Where 105 sits on the bell curve
This score is 5 points above the average of 100, or 0.33 standard deviations. The shaded part of the curve, everyone who scores lower, covers about 63.1% of people.
What an IQ of 105 means
105 sits in the upper half of the Average range (90 to 109). It is 0.33 standard deviations above the mean of 100, so about 63 in 100 people score lower.
On the IQ score scale, the Average range runs from 90 to 109. Range names come from the Wechsler scales; they are labels for parts of the curve, not hard lines, so 104 and 106 reflect almost the same performance.
Whether 105 counts as a good score depends on the comparison: against everyone, or against the people you study or work with.
How rare is an IQ of 105?
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 11
- In an office of 250: about 92
- In a town of 10,000: about 3,694
- In a city of 1 million: about 369,441
105 compared with nearby scores
| IQ | Percentile | Range | How rare |
|---|---|---|---|
| 95 | 37th | Average | 1 in 1.6 |
| 100 | 50th | Average | 1 in 2 |
| 105 | 63rd | Average | 1 in 2.7 |
| 110 | 75th | High Average | 1 in 4 |
| 115 | 84th | High Average | 1 in 6.3 |
"How rare" counts people at that score or higher.
105 and the usual reference points
- 5 points above 100, the average by definition.
- 10 points below 115, one standard deviation above average (about the 84th percentile).
- 25 points below 130, two standard deviations above average and the usual Mensa line (top 2%).
- 40 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 105 is best read as "probably between 100 and 110". Online IQ 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 105 a good IQ score?
An IQ of 105 is in the Average range (90 to 109) and higher than about 63% of people. About 1 in 2.7 people score 105 or higher.
What percentile is an IQ of 105?
An IQ of 105 is at about the 63rd percentile. On the standard scale (mean 100, standard deviation 15) it is +0.33 standard deviations from the average.
How rare is an IQ of 105?
About 1 in 2.7 people score 105 or higher, which is 36.9% of the population.
Is 105 an average IQ?
Yes. Half of all people score between 90 and 109, the Average range, and 105 is inside it: higher than about 63 in 100 people.
How accurate is an online IQ score of 105?
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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