standard deviations from the average.
How rare is an IQ of 121?
About 1 in 12 people score 121 or higher, which is 8.1% of the population.
How close is 121 to Mensa level?
It is 9 points below the usual Mensa line of 130, the top 2%. Any single score has a margin of error of several points, and only a supervised test counts for admission.
How accurate is an online IQ score of 121?
Treat it as a range, not an exact number. Clinical tests report a confidence interval of roughly 5 points either side, and short online tests have wider ranges, so read any single result as a band rather than an exact point.
Nearby IQ scores
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