IQ 83

83 is below the middle of the curve, but it is far from unusual. Around 8.7 million people in the UK would score 83 or lower on the same scale. It works out at 1.13 standard deviations under the mean, in the band this site calls Low Average.

A score in the low 80s 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.

Plenty of valuable skills are learned mainly through practice. Trades, care work, hospitality, sport, driving and music all reward repetition and experience, and people keep improving at them for decades.

A result in the low 80s 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.

A 83 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 78 to 88. That spans the 7.1st to the 21.2nd 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.

Your screen, your connection, background noise and interruptions all affect a timed test. A phone in a busy room is a very different test from a quiet desk.

Small day-to-day changes are enough to move a score around 83. A shift of 5 points, from 83 to 88, would move you from the 12.9th to the 21.2nd percentile, so it helps to know what causes those swings.

• Sleep. A short night reliably hurts working memory and attention, the two things timed puzzles lean on hardest.
• Stress and mood. Worry takes up working memory. People who feel anxious about tests often score below their usual level.
• 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.

On a bell curve with a mean of 100 and a standard deviation of 15, about 13% of people score 83 or lower. Applied to whole populations:

About 13% of people score 83 or lower, compared with 7.1% at 78 or lower and 21% at 88 or lower. Five points here changes the share by about 8 percentage points.

What your 83 could really be. Even a good supervised test has a margin of error of roughly 5 points either side. A true score anywhere from 78 to 88 would be consistent with a 83, which spans the 7.1st to the 21.2nd 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 83 stands as it is. If the report used SD 16 it equals about 84, and if it used SD 24 about 89. 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 83. 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 83 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 83 typically score about 790 on the SAT and about 13 on the ACT composite. Scores vary a lot from person to person, so the range shows where about four in five land.