IQ 199
An IQ of 199 is higher than almost everyone: about 1 in 48 billion.
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- 99.999th
- Percentile, at least
- 1 in 48 billion
- Score 199 or higher
- Profoundly Gifted
- Classification
That is 39 points beyond the ceiling most major tests publish, so the number itself is less certain than its rarity suggests.
An IQ of 199 falls in the profoundly gifted IQ range, which starts at 160. Find 199 on the IQ chart, or check how rare any score is with the IQ rarity calculator.
IQ 199: beyond what most tests can measure
Taken literally, the bell curve puts 199 at 1 in 48 billion: not even one person in the UK and fewer than one person in the entire world. Treat that as an illustration of the model rather than a head count.
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 "199 IQ" arise
A 199 almost never comes from a modern, supervised adult test. It usually comes from somewhere like this:
- Ratio IQ. Early childhood tests divided mental age by real age. A 6-year-old solving puzzles like a typical 11.9-year-old got a ratio IQ of 199. Modern deviation IQs do not work this way.
- Different scales. Some tests use a standard deviation of 24, so a 199 there is about 162 on the usual SD 15 scale.
- 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
Nobody in history has a measured IQ of 199. The highest estimates on this site, for figures such as Isaac Newton and Leonardo da Vinci, come from reading their work and lives, not from tests. 42 profiles here are estimated at 160 or more.
As far as anyone knows, Albert Einstein never took an IQ test. The 160 figure repeated online is an estimate. See the Einstein profile for what it rests on.
How many people have an IQ of 199 or higher?
If IQ follows the standard bell curve, 0.0000000021% of people score 199 or higher. Here is what that share means across whole populations:
| Where | Population | IQ 199+ |
|---|---|---|
| UK | 68 million | fewer than one (effectively zero expected) |
| US | 335 million | fewer than one (effectively zero expected) |
| World | 8.1 billion | fewer than one (0.17 expected) |
Even across the whole world of 8.1 billion people, the bell curve predicts fewer than one person at 199 or higher.
Exactly 199, counting anyone between 198.5 and 199.5, is about 1 in 110 billion. In the US that is fewer than one person, and in the UK fewer than one person.
The figures are bell curve estimates for whole populations, children included, and rounded. Real tests are normed separately and will differ a little.
How rare is an IQ of 199?
Compare the neighbours: 194 or higher is about 1 in 5.4 billion, 199 or higher is 1 in 48 billion, and 204 or higher is 1 in 480 billion. Each point up here adds roughly 57% to the rarity.
What your 199 could really be. At this height the margin of error is wide. Just 5 points either way, 194 or 204, changes the model rarity from 1 in 5.4 billion to 1 in 480 billion, which shows how fragile such numbers are.
Which scale was it on? Most modern tests use a standard deviation of 15, which is what this page assumes. If your 199 came from a test using an SD of 16, it is about 193 on the SD 15 scale. From an SD 24 scale, used by some Cattell-style reports, it is about 162.
Famous people with an estimated IQ near 199
Estimates this high are reserved for a small group of scientists, artists and thinkers. These sit near 199. Every figure below is a retrospective estimate, not a measured score. Open a profile to see the evidence and how confident anyone can be.
- William James Sidis' IQ (estimated 250): Child Prodigy & Writer, 20th Century. 51 points above IQ 199.
See all historical IQ estimates or all fictional character IQs.
199 compared with nearby scores
Nearby scores and the round-number landmarks, so you can see how quickly the percentile changes around 199. Every row links to that score's 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 194 | Profoundly Gifted | >99.999th | 0.000000019% |
| IQ 198 | Profoundly Gifted | >99.999th | 0.0000000032% |
| IQ 199 | Profoundly Gifted | >99.999th | 0.0000000021% |
| IQ 200 | Profoundly Gifted | >99.999th | 0.0000000013% |
Questions about an IQ of 199
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Is your IQ above 199?
See where you land next to 199 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