Interpreting IQ results and using them wisely
An IQ score looks like a precise fact about a person. It is better understood as an estimate, produced by a particular test, on a particular day, compared with a particular group.
An estimate, not a fact
Most modern IQ tests place scores on a scale with an average of 100 and a standard deviation of 15, comparing you with others of the same age. Roughly two-thirds of people score between 85 and 115. Every score carries measurement error, which is why professional reports give a confidence interval rather than a single number. Interpretation also depends on the test used, the conditions and the norms.
Reading a score properly
| Element | What it means | Why it matters |
|---|---|---|
| Scale | Mean 100, standard deviation 15 on most tests | Lets scores be compared with a reference group |
| Norms | The comparison group and when it was collected | Old norms can shift results |
| Confidence interval | The range your true score likely falls in | A single number overstates precision |
| Subtest profile | Strengths and weaknesses across areas | Often more useful than the total |
| Conditions | Sleep, anxiety, distraction, familiarity | Can move a score meaningfully |
| Test type | Full battery vs short online quiz | Determines how much weight to give it |
What's actually going on
Scores are estimates. Standards for educational and psychological testing emphasize reporting the precision of scores and interpreting them in context rather than as fixed attributes. That's why a professional report might say a full-scale score of 112 with a 95 percent confidence interval of about 107 to 117, and spend more space on the pattern across areas than on the single figure.
Guides in this section
- Explainers: what a score represents and how reliability and validity apply to IQ testing.
- Questions: good scores, low scores, cultural fairness, score changes, retakes and formal assessment.
- Contexts: careers, studying, self-esteem, talking about results and when not to use an online test.
Interpretation questions
What does an IQ score actually mean?+−
It places your performance on a test relative to a comparison group, usually with an average of 100.
How accurate is a single IQ score?+−
Every score has measurement error, which is why confidence intervals are used.
Is the subtest profile important?+−
Often more useful than the overall score, since it shows relative strengths.
Can an online test give me a real IQ?+−
No. It can estimate performance on its own tasks, not replace a standardized assessment.
Continue exploring
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