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IQ score meaning

What does an IQ of 42 mean?

An IQ score of 42 falls in the Below average IQ range. On a scale with mean 100 and standard deviation 15, it is approximately at the 0th percentile.

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42
Below average IQ range
0%
approx. percentile
40-69
range

IQ 42 interpretation

Scores in this range are usually interpreted cautiously and should be reviewed with the full test profile.

The percentile means that this score is higher than roughly 0% of the norm group and lower than roughly 100.0% of the same group.

A single IQ number should be interpreted together with the specific test, age norms, confidence interval, and the pattern of strengths and weaknesses across subtests.

Useful next pages

Compare nearby IQ scores

IQ 47 Below average IQ range Approx. percentile: 0%
IQ 52 Below average IQ range Approx. percentile: 0.1%
IQ 57 Below average IQ range Approx. percentile: 0.2%

IQ score meaning FAQ

One IQ number is only a summary. It should be read with the test name, score range, confidence interval, age norms, and subtest pattern.

Tests can differ in tasks, timing, norms, reliability, language, and difficulty. Motivation, fatigue, and test conditions can also affect results.

A higher score can indicate stronger performance on certain cognitive tasks, but real-life success also depends on knowledge, habits, health, personality, opportunity, and goals.

Practice can improve familiarity with task types and reduce test anxiety. That does not always mean the underlying ability changed by the same amount.

Read the full score chart, percentile guide, and age-norm explanation. Together they give a more balanced view than a single score page.
IQ test online

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Use the BrainApps IQ test as a quick way to practice cognitive tasks and get a structured result. Treat online scores as screening information, not a clinical diagnosis.

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