IQ 155

155 is 3.67 standard deviations above average, in the range usually called highly gifted. Only about 1 in 8,137 people score this high or higher. It sits 10 points past the 145 mark and 5 short of 160. This site labels scores from 145 as genius, but that is an informal label, not a clinical category.

Highly gifted is mostly an education term. For a child it usually signals needing more than standard enrichment, such as acceleration or specialist teaching.

The Triple Nine Society's top 0.1% line is about 146 on this scale, and 155 clears it. As with any society, membership needs a supervised test, not an online result.

There is no single experience of a 155. The points below are patterns often described by people in this range and by those who teach them, not a checklist.

• Complex ideas can click after one explanation, which makes slow-paced teaching feel frustrating.
• In children, reasoning can run years ahead of age while emotional and physical development stay on schedule. Educators call this asynchrony.
• None of this is guaranteed. Many people at this level feel ordinary most of the time.

To check a score of 155, a test would need plenty of people at that level in its norm group. With a typical 2,200-person sample, it would expect less than one. That is why scores this high carry more uncertainty.

Short online tests, including ours, are best at telling you roughly where you are. Treat a 155 from one as "well above 140" rather than an exact figure.

Online scores this high deserve extra caution. Short tests have few very hard questions, so luck on one or two of them can decide whether you see 150 or 155.

Scoring 155 or higher is a 0.012% share of everyone. Scaled up to whole populations, that works out as:

Going from 150 to 155 makes a score 3.5 times rarer, and going on to 160 multiplies the rarity by another 3.9. Near 155, each single point adds about 30% to the rarity.

What your 155 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 155 really means somewhere from 150 to 160. Online tests are less precise than that.

Which scale was it on? A 155 reported on an SD 16 scale converts to about 152 on the usual SD 15 scale, and one from an SD 24 scale (seen in some Cattell-style results) to about 134. Check which scale your score report used.

Scientists, composers and philosophers often receive estimates in this range. These sit near 155. Every figure below is a retrospective estimate, not a measured score. Open a profile to see the evidence and how confident anyone can be.

How 155 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 155 typically score about 1600 on the SAT and about 36 on the ACT composite. Scores vary a lot from person to person, so the range shows where about four in five land.