The 64 personality types: every 64-type system compared, with the data (2026)

Where the 64 types come from

Six-letter codes spread on Japanese social media as the “new MBTI” (新MBTI) in late 2025: a Japanese beauty-app blog described the 64-type trend and linked a 100-question test in December 2025,^[1] and its English blog followed in February 2026, describing the 64 types as each of the 16 types split into four subtypes.^[2] The idea builds on 16Personalities, whose fifth letter (-A or -T) already turns 16 types into 32.^[3]

None of these sites is connected to The Myers-Briggs Company or to 16Personalities, and 16Personalities itself asks that its codes not be treated as interchangeable with the MBTI.^[4] 64 Types is not affiliated with any of the companies named in this guide.

The 64-type systems, side by side

Two practical consequences follow. First, a code such as INFJ-AS on one site and INFJ-CM on another are not the same kind of label, so compatibility charts and type descriptions do not carry over between sites. Second, the A/T letter in the most common scheme is the same idea 16Personalities already measures as Identity,^[10] so the genuinely new information in that scheme is the C/S letter.

How to translate one 64-type code into another

The first four letters mean roughly the same thing on every site, because all of them start from the MBTI dichotomies. Research that compared the MBTI with a Big Five inventory found each letter pair lines up with one Big Five trait: E/I with Extraversion, S/N with Openness, T/F with Agreeableness and J/P with Conscientiousness.^[8] So if two sites give you the same four letters, they broadly agree about you.

The last two letters need care:

• Assertive/Turbulent ↔ Composed/Responsive. 16Personalities describes Turbulent people as more stress-sensitive and self-critical,^[3] which overlaps with the research trait of neuroticism, measured in 64 Types as Emotional Stability. Assertive is closest to Composed (C) and Turbulent to Responsive (R), but the scales are not identical. More in Assertive vs Turbulent explained.
• Cooperative/Self-directed and Warm/Cool describe how you relate to others. They overlap with what the T/F letter already measures as Agreeableness,^[8] so they partly repeat information you already have.
• Modest/Ambitious (64 Types’ sixth letter) has no counterpart in the other systems: it measures sincerity, fairness, modesty and lack of greed, a sixth broad trait found in personality words across many languages.^[9] More in Honesty-Humility explained.

Why emotional stability and honesty-humility

When McCrae and Costa compared the MBTI with a full Big Five inventory, its four scales covered four of the five traits; none captured neuroticism.^[8] That gap matters, because neuroticism is one of the most consequential traits studied: groups with anxiety, depressive and substance-use disorders score far higher on it.^[11]

Honesty-Humility is the sixth factor of the HEXACO model, measured by the HEXACO Personality Inventory.^[12] In a meta-analysis of workplace behaviour it was the strongest personality correlate of counterproductive work behaviour, ahead of conscientiousness and agreeableness.^[13] Adding these two letters therefore adds information the 16 types cannot provide, rather than relabelling what the four letters already measure.

These are average associations across many people, not predictions about any one person. A personality test is a tool for self-understanding, not a clinical or hiring instrument.

How common is each type? Population vs online results

The best population data for the 16 types is still the US national representative sample in the 1998 MBTI Manual (3,009 adults).^[14] Online results look very different. 16Personalities publishes country profiles from its own test-takers; its US profile covers 11.1 million results from October 2025 to September 2026,^[15] and its Japan profile 26.5 million.^[16]

Intuitive (N) types make up about 27% of the population sample but about 69% of 16Personalities’ US results. In Taiwan’s 2.0 million results INFP leads at 13.5% and ESTP is rarest at 0.9%.^[17] The likeliest reason for the gap is self-selection: people who seek out a long online personality test are not a random sample of the population. Online shares therefore describe who takes the test, not how common a type is. For the rarest type in the population and our own analysis of open data, see What is the rarest personality type?

For the two extra letters there is no population data yet for any 64-type scheme; 64 Types reports them as percentiles against open research samples instead of fixed shares.^[18]

How popular personality types have become

• 16Personalities says its test has been taken more than 1.5 billion times, in over 45 languages.^[4]
• South Korea: a Hankook Research survey found more than half of Koreans, and about nine in ten people aged 19 to 28, had taken an MBTI-style test.^[19]
• Japan: the 64-type wave started there,^[1] and 16Personalities’ Japan profile counts 26.5 million results in a year,^[16] more than twice its US profile’s 11.1 million.^[15]

Popularity is not the same as accuracy. When people retake a type test a few weeks later, a large share get a different four-letter type, mainly because most scores sit near the middle of each scale.^[20][21] More in Are personality tests accurate?

Which 64-type test should you take?

Pick by what you want from the two extra letters:

• You want the code everyone on social media is sharing: the A/T-C/S scheme is the most common.
• You want the extra letters to be traits psychologists measure, with your scores as percentiles and borderline letters flagged: 64 Types (free, 62 questions, about 8 minutes, no sign-up, 40 languages).
• You came from 16Personalities: see the free 16Personalities alternative for how the two compare.

Frequently asked questions