IQ 75

75 is below the middle of the curve, but it is far from unusual. Around 3.2 million people in the UK would score 75 or lower on the same scale. It works out at 1.67 standard deviations under the mean, in the band this site calls Below Average.

A score in the 70s on one online test is not a diagnosis of anything. Only a qualified professional, such as a clinical or educational psychologist, can assess anything clinical, and they never rely on a single number.

A result in the 70s often reflects the test as much as the person. Timed abstract puzzles are unfamiliar to many adults, especially anyone who left education a while ago or who learned in a different language.

Retest gains of a few points are well documented once a format is familiar. First attempts at any unfamiliar kind of test tend to be the least representative.

A 75 from one online test is best read as a range, not a point. Even a well-built, supervised test has a margin of error of roughly 5 points either side, so the same person could reasonably score anywhere from about 70 to 80. That spans the 2.3rd to the 9.1st percentile.

Online tests are not normed the way clinical tests are. Their scores are estimates, and the people who take them are not a representative sample of the population.

Time limits matter. Some people reason accurately but slowly, and a short, timed test turns that into a lower number than an untimed task would.

The same person can score 70 one week and 80 the next. Most of that swing comes from the conditions on the day rather than any change in ability:

• Sleep. A short night reliably hurts working memory and attention, the two things timed puzzles lean on hardest.
• Language. Questions that rely on words or written rules favour native speakers. Visual puzzles reduce this effect but do not remove it.
• Familiarity. People who have seen matrix-style puzzles before tend to do better on them. That is a practice effect, not a change in underlying ability.

Scoring 75 or lower is a 4.8% share of everyone. Scaled up to whole populations, that works out as:

About 4.8% of people score 75 or lower, compared with 2.3% at 70 or lower and 9.1% at 80 or lower. Five points here changes the share by about 4 percentage points.

What your 75 could really be. Even a good supervised test has a margin of error of roughly 5 points either side. A true score anywhere from 70 to 80 would be consistent with a 75, which spans the 2.3rd to the 9.1st percentile. Short online tests have wider margins.

Which scale was it on? Score reports do not always say. On the common SD 15 scale your 75 stands as it is. If the report used SD 16 it equals about 77, and if it used SD 24 about 84. The percentile follows the converted number.

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 75. Historians only estimate IQs for people who did something extraordinary, which skews the list. It says nothing about what famous people could actually score.

How 75 stacks up against the scores just around it and the round numbers people usually ask about. Each score links to its own page.

People with an IQ of 75 typically score about 710 on the SAT and about 12 on the ACT composite. Scores vary a lot from person to person, so the range shows where about four in five land.