HEXACO vs Big Five: Why the Scales Are Not Interchangeable
Compare the constructs in HEXACO and Big Five, including differences in Emotionality and Agreeableness, and learn how to assess instrument claims.
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Two questionnaires can use similar trait names and still ask different questions. That is the main reason not to compare a HEXACO score directly with a Big Five score.
Both are models for organizing personality traits. The HEXACO model has six broad dimensions; Big Five has five. Neither number tells you what fraction of a person's personality has been captured, and neither model name establishes that a particular online questionnaire is validated.
Start with the meaning of each dimension
The HEXACO authors' descriptions and Soto and John's BFI-2 overview provide named reference points. The BFI-2 is one Big Five instrument, not a synonym for every Big Five questionnaire.
| Area | Big Five framing | HEXACO framing |
|---|---|---|
| Curiosity and imagination | Openness; BFI-2 uses Open-Mindedness | Openness to Experience |
| Organization and follow-through | Conscientiousness | Conscientiousness |
| Social engagement | Extraversion | Extraversion |
| Interpersonal tendencies | Agreeableness | Content distributed across Agreeableness and other domains |
| Emotional experience | Neuroticism; BFI-2 uses Negative Emotionality | Emotionality has a different content mix |
| Fairness and self-importance | No separately named Honesty-Humility domain | Honesty-Humility |
This table compares concepts, not equivalent scores. Even the similarly named domains can differ in wording, facets, and scoring.
Honesty-Humility is not a hiring filter
HEXACO gives fairness, modesty, and attitudes toward personal advantage a distinct domain. That lets a researcher ask questions about those constructs separately. It does not make a self-report questionnaire a lie detector.
In particular, this site's output cannot establish whether a person will mishandle money, abuse power, or be a trustworthy partner. A low local score is not proof of dishonesty; a high score is not an integrity guarantee. We do not recommend choosing HEXACO to screen applicants for "ethics-sensitive" roles.
Emotionality is not reversed Neuroticism
HEXACO Emotionality includes sentimental attachment and seeking emotional support, alongside fear and worry. Its Agreeableness domain covers tendencies related to anger and forgiveness. Simply reversing a Neuroticism score cannot reproduce that arrangement.
Here is an illustrative example, not a participant case: someone might describe strong attachments to friends and little day-to-day worry. A single label such as "emotionally reactive" could obscure that distinction. Read the individual construct descriptions before deciding what a report means.
Neither domain diagnoses anxiety, depression, or a personality disorder. A score should not determine whether someone deserves support or can handle a demanding job.
Which model is better?
"Better" needs a purpose. A research project may need a specific domain or comparability with an earlier study. An individual may simply find one vocabulary easier to use. Neither reason establishes universal superiority.
The Testing Standards from AERA, APA, and NCME distinguish evidence for a particular interpretation and use from a general claim that a test is valid. Cross-language or cross-cultural use also needs relevant evidence; a translation or a familiar model name is not sufficient.
When comparing providers, ask for the exact instrument, version, population, language, and evidence behind the claim. Check permission conditions separately. The HEXACO materials page and BFI-2 author page describe their own conditions; their availability does not authorize any adaptation.
What the local exercises can and cannot offer
Our Big Five questionnaires and standard HEXACO Model Reflection are locally implemented, unvalidated reflection exercises, not the BFI-2 or HEXACO-PI-R. Their item sources, authorship, adaptation history, and permissions have not been fully verified. The local HEXACO short form is withdrawn. A longer local questionnaire does not inherit the published instrument's evidence.
Local scores use a 0-100 response scale without population norming. They are not percentiles, probabilities, or percentages of personality. A score from one model cannot be converted into a score from the other just because both displays have the same endpoints.
If you use the Big Five reflection exercise, choose one result to compare with your own examples. Ask what fits, what does not, and what information a questionnaire missed. Do not average profiles into a supposed "true" score.
For HEXACO-focused reflection, read the local model and score guide before trying the optional unvalidated HEXACO reflection. Use its own descriptions rather than translating your Big Five scores.
For the published HEXACO inventory, consult the authors' materials rather than a local substitute. Keep any personal reflection voluntary and separate from hiring, promotion, diagnosis, educational placement, or moral judgment.
Sources and further reading
- Ashton and Lee, HEXACO scale descriptions: domain and facet definitions.
- Soto and John, BFI-2 author overview: one identified Big Five instrument.
- Ashton and Lee, HEXACO inventory materials: official forms and use conditions.
- AERA, APA, and NCME (2014), Testing Standards: evidence requirements, not local validation.