What does an IQ of 105 mean?
Above the average on the reference scale, at approximately percentile 63.06.
- IQ score
- 105
- Percentile
- 63.06
- At or above
- 36.94%
Normal reference · mean 100 · SD 15. These are calculated values, not observed starp population ranks.
Where 105 sits on the IQ scale
A score of 105 is 5 points above the mean. Dividing by the standard deviation gives (105 − 100) ÷ 15 = 0.33. The normal cumulative distribution converts that standardized position into percentile 63.06.
This lies in the upper half of the central 85–115 interval. It is above the scale mean, but the total alone does not identify a particular strength in memory, numbers or spatial reasoning.
How common is a score of 105?
Approximately 36.94% of this model lies at or above 105—about 1 in 3. This is a cumulative share, not the chance of scoring exactly 105. A continuous model does not assign a positive probability to one exact value.
Compared with IQ 100, the reference percentile is 13.06 percentage points higher. Equal IQ-point gaps do not create equal percentile gaps: the middle of the bell curve contains more area than its ends.
Compare nearby scores
Compare 100 and 105 or calculate 105 on another scale. A small difference between test results is not automatically a meaningful change.
How this relates to starp
starp's current scoring map does not produce exactly 105. Its neighboring results are 104 for 23 correct answers and 109 for 24 correct answers out of 30. This guide explains the conventional scale value 105; it does not invent an intermediate starp result.
See the scoring method and how raw scores differ from IQ estimates.
Questions about IQ 105
Is 105 a good IQ score?
105 is above the reference mean of 100. It is a higher score on that scale, but a number alone cannot establish a specific skill profile or predict success.
What percentile is an IQ of 105?
On a normal scale with mean 100 and standard deviation 15, 105 corresponds to approximately percentile 63.06. Around 36.94% of that model lies at or above it. Use an assessment's own norms for an actual reported rank.
Does an IQ of 105 mean 105% correct?
No. IQ is a scaled score. Percentage correct depends on the questions and scoring rules; percentile describes a relative position. These three quantities are not interchangeable.
Method: NIST's normal-distribution formula. Percentiles here are calculated reference values, not observed starp population ranks. About starp scoring.