IQ 159

159 sits 14 points past the three standard deviation mark and 1 below 160, where most tests top out. You would outscore 99.996% of people.

At this height one or two answers matter a lot. Many tests have only a handful of very hard items separating 145 from 160, so a single extra correct answer can move the score several points.

Highly gifted is mostly an education term. For a child it usually signals needing more than standard enrichment, such as acceleration or specialist teaching.

What does a 159 feel like? Nobody can say for a specific person, but these themes come up in accounts from this range:

• It can be hard to judge what is obvious to other people, so explaining clearly takes practice.
• Perfectionism and overthinking come up often in first-hand accounts.
• None of this is guaranteed. Many people at this level feel ordinary most of the time.

Major adult tests are normed on samples of a couple of thousand people. In a 2,200-person norm sample, the bell curve expects about 0.1, less than one person, at 159 or higher, so the top of the scale rests partly on extrapolation.

Margins of error widen at the extremes, so a reported score here is less precise than the roughly 5 points either side that is typical near the middle.

Online scores this high deserve extra caution. Short tests have few very hard questions, so luck on one or two of them can decide whether you see 154 or 159.

If IQ follows the standard bell curve, 0.0042% of people score 159 or higher. Here is what that share means across whole populations:

Going from 154 to 159 makes a score 3.8 times rarer, and going on to 164 multiplies the rarity by another 4.2. Near 159, each single point adds about 32% to the rarity.

What your 159 could really be. If you retook a well-made test, landing at 154 or at 164 would be unremarkable. That is the difference between beating 99.98% and 99.999% of people, and short online tests are noisier still.

Which scale was it on? A 159 reported on an SD 16 scale converts to about 155 on the usual SD 15 scale, and one from an SD 24 scale (seen in some Cattell-style results) to about 137. Check which scale your score report used.

Scientists, composers and philosophers often receive estimates in this range. These sit near 159. Treat these as informed guesses from biographies rather than results. Each profile sets out what its estimate rests on.

Nearby scores and the round-number landmarks, so you can see how quickly the percentile changes around 159. Every row links to that score's page.

People with an IQ of 159 typically score about 1600 on the SAT and about 36 on the ACT composite. Scores vary a lot from person to person, so the range shows where about four in five land.