IQ 61

On the standard scale, 61 sits 39 points under 100. You scored higher than 0.47% of people, and about 1 in 215 people score at this level or lower. It sits 9 points below 70. The label for this part of the curve is 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.

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.

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.

Online scores are estimates with wide error bars. For 61, a 5-point window either way runs from about 56, where 1 in 596 score that low or lower, to 66, where it is 1 in 85.

Professional assessments combine several subtests (verbal, visual, memory and speed) and look at the pattern between them, not just one total. A single online total cannot show that pattern.

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 61. A shift of 5 points, from 61 to 66, would move you from the 0.47th to the 1.2nd 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.
• 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, 0.5% of people score 61 or lower. Here is what that share means across whole populations:

Scoring 61 or lower is about 1 in 215. At 66 or lower it becomes 1 in 85, and at 56 or lower 1 in 596, which shows how quickly the curve fills up towards the middle.

What your 61 could really be. Treat any single score as the centre of a range. For a good supervised test, about 5 points either side is typical, so 61 really means somewhere from 56 to 66. Online tests are less precise than that.

Which scale was it on? A 61 reported on an SD 16 scale converts to about 63 on the usual SD 15 scale, and one from an SD 24 scale (seen in some Cattell-style results) to about 76. Check which scale your score report used.

Nobody famous has a verified IQ in most cases, and retrospective estimates are only made for a narrow group.

No historical figure on this site has an estimate close to 61. Retrospective estimates cluster between about 115 and 250 because they are only made for people with exceptional achievements. That is a selection effect, not a sign that famous or successful people cannot score 61.

How 61 stacks up against the scores just around it and the round numbers people usually ask about. Each score links to its own page.