The Rarest and Most Common Personality Types, and Where Those Numbers Come From

INFJ is the type most often named as the rarest, and the figure behind that claim comes from the company that publishes the official four-letter instrument. Its own article on the question states that people who prefer INFJ make up only 1.5 percent of the general population in the United States. ENTJ follows at 1.8 percent and INTJ at 2.1 percent.

At the other end, the types usually described as most common are ISFJ and ISTJ, with ESFJ and ESTJ close behind. Those names are repeated everywhere, but the percentages attached to them are much harder to trace to a source you can open and read, which is a difference worth knowing before you quote one.

So the honest version of the answer is two sentences long. The rare end of the table has a publisher-stated figure behind it. The common end has a widely circulated figure of roughly 13.8 percent for ISFJ that appears on dozens of sites without a primary source any of them links to.

The publisher's article names three United States sources behind its figures: the Center for Applications of Psychological Type, with roughly 900,000 people assessed over about twenty years; the Myers-Briggs Company's own nationally representative sample of around 5,000 people; and a Stanford Research Institute sample of about 1,000. The underlying reference tables appear in the instrument's technical manual, where the United States national representative sample is around 3,000 adults.

That is a real evidence base and it has real limits. It is United States only, so none of these percentages should be applied to another country without checking. It is also historical: the large archival sample accumulated over two decades from people who were given the instrument at work, at college, or in counseling, which is not the same as a random slice of the public.

Most importantly, no census of personality types exists and none is possible in the way the question implies. A percentage here describes how a particular questionnaire sorted a particular group of people on a particular day. Rerun the same people months later and some of them land in a different box, which is a measurement property rather than a change in who they are.

There is a commercial reason for the gap. Rarity is the interesting claim, so the publisher wrote an article about the least common type and put the numbers in it. The full table of estimated frequencies for all sixteen types sits in paid manuals and professional materials rather than on an open page, so the common-end figures reach the public through third parties who rarely say which edition they took them from.

This is why the same four or five percentages circulate endlessly with small variations. One site gives ISTJ a range of 11 to 14 percent, another gives a single figure, a third attributes the identical number to a different organization entirely. When numbers drift like that across sources without a citation, the drift itself is the finding.

Psychology.com's 16 Personalities Test produces its own result distribution, and we are not publishing it here as a population estimate. Our test takers are people who chose to search for a personality test, which makes them a self-selected group rather than a sample of adults. Presenting that distribution as a frequency table would be exactly the mistake this page is describing.

The publisher's figures are reported by sex as well as overall, and the split matters. INFJ is 1.6 percent of women and 1.3 percent of men, which is why it holds the overall rarest position: it is uncommon in both groups. The other two rare results are lopsided. ENTJ is 2.7 percent of men and 0.9 percent of women. INTJ is 3.3 percent of men and 0.8 percent of women.

So the sentence most people are looking for is not really about one type. Among women, the rarest results are the thinking and intuition combinations, INTJ and ENTJ. Among men, ENFJ sits near the bottom at 1.6 percent. If someone tells you their type is rare, the follow-up question is rare among whom.

The sex differences in these tables also track a known pattern in trait research: the feeling and thinking axis correlates with measured agreeableness, which differs on average between men and women in large samples. The type figures are picking up something real about how people answer, and they are not evidence that any type belongs to anyone.

Free online tests report distributions that lean heavily toward introverted and intuitive results, often putting INFP or INFJ among the most common rather than the rarest. That is not a contradiction of the publisher's figures. It is selection. The people who look up a personality test are disproportionately the people who enjoy thinking about their own inner life, and that is close to a description of the IN results.

Two other things inflate the same end of the table. Rare-sounding results get shared more, so they are overrepresented in anything measured from social media. And some questionnaires are written with more items about reflection and meaning than about practical detail, which nudges answers toward N regardless of who is taking it.

The practical upshot: when you see a frequency chart, look for whose data it is. A chart built from a general population sample and a chart built from website visitors are answering two different questions, and only one of them is about the population.

Rarity is the single most shareable thing about a type result, which is why it leads so many pages about it. It flatters, it feels like information, and it converts a questionnaire output into something closer to an identity. None of that makes it meaningful.

A rarity figure cannot tell you anything about how capable, perceptive, kind or compatible someone is. The publisher of the official instrument states plainly that the assessment does not measure ability, competence or skill. A result occurring in 1.5 percent of a sample and a result occurring in 13 percent of a sample are equally uninformative about what the person holding it can do.

Rarity also cannot do the thing people most often want from it, which is to explain why they feel out of step. Feeling misunderstood is common across all sixteen results and has far more to do with circumstances, how directly needs get stated, and whether the people nearby are a good fit than with how many others share your four letters.

There is one legitimate use for the frequency tables. If you work in a field dominated by one pattern, knowing you are in a small minority of it can explain friction that otherwise looks personal. That is a fact about the room you are in, not about your rank in a population.

The four intuition and thinking results are INTJ, the Architect; INTP, the Logician; ENTJ, the Commander; and ENTP, the Debater. Two of them, INTJ and ENTJ, sit in the rarest three on the publisher's figures, which has given this group an outsized reputation for scarcity that the INTP and ENTP numbers do not support.

The four intuition and feeling results are INFJ, the Advocate; INFP, the Mediator; ENFJ, the Protagonist; and ENFP, the Campaigner. INFJ holds the overall rarest position in population estimates and is simultaneously one of the most common results on free online tests, which is the clearest single illustration of how much the sample matters.

The four sensing and judging results are ISTJ, the Logistician; ISFJ, the Defender; ESTJ, the Executive; and ESFJ, the Consul. This is the group generally described as most common, and the one whose percentages are hardest to verify from an open source.

The four sensing and perceiving results are ISTP, the Virtuoso; ISFP, the Adventurer; ESTP, the Entrepreneur; and ESFP, the Entertainer. These results are substantially underrepresented in online personality communities relative to the population estimates, for the selection reasons described above rather than because there are few of them.

The four-letter framework is a popular typology with limited test-retest reliability and no strong evidence that it predicts real-world outcomes. McCrae and Costa's 1989 reanalysis found that the traits underneath behave like continuous dimensions rather than the either-or categories the letters imply, which undercuts the premise of a frequency table: if the underlying scores are spread along a curve, the share of people in a box depends mainly on where you put the cut.

Pittenger's 2005 review found no strong evidence that a four-letter result forecasts performance, career success or relationship outcomes. The 2017 systematic review by Randall, Isaacson and Ciro, by contrast, concluded that the instrument's construct validity is reasonable and its test-retest reliability acceptable on three of the four subscales, with Thinking and Feeling lower, while noting the limits of the evidence; what neither disputes is that people recognize themselves in the descriptions. A meaningful share of people who retake the instrument weeks later receive a different four-letter result.

Taken together, that is why this page treats the percentages as publisher estimates worth reporting accurately rather than as facts about how many people exist of each kind. The figures are honest about what they are. The rarity industry built on top of them is not.

Psychology.com's free 16 Personalities Test takes a few minutes and reports where you fall on each of the four axes rather than only handing back four letters, which is the more informative output. An optional in-depth report is available for readers who want a longer write-up. The test is inspired by Jungian typology and the Big Five and is separate from the official instrument published by the Myers and Briggs organizations.

Once you have a result, the useful next step is not the ranking. It is the description: read your own type page, then read the neighbor that differs by one letter, and see which paragraphs land. If you want to see how the sixteen fit together first, the 16 personality types index lays out the four axes and every result.