Big Five vs 16 Types: Which Personality Test Should You Take?

Both the Big Five and the 16 personality types are everywhere. Career coaches recommend them. Therapists reference them. Your friend who "just discovered they're an INFJ" won't stop talking about one of them. But these two frameworks are not interchangeable, and picking the wrong one for your question can leave you with an answer that sounds good but doesn't actually help.

Here is a direct comparison, grounded in what the research says, so you can pick the test that gives you something useful.

1. What Each Test Actually Measures

The Big Five (also called the Five-Factor Model or OCEAN) measures five broad dimensions of personality: Openness to Experience, Conscientiousness, Extraversion, Agreeableness, and Neuroticism. Each dimension is a spectrum. You don't get sorted into a box. You get a position on five separate sliding scales, and those positions combine into a profile that is statistically unique (Costa & McCrae, 1992).

The 16 personality types, based on Carl Jung's theory of cognitive functions, sort you into one of 16 categories using four binary preferences: Introversion/Extraversion, Sensing/Intuition, Thinking/Feeling, and Judging/Perceiving. The most well-known version is the Myers-Briggs Type Indicator (MBTI), though many free tests online use the same framework.

The key difference: the Big Five treats personality as continuous (you score somewhere on each scale), while the 16 types treat personality as categorical (you are one type or another).

2. Scientific Backing

This is where the gap gets significant.

The Big Five is the dominant model in academic personality psychology. It has been validated across cultures, languages, age groups, and decades of longitudinal research (John, Naumann, & Soto, 2008). It predicts real outcomes: job performance, relationship satisfaction, health behaviors, academic success, and even mortality risk (Roberts et al., 2007).

The 16 types framework has weaker empirical support. A major concern is test-retest reliability: studies have found that roughly 50% of people get a different type when retaking the MBTI just five weeks later (Pittenger, 1993). The binary classification forces people into one side of each preference, even when they score near the middle. Someone who is 51% Thinking and 49% Feeling gets the same "T" label as someone who is 95% Thinking.

This doesn't mean the 16 types are useless. It means they're better understood as a conversation starter than a precise measurement instrument.

3. What Each Test Is Good For

The Big Five is better for:

• Getting an accurate, granular picture of where you stand on well-researched traits
• Understanding how you compare to population norms (percentile scoring)
• Predicting real-world outcomes like job satisfaction, stress patterns, and relationship dynamics
• Tracking personality change over time (because it measures degree, not category)
• Research-backed self-awareness that goes deeper than a label

The 16 types are better for:

• Quick, memorable shorthand for communication style ("I'm an introvert who leads with feeling")
• Team-building exercises where simplicity matters more than precision
• Starting conversations about personality with people who aren't interested in nuance
• Getting a rough directional sense of your preferences

4. Depth of Results

A Big Five result with 30 facets (six per dimension) gives you a genuinely complex portrait. You might score high on overall Conscientiousness but discover that your self-discipline is strong while your orderliness is low. That distinction matters. It explains why you can finish a marathon training plan but your desk looks like a crime scene.

The IPIP-NEO-120, the gold-standard open-source Big Five assessment, measures all 30 facets. That is 30 separate data points about your personality, each with its own percentile score (Goldberg et al., 2006).

A 16 types result gives you four letters. Some implementations add percentage scores for each preference, but the framework itself doesn't have the granularity to distinguish between the many ways someone can be, say, an "ENFP."

5. How They Handle the Middle

Most people are not extreme on any personality dimension. The average person sits somewhere near the middle of each scale. This is where the two frameworks diverge most sharply.

The Big Five handles middle scores naturally. If you score at the 50th percentile on Extraversion, your result says exactly that: you're roughly average, neither strongly introverted nor strongly extraverted. This is useful and accurate information.

The 16 types must assign you to one side or the other. If you score 51% Extraversion, you're labeled E. If you score 49%, you're labeled I. Two people with nearly identical personalities get different types. This is the source of the reliability problem mentioned above, and it is also why many people feel their type "doesn't quite fit."

6. Cultural Validity

The Big Five structure has been replicated in over 50 cultures and dozens of languages (McCrae & Costa, 1997). The five factors emerge consistently whether you study college students in the United States, factory workers in Germany, or indigenous communities in Bolivia. This cross-cultural replication is one of the strongest arguments for the model's validity.

The 16 types framework was developed primarily within Western, English-speaking populations. While translations exist, the four-preference structure has not been replicated with the same cross-cultural consistency.

7. What Employers Actually Use

If you have taken a personality test for a job application, it was almost certainly based on the Big Five or a closely related model. The reason is legal and practical: the Big Five has enough predictive validity to justify its use in hiring contexts, while the MBTI publisher (The Myers-Briggs Company) explicitly states the MBTI should not be used for hiring decisions.

Conscientiousness is the single best personality predictor of job performance across nearly all occupations (Barrick & Mount, 1991). That kind of specific, actionable finding comes from the Big Five's continuous measurement approach.

8. Which One Should You Take First?

If you want genuine self-awareness, start with the Big Five. Specifically, take a version that measures all 30 facets, not just the five broad dimensions. The facet-level detail is where the real insights live.

A good Big Five assessment will tell you things that make you stop and think: "Wait, that's actually true." It will surface patterns you've noticed about yourself but never had language for. And because it's based on decades of validated research, you can trust that what it tells you reflects something real about how you move through the world.

The 16 types can be a fun supplement. But if you're looking for the test that will actually teach you something about yourself, the Big Five is the one with the evidence behind it.

Ready to see your Big Five profile? Take the IPIP-NEO-120 personality assessment - it measures all 30 facets across the five dimensions, giving you the most detailed picture of your personality available. It takes about 15 minutes, and the results are free.

References

• Barrick, M. R., & Mount, M. K. (1991). The Big Five personality dimensions and job performance. Personnel Psychology, 44(1), 1-26.
• Costa, P. T., & McCrae, R. R. (1992). Revised NEO Personality Inventory (NEO PI-R) and NEO Five-Factor Inventory (NEO-FFI) professional manual. Psychological Assessment Resources.
• Goldberg, L. R., et al. (2006). The International Personality Item Pool and the future of public-domain personality measures. Journal of Research in Personality, 40(1), 84-96.
• John, O. P., Naumann, L. P., & Soto, C. J. (2008). Paradigm shift to the integrative Big Five trait taxonomy. In O. P. John, R. W. Robins, & L. A. Pervin (Eds.), Handbook of personality: Theory and research (3rd ed., pp. 114-158). Guilford Press.
• McCrae, R. R., & Costa, P. T. (1997). Personality trait structure as a human universal. American Psychologist, 52(5), 509-516.
• Pittenger, D. J. (1993). Measuring the MBTI... and coming up short. Journal of Career Planning and Employment, 54(1), 48-52.
• Roberts, B. W., et al. (2007). The power of personality: The comparative validity of personality traits, socioeconomic status, and cognitive ability for predicting important life outcomes. Perspectives on Psychological Science, 2(4), 313-345.