IQ 128

A 128 is higher than 96.9% of people. In the UK alone, roughly 2.1 million people would score this high or higher, and the gifted line at 130 is 2 points further up.

At this level the advantage is consistent rather than dramatic. Unfamiliar puzzles, dense reading and new systems are likely to feel a little easier for you than for most people around you.

Scores here are well within what standard tests measure precisely, so a 128 from a good, supervised test is a meaningful signal rather than noise.

A 128 does not point to one career. The more solid finding, from meta-analyses such as Schmidt and Hunter (1998), is that reasoning ability helps most in jobs with a lot of new information to absorb.

Fields that reward this profile include engineering, analysis, teaching, nursing, law, finance, software and skilled technical trades, where learning new material is part of the job.

If you are choosing a path, treat 128 as a reason to take on demanding material, not as a filter on which options are open to you.

At 128, the edge over average is 28 points. In everyday terms it is subtle and shows up in small ways:

• You tend to spot the pattern in a problem sooner, especially with numbers, diagrams or rules.
• New tools and apps feel intuitive faster, because you infer how they work.
• Long instructions are easier to hold in mind without writing them down.

If IQ follows the standard bell curve, 3.1% of people score 128 or higher. Here is what that share means across whole populations:

Compare the neighbours: 123 or higher is about 1 in 16, 128 or higher is 1 in 32, and 133 or higher is 1 in 72. Each point up here adds roughly 16% to the rarity.

What your 128 could really be. If you retook a well-made test, landing at 123 or at 133 would be unremarkable. That is the difference between beating 93.7% and 98.6% of people, and short online tests are noisier still.

Which scale was it on? Most modern tests use a standard deviation of 15, which is what this page assumes. If your 128 came from a test using an SD of 16, it is about 126 on the SD 15 scale. From an SD 24 scale, used by some Cattell-style reports, it is about 118.

Retrospective estimates for historical figures rarely go this low, because they are only made for people with exceptional achievements. A few sit near 128. Treat these as informed guesses from biographies rather than results. Each profile sets out what its estimate rests on.

A few degree, university and job profiles on this site carry IQ benchmarks close to 128. Treat the education figures as rough estimates from admissions-test data rather than measured IQs.

Nearby scores and the round-number landmarks, so you can see how quickly the percentile changes around 128. Every row links to that score's page.

People with an IQ of 128 typically score about 1390 on the SAT and about 29 on the ACT composite. Scores vary a lot from person to person, so the range shows where about four in five land.