What IQ Scores Mean (and What They Don't)
An IQ score is a comparison, not a measurement of worth: it places your test performance relative to other adults. Here's how to read one honestly.
By Zunix Editorial Team · Published · Updated
IQ scores are so familiar culturally that it is easy to forget what they actually are: standardized comparisons. An IQ score does not count anything the way a thermometer counts degrees. It expresses how your performance on a particular test compares with a reference population, rescaled so that the average is 100.
How the scale works
Modern IQ tests are normed: the test is administered to a large representative sample, and raw scores are converted so the population mean is 100 and the standard deviation is 15. On that scale, roughly two-thirds of people score between 85 and 115, and scores beyond 130 or below 70 are each found in only about two percent of the population.
Typical score ranges
- 85–115: the broad average range where most people score
- 115–130: above average — roughly the top sixth of scorers
- 130+: well above average — roughly the top two percent
- 70–85: below average — a range, not a diagnosis
What moves a score
Scores are stable enough to be meaningful and variable enough to deserve humility. Sleep deprivation, anxiety, unfamiliarity with testing, screen conditions and simple practice effects can all shift a result by several points. Retesting on similar material usually raises scores — which is why a second attempt at the same online test is not evidence of a smarter you, only a more practiced one.
What a single online score can't tell you
A professionally administered IQ assessment involves multiple subtests across different abilities, standardized conditions, and interpretation by a qualified psychologist. An online self-assessment — including ours — samples one ability under uncontrolled conditions. It can be genuinely informative and genuinely fun; it cannot diagnose intellectual disability or giftedness, qualify you for services, or capture creativity, judgment, character or expertise.
Reading your result well
Treat an online score as an estimate with a wide confidence band. Look at the band label rather than fixating on a single number; note the conditions you took it under; and if the number matters for a real decision in your life, invest in a professional assessment rather than an internet quiz — however carefully the quiz was built.
Frequently asked questions
Is 100 a good IQ score?
By construction, 100 is the average of the population the test was normed on. Scoring near 100 means performing like most adults do — which is, by definition, typical.
Can my IQ change over time?
Measured scores can and do move: with age, with health, with education, and simply with retesting. Large sustained changes in underlying ability are less common than day-to-day variation in measured scores.