What Does an IQ of 120 Mean?

An IQ of 120 is at the 90.9th percentile: it is higher than about 90.9% of people of the same age, and about 1 in 11 people scores 120 or higher. On the WAIS-IV it is classed as Superior. Like every IQ score it is an estimate with a margin of error of several points, and it predicts outcomes only on average.

IQ 120 percentile and how it is calculated

IQ tests are scaled so that scores follow an approximately normal distribution with a mean of 100 and a standard deviation (SD) of 15. A score of 120 is 1.33 standard deviations above the mean (z = +1.333). Plugging that into the normal cumulative distribution function gives a percentile of 90.9. Put simply: in a representative group of 1,000 people of your age, about 91 would score 120 or higher.

Some reports use a slightly different convention — for example the percentage of people scoring strictly below 120, or a value read from the test’s own norm tables rather than the ideal curve — so you may see a percentile a fraction of a point different. The full list for every score from 55 to 160 is in our IQ percentile chart.

How 120 compares with nearby scores

Is 120 a good IQ score?

Yes — 120 is a high score, above about 91% of people. See also what counts as a good IQ score.

How rare is a 120 IQ?

On the normal model, about 1 in 11 people scores 120 or higher. That is about 91,211 per million people, or roughly 4,560,600 people in a country of 50 million. Rarity grows quickly in the tails: each extra 5 points above 100 multiplies the rarity, which is why the step from 120 to 125 (1 in 11 → 1 in 21) is much bigger than the step from 115 to 120.

120 IQ classification

Different tests use different descriptive words for the same number. For a full-scale score of 120:

These labels describe where a score falls relative to peers; they are not diagnoses. Newer reports, such as the WAIS-5 sample report, use plainer wording (“Average”, “Above average”, “Very high”). See all bands in IQ score ranges and classification.

What an IQ of 120 means in practice

An IQ of 120 is at about the 91st percentile, so roughly one person in 11 scores 120 or higher. It is the first score in the “Superior” band on the WAIS-IV (“Very High” on the WISC-V), one and one-third standard deviations above the mean.

120 is a common reference point in discussions of “120 IQ jobs”. Gottfredson (1997) described occupations such as research analyst and advertising manager, whose applicants’ median Wonderlic scores corresponded to an IQ of roughly 120. In Wolfram’s (2023) UK data, none of the larger occupational groups we list had an estimated average as high as 120 — the tiny sample of electrical engineers (N = 9) came closest at about 118. So a 120 is above the average of every profession shown here, yet it is far from rare inside them: with a 13-point spread, roughly 30% of solicitors or doctors would be expected to score higher.

The “threshold hypothesis” you may have read about — that creativity stops benefiting from IQ above about 120 — is debated and depends heavily on how creativity is measured, so it should not be treated as a settled rule.

120 IQ jobs, education and life outcomes: what research says

Large meta-analyses agree that IQ predicts educational and occupational outcomes on average, with plenty of individual exceptions. Strenze (2007), pooling longitudinal studies, found corrected correlations of about .56 between intelligence and education, .43 with occupational level and .20 with income. For job performance, Schmidt and Hunter (1998) estimated a validity of about .51 for general mental ability; a 2022 re-analysis by Sackett and colleagues revised it to about .31, still useful but leaving most differences in performance to other factors such as experience, conscientiousness and job knowledge.

How does 120 look against real occupations? The table uses Wolfram’s (2023) estimates from the UK Understanding Society survey and assumes a typical spread of about 13 points inside each occupation (the study found only about a quarter of IQ variance lies between occupations). It shows how many people in each group would be expected to score below 120 — a reminder of how much occupations overlap.

Read more in average IQ by occupation. These are group estimates from a short test battery, not entry requirements.

Measurement error: how precise is a score of 120?

A full-length clinical test such as the WAIS-IV or WAIS-5 has very high reliability (internal consistency around .97–.98 for the full-scale IQ), which still leaves a standard error of measurement (SEM) of about 2–3 points; Pearson’s WAIS-5 sample report lists an FSIQ SEM of 3.00. A 95% confidence interval is roughly ±1.96 SEM, so a measured 120 is best read as about 114 to 126. Shorter tests have larger errors (SEM 4–5 or more), widening the band to roughly 111–129.

Extreme scores also tend to move toward the mean on re-testing (regression to the mean). With a reliability of .96, the best estimate of the “true” score behind an observed 120 is about 119.2, which is why many reports centre the confidence interval slightly below the obtained score.

What an IQ of 120 does not tell you

• It does not measure creativity, practical wisdom, emotional skills, motivation or character.
• It is a sample of performance on one day; sleep, stress, language and familiarity with tests all affect it.
• Index scores (verbal, spatial, reasoning, memory, speed) can differ widely behind the same full-scale number.
• It does not fix the future: correlations of .2 to .6 leave room for very different outcomes among people with the same score.
• It cannot be compared across very different tests or eras without adjusting for norms.

The Flynn effect and old norms

IQ is always relative to a norm group, and norm groups age. Because average raw performance rose by roughly 3 points per decade for much of the 20th century (Flynn effect; Trahan et al., 2014), an outdated test makes everyone look better. Scored on norms 15 years old, a 120 might correspond to about 116 on fresh norms. Gains have slowed and even reversed in some countries such as Norway (Bratsberg & Rogeberg, 2018), so the size of the effect is not fixed.

Online IQ tests and a score of 120

If your 120 came from a website or app, it may be off by 10 points or more. Unproctored tests, unknown norms, practice effects and flattering scoring are all common. Our own free IQ test is explicitly a rough estimate for fun; for a real number see the assessment section below and our article on online IQ tests.

How to get a proper IQ assessment

A valid IQ score comes from an individually administered, standardized test (for example the WAIS-5/WAIS-IV for adults, WISC-V for children, or Stanford-Binet 5) given by a licensed or registered psychologist. Expect 60–120 minutes of testing, a written report with index scores and confidence intervals, and a fee that varies by country and provider. Schools, university disability services, and clinical or neuropsychology services can refer you. Ask which test and which norms were used, and for the confidence interval, not just the single number.