IQ 79

79 is below the middle of the curve, but it is far from unusual. Around 5.5 million people in the UK would score 79 or lower on the same scale. It works out at 1.40 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.

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.

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 79 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 74 to 84. That spans the 4.2nd to the 14.3rd percentile.

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 79. A shift of 5 points, from 79 to 84, would move you from the 8.1st to the 14.3rd 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.
• 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 79 or lower is a 8.1% share of everyone. Scaled up to whole populations, that works out as:

The curve fills up quickly towards the middle. Moving from 79 to 84 adds about 6 percentage points of people at or below you, and moving down to 74 removes about 4.

What your 79 could really be. Even a good supervised test has a margin of error of roughly 5 points either side. A true score anywhere from 74 to 84 would be consistent with a 79, which spans the 4.2nd to the 14.3rd 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 79 came from a test using an SD of 16, it is about 80 on the SD 15 scale. From an SD 24 scale, used by some Cattell-style reports, it is about 87.

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 79. 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 79 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 79 typically score about 740 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.