Enneagram and MBTI: is there a correlation, and is every INFP a 4? What the research says

Charts that pair each MBTI type with an Enneagram number are all over social media and blogs: “INFP = 4w5,” “INTJ = Type 5.” If you have taken both tests, you have probably checked whether your results match the chart, and if you only know your four letters, it is tempting to look up your number. But if the Enneagram test calls you a Type 9 even though you are an INFP, or a friend who shares your type gets a completely different number, you may start to wonder whether the charts mean anything.

The short answer: the two systems measure different things. The MBTI turns four preferences into letters; the Enneagram describes nine types by their core motivations and fears. No research backs a chart that gives each MBTI type its own number. Some links do show up in studies. Translated into MBTI letters, research comparing the Enneagram with the Big Five puts Type 5s nearer Introversion (I) and Thinking (T), and Type 2s nearer Extraversion (E) and Feeling (F). But the links are partial, and people of any one Enneagram type are most likely spread across many MBTI types. Even the classic “INFP = 4” pairing is shaky: in both type-by-type Big Five studies, Type 4s were no more introverted than anyone else.

This guide covers what each system measures, the studies that gave people both tests or compared the Enneagram with the Big Five, and what those findings look like in MBTI letters. The last sections explain how to read an MBTI-to-Enneagram chart with a critical eye and how to line up your own two results on mind.io.

The MBTI describes what feels natural to you through four preferences. On each of four axes, Extraversion-Introversion (E–I), Sensing-Intuition (S–N), Thinking-Feeling (T–F) and Judging-Perceiving (J–P), you lean one way or the other, and the four leanings together name one of 16 types. The axes are scored separately, so you can lean hard on one and sit near the middle on another.

The Enneagram describes nine types by the core motivation and fear beneath behavior rather than by the behavior itself. You get one main type, usually with a wing. On mind.io, the wing is whichever of the two numbers next to your type on the circle scored higher, so a Type 4 comes out as 4w3 or 4w5. Each type’s motivations are described in our guide to the nine Enneagram types.

So the two systems are built differently: one has four independent axes with two ends each, the other nine types arranged around a circle. A Korean paper comparing the two theories concluded that the 16 MBTI types and the nine Enneagram types do not map onto each other, and that each tries to measure something different (Hwang, 2005). Guessing one result from the other would take research that links them.

A handful of studies, mostly from the 1980s and 1990s, gave the same people the MBTI and an Enneagram measure. One of them recruited 390 adults and college students (311 women and 79 men) who had learned the Enneagram in workshops and classes well enough to type themselves, and gave them the MBTI and one other personality inventory. The authors reported that the Enneagram types had significantly different MBTI profiles, and that the differences fit the theory (Wagner & Walker, 1983). The abstract does not say which type leaned toward which letters or by how much, and we could not read the full text.

Other early studies reached similar conclusions. A doctoral dissertation gave Enneagram scales and the MBTI to 117 people who said they knew their type; it reported concurrent validity, meaning the two sets of scores related as expected (Thrasher, 1994, as cited in Scott, 2011). Another, using an inventory built by the Enneagram author Helen Palmer, compared the results after the fact, without hypotheses set in advance, and found them consistent (Palmer, 1988, as cited in Scott, 2011). Reviewing these studies, Scott pointed out a weakness: they treated each person’s own choice of type as the right answer, and people who believe in their type may answer to fit its description, which can inflate agreement. Scott also noted that such studies cannot show whether the nine types are really distinct from one another (Scott, 2011). In November 2026 we searched the OpenAlex and Crossref research databases and the Korean database RISS and found no recent journal article that gave the same people both tests and reported how each Enneagram type splits across MBTI types.

More numbers exist for the Enneagram and the Big Five. A systematic review of 104 samples found mixed evidence for the Enneagram’s reliability and validity, but noted that its subscales relate to other traits such as the Big Five in the ways the theory predicts; the abstract says nothing about the MBTI (Hook et al., 2021, from the abstract). A study that gave a widely used Enneagram test, the RHETI, to 287 people and compared it with a Big Five inventory found mixed support for its construct validity (Newgent et al., 2004, from the abstract and Scott, 2011).

Two studies reported results type by type. Anna Sutton gave a Big Five questionnaire to 416 people who had settled on their type in a week-long intensive course or at least three weekend courses (75% women, mostly British or American) and compared each type with the rest of the group; 21 of the 28 predictions held up (Sutton, 2007). A Turkish online study of 3,531 people, 91.3% of them women, correlated scores on nine Enneagram type scales with Big Five scores (Yanartaş et al., 2022). One study used the types people had settled on in courses, the other questionnaire scale scores, yet for several types the results pointed the same way. The next section translates them into MBTI letters.

Since few numbers link the MBTI and the Enneagram directly, the Big Five can serve as a bridge. McCrae and Costa reported that the four MBTI scales partly measure four of the five Big Five dimensions (McCrae & Costa, 1989). When a later team gave both tests to 900 people, Extraversion-Introversion lined up with extraversion, Sensing-Intuition with openness, Thinking-Feeling with agreeableness and Judging-Perceiving with conscientiousness (Furnham et al., 2003). Neuroticism, the tendency to feel negative emotions such as worry and tension easily, has no MBTI scale at all. The mind.io Big Five test calls it Emotional sensitivity.

Carried across that bridge, these are the links that showed up in both studies. Type 2 went with higher extraversion and agreeableness, which points to E and F; Type 3 with higher extraversion and conscientiousness, E and J; Type 7 with higher extraversion and openness, E and N; Type 8 with higher extraversion, E; Type 1 with higher conscientiousness, J; and Type 9 with higher agreeableness and lower openness, F and S. Type 5 went with lower extraversion and agreeableness, which points to I and T, and Type 6 with lower extraversion, I. Type 4 went with higher openness and slightly higher agreeableness, which points to N and F, but in neither study did Type 4s differ from other types on extraversion.

How strong are these links? In the Turkish study, the largest correlations were 0.62 between Type 1 and conscientiousness, 0.57 between Type 2 and agreeableness and 0.50 between Type 8 and extraversion. Even with a link that size, plenty of Type 8s would not be especially outgoing. The links behind “INTJ = 5” were small: Type 5 correlated −0.23 with extraversion and −0.16 with agreeableness. On average, Type 5s may lean a little toward I and T, but extraverted or feeling Type 5s are entirely possible. In the Turkish study, Type 6’s lean toward I, Type 9’s toward F and Type 2’s toward E rested on links just as small, and Type 9’s lean toward S on an even smaller one.

One of the clearer differences between Enneagram types lies in neuroticism, which the MBTI leaves out. In both studies, Type 4 and Type 6 went with lower emotional stability, meaning worry and tension come more easily, and Type 7 with higher. In the Turkish study, emotional stability correlated −0.37 with Type 4, the largest of Type 4’s Big Five links, and 0.40 with Type 7. If two people with the same four letters come out as a 4 and a 7, part of the difference may lie where the MBTI does not look.

Back to INFP and Type 4: the findings fit a lean toward N and F, but nothing in them supports a lean toward I. And the whole guess crosses two bridges, neither of them sturdy. The MBTI letters and the Big Five traits only partly overlap, and most of the Enneagram–Big Five correlations in the Turkish study were below 0.5. Chaining the two leaves an even weaker link. People of the same Enneagram type are likely spread across many MBTI types, so it is hard to guess your number from your four letters.

First, most charts show no data. It is hard to find one that says how many people took both tests, how their types were decided or how the results split. Even a chart with numbers is hard to take at face value if it comes from an online poll of people who already know both systems: as Scott warned about the older studies, people who have read their type’s description may answer to match it.

Second, the same behavior can have different reasons behind it. Planning a trip down to the hour looks like Judging (J) in MBTI terms. The Enneagram asks why: to get everything right (Type 1), to come across as capable (Type 3) or to be ready if something goes wrong (Type 6). A chart skips the reason and hands out a number based on the surface.

Third, results near a cutoff flip easily in both systems. The MBTI measures four fairly independent dimensions rather than truly distinct types (McCrae & Costa, 1989), so an axis near 50:50 can change letter when you retest. On mind.io’s Enneagram test, moving one answer by one step shifts that type’s score by 5 points, and it is not unusual for the top two types to land within 5 points of each other. The wing, the higher-scoring of two neighboring numbers, flips even more easily, and research supporting wings is thin (Hook et al., 2021, from the abstract). A label like “INFP 4w5” stacks six calls (four letters, a main type and a wing), and one close call is enough to change the pairing. Our guide to MBTI accuracy and guide to Enneagram accuracy explain why.

Fourth, type descriptions fit almost everyone a little. A line like “calm on the outside, with deep feelings few people ever see” sounds right in an INFP profile and in a Type 4 profile alike. The tendency to accept descriptions that would fit nearly anyone is called the Barnum effect. Feeling at home in both descriptions does not mean the two systems measure the same thing.

Rather than looking up your number on a chart, take both tests and see your own results. On mind.io, the Enneagram test (45 statements, about 6 minutes) and the MBTI test (32 statements, about 4 minutes) are both free.

The Enneagram test asks about each of the nine types with five statements, 45 in all, written by mind.io. For each type, three statements are scored as written, and two describe the opposite of that type and are scored in reverse. Each type’s five answers are added up and placed on a 0–100 scale, where the lowest possible total is 0 and the highest is 100, and the type with the highest score is your type; a tie goes to the lower number. The result page shows all nine scores. When the top two are 5 points or less apart, it names both as candidates and asks three reflection questions comparing their core motivations, fears and more. The wing is whichever of your type’s two neighbors scored higher; if both neighbors tie, both are shown.

The MBTI result shows how far you lean on each of the four axes, in percent. No combo card puts the two results on one screen, so open both result pages side by side and compare them yourself. If an axis is close to 50%, that letter could change next time, and if your top two Enneagram types are close, both descriptions are worth reading. Then set your pair against the links above: if you came out as a Type 5, do you lean I? If you are a Type 2, do you lean E and F? It is fine if you do not. What holds on average need not hold for you.

The Enneagram is ultimately about why. Read the core fear of your top two types and ask yourself which reaction feels more familiar when you are under stress. Your four MBTI letters cannot answer that question.

If you are curious about neuroticism, which the MBTI leaves out, check your Emotional sensitivity score in the Big Five test as well. In the studies above, it was one of the traits that set Types 4 and 7 furthest apart.

All the tests in this guide are tools for self-reflection, not diagnoses. The mind.io MBTI test is not the official MBTI (Myers-Briggs Type Indicator); it is a free MBTI-style test built around the same four preference axes. The Enneagram test is a self-reflection tool built from mind.io’s own statements, and the Enneagram itself grew out of a self-reflection tradition: it is not a measurement tool validated by research the way the Big Five is.

Please do not use a number or four letters as a label for judging someone else. Deciding “they’re an INTJ, so they must be a 5” makes it harder to hear what that person actually wants and fears. The two results are most useful as questions that open a conversation.

References: Wagner & Walker (1983), Journal of Clinical Psychology 39(5), 712-717, https://doi.org/10.1002/1097-4679(198309)39:5<712::AID-JCLP2270390511>3.0.CO;2-3 (from the abstract); Scott (2011), An analysis of the validity of the Enneagram, doctoral dissertation, College of William and Mary, https://doi.org/10.25774/w4-b0e9-4630; Thrasher (1994), The Enneagram: movement between types, an inventory, and a criterion measure, doctoral dissertation, Loyola University (cited in Scott, 2011); Palmer (1988), The Enneagram: understanding yourself and the others in your life, San Francisco: Harper Collins (book, cited in Scott, 2011); Hook, Hall, Davis, Van Tongeren & Conner (2021), Journal of Clinical Psychology 77(4), 865-883, https://doi.org/10.1002/jclp.23097 (from the abstract); Newgent, Parr, Newman & Wiggins (2004), Measurement and Evaluation in Counseling and Development 36(4), 226-237, https://doi.org/10.1080/07481756.2004.11909744 (from the abstract); Sutton (2007), Implicit and explicit personality in work settings: an application of Enneagram theory, doctoral thesis, University of Leeds, https://etheses.whiterose.ac.uk/id/eprint/2869/; Yanartaş, Malakcıoğlu, Acarkan & Akça (2022), Anadolu Kliniği Tıp Bilimleri Dergisi 27(3), 248-259, https://doi.org/10.21673/anadoluklin.1104082; McCrae & Costa (1989), Journal of Personality 57(1); Furnham, Moutafi & Crump (2003), Social Behavior and Personality 31(6); Hwang (2005), A comparison of the Enneagram and the MBTI [in Korean], Korean Journal of Youth Studies 12(2), 301-322.