TL;DR
There is no single answer to "how many personality types are there" — the number is baked into whichever system you're using. The MBTI has 16, the Enneagram has 9, DISC has 4, and the classical temperaments have 4. But the model most respected by scientists — the Big Five — has zero fixed types, because it doesn't sort people into boxes at all. It measures five continuous dimensions and describes you with a profile of scores. This guide lays out every major system, how many "types" each claims, where each came from, and which ones the evidence actually backs.
Search "how many personality types are there" and you'll get numbers all over the map: 16, 9, 4, 12, even 32. They can't all be right — so which is it?
The honest answer is that the question has no fixed answer, because "type" isn't a fact about people; it's a design choice made by each system. One framework decides to draw four boxes, another sixteen, another none at all. Asking how many personality types exist is a little like asking how many regions a country has — it depends entirely on who's drawing the map.
So instead of one number, this guide gives you the whole landscape: the major systems, how many types each defines, who invented them, and — the part that actually matters — which ones hold up to scientific scrutiny and which are better treated as entertainment.
The short answer, by system
Here's every major framework at a glance, from most "types" to none:
| System | How many "types" | Basis | Scientific standing |
|---|---|---|---|
| Astrology (zodiac) | 12 signs | Ancient/celestial | None (pseudoscience) |
| MBTI (Myers-Briggs) | 16 types | 4 either/or dichotomies | Popular, but weak reliability/validity |
| DISC | 4 styles (→ ~12 blends) | 4 behavioral quadrants | Workplace tool, limited independent validation |
| Enneagram | 9 types (→ 27 subtypes) | 9-point symbol | Popular, mixed/limited evidence |
| Four temperaments | 4 | Ancient "humors" | Historical, pre-scientific |
| Big Five (OCEAN) | 0 types — 5 dimensions | Continuous traits | Strongest scientific support |
| HEXACO | 0 types — 6 dimensions | Continuous traits | Strong; research-favored |
Notice the pattern: the systems that give you a satisfyingly specific number of types (16! 9!) tend to be the ones on shakier scientific ground, while the frameworks scientists trust most refuse to give you a type count at all. That's not a coincidence — and it's the key to the whole topic.
The type systems (the ones that sort you into boxes)
MBTI — 16 types
The Myers-Briggs Type Indicator is the most famous type system in the world. It sorts people into 16 types built from four either/or dichotomies: Extraversion/Introversion (E/I), Sensing/iNtuition (S/N), Thinking/Feeling (T/F), and Judging/Perceiving (J/P). Four either/or choices means 2 × 2 × 2 × 2 = 16 combinations, each written as a four-letter code like INFP or ESTJ.
It was developed by the mother-daughter pair Katharine Cook Briggs and Isabel Briggs Myers, starting around World War II, building on Carl Jung's 1921 book Psychological Types. (Jung himself described 8 types by crossing introversion/extraversion with four mental functions; the J/P axis was Myers and Briggs's own addition.)
Why researchers are wary of the 16 types
Despite its popularity, the MBTI is not favored in academic psychology. Two problems stand out. First, poor test-retest reliability: depending on the study, roughly 39–76% of people get a different four-letter type when they retake it just weeks later (Pittenger, 2005). Second, the either/or dichotomies don't match reality — scores on each scale form a single bell curve, so the cutoffs slice a continuous trait down the middle rather than separating two natural kinds of people (McCrae & Costa, 1989). It's a fun, memorable framework, but "your type" is far less stable than it feels.
Enneagram — 9 types
The Enneagram maps personality onto a nine-pointed figure, giving 9 core types (the Reformer, the Helper, the Achiever, and so on). Each type is refined by "wings" (the two neighboring types) and by three instinctual subtypes, which multiply the nine into 27 finer patterns.
The modern personality system is generally traced to Oscar Ichazo (from the 1950s onward), with Chilean psychiatrist Claudio Naranjo developing and psychologizing it in the United States from around 1970. Its origins are genuinely disputed — proponents claim ancient roots, but the type system as we know it is a 20th-century synthesis. It's beloved in coaching and spiritual circles, but its scientific track record is thin: a systematic review of 104 samples found only "mixed evidence of reliability and validity," and no study has empirically derived the nine types from data (Hook et al., 2021).
DISC — 4 styles
DISC is the workplace favorite. It sorts behavior into 4 core styles: Dominance, Influence, Steadiness, and Conscientiousness (sometimes "Compliance"). Modern tools blend these four quadrants into finer patterns — the widely used Everything DiSC circumplex, for instance, maps 12 styles.
It descends from psychologist William Moulton Marston's 1928 book Emotions of Normal People. A historical wrinkle: Marston never built an assessment, and his original four terms were Dominance, Inducement, Submission, and Compliance — the familiar D-I-S-C labels are a later commercial relabeling. The first DISC self-assessment came in 1956. As a research instrument it has limited independent validation; it's best understood as a practical team-communication tool, not a scientific taxonomy.
The dimensional systems (the ones that refuse to box you)
Here's where the "how many types" question breaks down entirely — because the most scientifically respected frameworks don't have types at all.
Big Five — 5 dimensions, 0 types
The Big Five, or Five-Factor Model, measures five continuous dimensions: Openness, Conscientiousness, Extraversion, Agreeableness, and Neuroticism (the acronym OCEAN). Each is a spectrum from low to high, and you're described not by a category but by a profile — where you land on all five.
So how many Big Five types are there? None. The model is dimensional, not typological. It grew out of decades of lexical and factor-analytic research and was operationalized into the NEO inventories by Paul Costa and Robert McCrae. It's the dominant model in academic personality psychology, and its five-factor structure has been recovered across a wide range of languages and cultures — one large study found it clearly replicated across most of 50 cultures (McCrae et al., 2005).
HEXACO — 6 dimensions, 0 types
HEXACO is a close cousin that adds a sixth dimension: Honesty-Humility, Emotionality, eXtraversion, Agreeableness, Conscientiousness, and Openness. Developed by Michael Ashton and Kibeom Lee from cross-language lexical studies, it's also fully dimensional, and its extra Honesty-Humility factor makes it useful for studying traits like manipulativeness that the Big Five splits across its dimensions.
The systems that give you a crisp type count are drawing arbitrary lines on continuous traits. The systems that refuse to — Big Five, HEXACO — are the ones the evidence supports. The number of types isn't discovered; it's decided.
Types vs. traits: the distinction that actually matters
Strip away the branding and every personality system falls into one of two camps, and this is the real answer to "how many types are there":
- Type systems (MBTI, Enneagram, DISC, temperaments) sort people into a fixed set of categories — 16, 9, 4. You're either an INFP or you're not.
- Trait/dimensional systems (Big Five, HEXACO) place you on continuous scales. You're not "in" or "out" of anything; you're somewhere along each spectrum.
Which is closer to the truth? The evidence leans hard toward dimensions. When statisticians use taxometric methods — techniques built specifically to test whether an underlying variable is truly categorical or continuous — personality generally comes out dimensional, not made of discrete kinds. A large review of hundreds of such analyses concluded that personality differences are overwhelmingly matters of degree, not category (Haslam, Holland & Kuppens, 2012).
That's why type systems feel a bit off: they take a smooth gradient and chop it into bins, so two nearly identical people can land in opposite "types" while two quite different people share one. Dimensions avoid that by keeping the full detail of where you actually fall.
Type systems aren't worthless — just don't overtrust them
None of this means MBTI, Enneagram, or DISC are useless. They can be genuinely helpful as shared vocabulary, conversation starters, or team-building icebreakers, and many people find their type descriptions insightful. The caution is narrower: don't treat a type label as a precise, stable, scientific fact about who you are. It's a rough sketch, not a measurement.
So what's the real answer?
If you want a single sentence: there are as many personality "types" as each system chooses to define — and the science suggests there are really no fixed types at all, just continuous dimensions everyone falls along.
That reframe is freeing. You don't have to find the one true box you belong in, because there isn't one. What you can do is measure where you land on the handful of traits that decades of research keep confirming — and get a description of yourself that's specific to you, not shared with millions of other "INFPs." For a fuller comparison of the two most-searched systems, see our Big Five vs. MBTI breakdown.
Skip the box — get your real profile
Instead of one of 16 types, get your exact position on all five Big Five dimensions in about 7 minutes. Free, no signup — the science-backed way to understand your personality.
Frequently asked questions
The bottom line
"How many personality types are there?" turns out to be the wrong question — or rather, a question with as many answers as there are systems willing to invent one. Sixteen if you ask Myers-Briggs, nine if you ask the Enneagram, four if you ask DISC, and none at all if you ask the model scientists actually rely on.
The deeper truth is that people don't come in a tidy number of kinds. We vary by degree across a small set of continuous traits — and the most useful thing you can do isn't to find your box, but to see where you actually fall. That's what the Big Five measures, and it's a far richer answer than any single label.
Find where you actually fall
No boxes, no 16 types — just your real scores across the five dimensions psychologists trust most. The free Big Five test takes about 7 minutes, no signup required.
Keep reading: what the Big Five is, Big Five vs. MBTI compared, or how to read your Big Five results.
Sources
McCrae, R. R., & Costa, P. T. (1989). Reinterpreting the Myers-Briggs Type Indicator from the perspective of the five-factor model of personality. Journal of Personality, 57(1), 17–40. — Found the MBTI's dichotomous "types" aren't supported; the traits are continuous dimensions.
Pittenger, D. J. (2005). Cautionary comments regarding the Myers-Briggs Type Indicator. Consulting Psychology Journal: Practice and Research, 57(3), 210–221. — Reviews the MBTI's weak reliability and validity as a typology.
Hook, J. N., Hall, T. W., Davis, D. E., Van Tongeren, D. R., & Conner, M. (2021). The Enneagram: A systematic review of the literature and directions for future research. Journal of Clinical Psychology, 77(4), 865–883. — Found mixed and limited evidence for the Enneagram's reliability and validity.
McCrae, R. R., Terracciano, A., & 79 Members of the Personality Profiles of Cultures Project. (2005). Universal features of personality traits from the observer's perspective: Data from 50 cultures. Journal of Personality and Social Psychology, 88(3), 547–561. — Showed the Big Five structure replicates across most of 50 cultures.
Haslam, N., Holland, E., & Kuppens, P. (2012). Categories versus dimensions in personality and psychopathology: A quantitative review of taxometric research. Psychological Medicine, 42(5), 903–920. — Reviewed hundreds of analyses and found personality is better modeled as dimensions than discrete types.
Ashton, M. C., & Lee, K. (2007). Empirical, theoretical, and practical advantages of the HEXACO model of personality structure. Personality and Social Psychology Review, 11(2), 150–166. — Introduces the six-dimension HEXACO framework.
