Short answer: they answer different questions. A Holland code describes what kind of work activities you are interested in. An MBTI-style type describes how you prefer to take in information, make decisions, and organise your day. For predicting job performance and staying power, the research evidence behind interest fit is stronger than the evidence behind type. For choosing an environment you can sustain, type adds a lens interests leave out. The most useful career search uses both, for different jobs.
This post lays out what each framework measures, how much they actually overlap, and what the published meta-analyses say about outcomes. The aim is to help you combine them without treating either as a verdict.
What a Holland code measures
John Holland’s theory proposes that both people and work environments can be described with six interest types, usually abbreviated RIASEC (Holland, 1997):
| Code | Interest type | Typical work activities |
|---|---|---|
| R | Realistic | Working with tools, machines, plants, animals, or physical materials |
| I | Investigative | Researching, analysing, solving abstract or scientific problems |
| A | Artistic | Creating, designing, writing, performing; unstructured self-expression |
| S | Social | Teaching, helping, counselling, caring for people |
| E | Enterprising | Persuading, leading, selling, starting and running ventures |
| C | Conventional | Organising data, records, and processes with clear standards |
Your code is usually your top two or three letters, such as “IAS” or “ECS”. Holland’s central prediction is congruence: people tend to be more satisfied and more persistent when their interest profile matches the profile of their work environment (Holland, 1997).
The best-known free RIASEC tool is the ONET Interest Profiler, developed for the U.S. Department of Labor’s ONET program. It measures the same six interest types, and its results link directly to more than 900 occupations in ONET’s career databases. The short web version (the Mini-IP) has 30 questions (National Center for ONET Development, 2024).
What an MBTI-style type measures
The MBTI Manual describes the Indicator as a way of sorting preferences on four dichotomies: where you direct energy (E/I), how you take in information (S/N), how you decide (T/F), and how you approach structure (J/P). It is not presented as a measure of ability or of which occupation you should hold (Myers, McCaulley, Quenk & Hammer, 1998).
PersonalityCareers’ free test scores a Big Five questionnaire and maps the scores to four letters. That mapping rests on McCrae and Costa’s (1989) finding that MBTI scales line up with Big Five traits: E/I with Extraversion, S/N with Openness, T/F with Agreeableness, and J/P with Conscientiousness. The details are on our Test Methodology page. This matters here because most of the research linking personality to Holland codes uses Big Five measures.
How much do Holland codes and personality overlap?
Less than many career quizzes imply.
Larson, Rottinghaus, and Borgen (2002) meta-analysed 24 samples that gave people both a major RIASEC inventory and the NEO Personality Inventory, the standard Big Five measure. Of 30 possible interest–trait correlations, only five were substantial across genders and inventories:
| Interest type | Big Five trait | Mean correlation | Nearest MBTI letter |
|---|---|---|---|
| Artistic | Openness | r = .48 | N |
| Enterprising | Extraversion | r = .41 | E |
| Social | Extraversion | r = .31 | E |
| Investigative | Openness | r = .28 | N |
| Social | Agreeableness | r = .19 | F |
The “nearest MBTI letter” column applies the McCrae and Costa (1989) mapping. It is an inference from two separate bodies of research, not a result Larson and colleagues reported for the MBTI itself.
A second meta-analysis reached the same broad conclusion. Mount, Barrick, Scullen, and Rounds (2005) found that only four of the 30 corrected personality–interest correlations exceeded .20, that 22 were .10 or less, and that “in general the correlations between interests and personality are low.”
The Myers-Briggs Company, which publishes both the MBTI and the Strong Interest Inventory, reports a similar pattern of links between the two instruments. Realistic interests go with Thinking and Perceiving, Artistic with Intuition and Feeling, Social with Feeling, Enterprising with Extraversion, and Conventional with Sensing and Judging (The Myers-Briggs Company, 2019). Note that Investigative is not on that list.
What this means for you: you cannot reliably convert four letters into a Holland code, or the reverse. An INFP can score highest on Investigative, and an ISTJ on Artistic. Even a correlation of .48 leaves most of the variation in one measure unexplained by the other. Treat them as two separate measurements.
Which one predicts job outcomes?
Here the evidence clearly favours interests.
- Performance and turnover. Van Iddekinge, Roth, Putka, and Lanivich (2011) pooled 74 studies and 141 independent samples. Single interest scales correlated .14 with job performance, .26 with training performance, −.19 with turnover intentions, and −.15 with actual turnover. Validity was higher (.23 for job performance) for scales built around interests relevant to the specific job, and highest when several interests were combined.
- Fit beats raw scores. Nye, Su, Rounds, and Drasgow (2012) summarised 60 studies and about 568 correlations. Interest scores alone correlated .20 with performance. Congruence, meaning how well a person’s interest profile matched their occupation, correlated .36. That is the strongest support for Holland’s fit idea in the performance literature.
- Satisfaction. Earlier meta-analyses put the average congruence–satisfaction correlation at about .20 (Tranberg, Slane & Ekeberg, 1993). A later replication of 26 studies, 53 samples, and 6,557 respondents found that the size of the link depends heavily on how congruence and interests are measured (Tsabari, Tziner & Meir, 2005).
By contrast, reviews of the MBTI find little evidence that type predicts job performance (Furnham, 2018). That is consistent with the Manual’s own position that type describes preference, not capability (Myers et al., 1998).
None of these effects are large enough to decide a career on their own. A correlation of .36 is strong by the standards of this field and still leaves plenty of room for individual exceptions.
So why use MBTI-style type at all?
Because interests tell you what you might enjoy doing, but not how you will want to do it. Two people with the same top interest, Investigative, can want very different working days:
- One prefers long stretches of solo analysis, written communication, and a decision made once the evidence is in (closer to I, T, and J).
- Another wants to test ideas out loud with a team, follow tangents, and keep options open (closer to E, F, and P).
Both might fit research work. They are unlikely to thrive in the same research environment. Type is a vocabulary for that second layer: pace, collaboration, structure, and what drains you under pressure. It is a hypothesis to check against real job descriptions, not a filter that rules fields in or out.
A two-lens career search
- Get your interest code. Take the free O*NET Interest Profiler and note your top two or three RIASEC letters. This narrows which kinds of work to explore.
- Get your preference profile. Take our free personality test (about 5 minutes) for a working four-letter type. If a letter came out close to 50/50, read both versions.
- Shortlist occupations by interest first. The interest evidence is stronger for performance and persistence, so let the RIASEC match decide which occupations make your first shortlist.
- Filter environments by type second. Open your type under Browse Types and read its Career page: work environment, leadership style, and stress triggers. For each shortlisted occupation, ask whether the day-to-day rhythm fits.
- Check live roles. Use your type’s Jobs page to see real listings, then judge each one on skills, pay, location, and manager. Neither framework can see those.
Frequently asked questions
Is a Holland code test better than an MBTI test for choosing a career?
For predicting how well you will perform and how long you will stay, the published evidence is stronger for interest fit (Nye et al., 2012; Van Iddekinge et al., 2011). For describing how you like to work, an MBTI-style type adds something interests do not cover. They are complements, not competitors.
Can I convert my MBTI type into a Holland code?
No. The overlap between personality traits and interests is modest. Only a handful of trait–interest pairs correlate meaningfully, and most correlations are near zero (Larson et al., 2002; Mount et al., 2005). Measure each one directly.
Where can I take a free Holland code test?
The ONET Interest Profiler is free and links your results to ONET occupation profiles: O*NET Interest Profiler.
Which personality traits relate most to career interests?
In meta-analytic data, Openness relates most to Artistic and Investigative interests, and Extraversion to Enterprising and Social interests. Agreeableness has a smaller link to Social interests (Larson et al., 2002).
Start here
- Take the Free Test for your working four-letter type
- Browse Types to read the Career and Jobs pages for your type
- Read How to Job-Search by MBTI Type Without Boxing Yourself In for a step-by-step search process
- Read What Our Personality Test Measures for the limits of any four-letter result
Let interests narrow the work. Let type narrow the environment. Then let real listings and your skills make the final call.