IQ 183
An IQ of 183 is higher than almost everyone: about 1 in 63 million.
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- 99.999th
- Percentile, at least
- 1 in 63 million
- Score 183 or higher
- Profoundly Gifted
- Classification
On the standard scale that is 5.53 standard deviations above average. No test has been checked against enough people to confirm a score this high.
An IQ of 183 falls in the profoundly gifted IQ range, which starts at 160. Find 183 on the IQ chart, or check how rare any score is with the IQ rarity calculator.
IQ 183: beyond what most tests can measure
A 183 is 23 points past the ceiling most major tests publish. The model rarity, about 1 in 63 million, describes about 130 people worldwide, which is far beyond anything a test has been checked against.
Major individually administered adult tests typically report full-scale scores up to about 160. A reported number above that usually comes from extended norms, a different scale or extrapolation.
Real populations may not follow the bell curve perfectly in the far tails, so rarity figures this extreme are illustrations, not head counts.
How claims like "183 IQ" arise
Most very high numbers you see online come from one of a few sources, and knowing which one produced a 183 tells you how much weight to put on it.
- Ratio IQ. Early childhood tests divided mental age by real age. A 6-year-old solving puzzles like a typical 11-year-old got a ratio IQ of 183. Modern deviation IQs do not work this way.
- Historiometric estimates. Researchers such as Catharine Cox (1926) estimated IQs for famous people from biographies. Some of her adjusted estimates went above 200. They are educated guesses, not test results.
- Unnormed online quizzes. A test with no norm data can print any number. Very high outputs usually say more about the scoring than the person.
Famous estimates: Newton, da Vinci and the 160+ club
Isaac Newton and Leonardo da Vinci are usually given estimates of 160 or more, and they are among 42 such profiles here. Only 3 go as high as 183. All are judgements from biographies, not test results.
Estimates this high mostly reflect how extraordinary the achievement was. That is a different thing from how someone would perform on a timed reasoning test.
How many people have an IQ of 183 or higher?
If IQ follows the standard bell curve, 0.0000016% of people score 183 or higher. Here is what that share means across whole populations:
| Where | Population | IQ 183+ |
|---|---|---|
| UK | 68 million | 1 |
| US | 335 million | 5 |
| World | 8.1 billion | 130 |
You would need the whole UK to expect about one person at 183 or higher.
Exactly 183, counting anyone between 182.5 and 183.5, is about 1 in 170 million. In the US that is about 2 people, and in the UK fewer than one person.
These are model estimates: a bell curve applied to whole populations, including children, rounded. They are not census counts, and real test norms differ a little from one test to another.
How rare is an IQ of 183?
Compare the neighbours: 178 or higher is about 1 in 10 million, 183 or higher is 1 in 63 million, and 188 or higher is 1 in 450 million. Each point up here adds roughly 47% to the rarity.
What your 183 could really be. No test is precise this far out. Even a 5-point error band, from 178 to 188, spans a rarity gap of about 45 times, so the exact number matters much less than "very far above average".
Which scale was it on? Most modern tests use a standard deviation of 15, which is what this page assumes. If your 183 came from a test using an SD of 16, it is about 178 on the SD 15 scale. From an SD 24 scale, used by some Cattell-style reports, it is about 152.
Famous people with an estimated IQ near 183
Nobody famous has a verified IQ in most cases, and retrospective estimates are only made for a narrow group.
The estimates on our historical profiles run from 115 to 250, so none lands close to 183. Historians only estimate IQs for people who did something extraordinary, which skews the list. It says nothing about what famous people could actually score.
See all historical IQ estimates or all fictional character IQs.
183 compared with nearby scores
How 183 stacks up against the scores just around it and the round numbers people usually ask about. Each score links to its own page.
| IQ | Classification | Percentile | Score higher |
|---|---|---|---|
| IQ 100 | Average | 50th | 50% |
| IQ 110 | High Average | 74.8th | 25% |
| IQ 120 | Superior | 90.9th | 9.1% |
| IQ 130 | Gifted | 97.7th | 2.3% |
| IQ 140 | Gifted | 99.62nd | 0.38% |
| IQ 150 | Genius | 99.96th | 0.043% |
| IQ 178 | Profoundly Gifted | >99.999th | 0.00001% |
| IQ 182 | Profoundly Gifted | >99.999th | 0.0000023% |
| IQ 183 | Profoundly Gifted | >99.999th | 0.0000016% |
| IQ 184 | Profoundly Gifted | >99.999th | 0.0000011% |
| IQ 188 | Profoundly Gifted | >99.999th | 0.00000022% |
Questions about an IQ of 183
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What does an IQ of 183 mean?
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Is your IQ above 183?
See where you land next to 183 with 25 visual reasoning questions.
25 questions · about 12 minutes
Percentiles and counts use a normal distribution with mean 100 and standard deviation 15. Real tests have their own norms, confidence intervals and ceilings, so treat every figure here as an approximation, not a diagnosis. Two tests often give different numbers for the same person: here is why.
By the LifeScore Editorial Team. Reviewed October 2026. Editorial policy