IQ 56

56 is below the middle of the curve, but it is far from unusual. Around 110,000 people in the UK would score 56 or lower on the same scale. It works out at 2.93 standard deviations under the mean, in the band this site calls Below Average.

A score under 70 on a single online test does not mean anything clinical. Only a qualified professional, such as a clinical or educational psychologist, can assess that, using supervised tests and a look at everyday functioning.

IQ tests measure a narrow slice of thinking: spotting patterns, holding rules in mind and working fast under time pressure. They do not measure practical skill, kindness, reliability, craft or creativity, which are the things most people notice about you day to day.

A result in this range 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.

Think of 56 as the middle of a window. On a second attempt the same person could plausibly land at 61, which is higher than 0.47% of people, or at 51. That is before counting the extra noise an unsupervised online test adds.

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.

Reading level matters as well. If the instructions or questions lean on vocabulary, anyone reading in a second language is at a disadvantage that has nothing to do with reasoning.

Small day-to-day changes are enough to move a score around 56. A shift of 5 points, from 56 to 61, would move you from the 0.17th to the 0.47th 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.
• 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.
• Timing and comfort. Hunger, a headache or testing late at night can all pull a score down on the day.

If IQ follows the standard bell curve, 0.2% of people score 56 or lower. Here is what that share means across whole populations:

Scoring 56 or lower is about 1 in 596. At 61 or lower it becomes 1 in 215, and at 51 or lower 1 in 1,838, which shows how quickly the curve fills up towards the middle.

What your 56 could really be. Even a good supervised test has a margin of error of roughly 5 points either side. A true score anywhere from 51 to 61 would be consistent with a 56, which spans the 0.05th to the 0.47th percentile. Short online tests have wider margins.

Which scale was it on? Most modern tests use a standard deviation of 15, which is what this page assumes. If your 56 came from a test using an SD of 16, it is about 59 on the SD 15 scale. From an SD 24 scale, used by some Cattell-style reports, it is about 73.

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 56. 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 56 stacks up against the scores just around it and the round numbers people usually ask about. Each score links to its own page.