Last year you were an INFJ. You told friends, read the descriptions and felt deeply seen. Then you retook the test on a whim and came out as an INFP. A month later, ENFP. Now you are not sure who you are supposed to be.
You are not having an identity crisis, and you are not doing the test wrong. Getting a different Myers-Briggs type on retest is very common, and it has more to do with how the test is built than with you. Here is why it happens, and how to get a more stable picture of your personality.
You are not alone
The Myers-Briggs Type Indicator, or MBTI, sorts people into one of 16 types using four pairs of letters: E or I, S or N, T or F, J or P. It is hugely popular in workplaces, coaching and online.
But it has long been criticised for test-retest reliability, which is how consistently a test gives the same result when you take it again. In a widely cited 1993 review, the psychologist David Pittenger noted that a large share of people, by some estimates up to around half, received a different type when retested after only a few weeks.
That does not mean every letter is random. Most people keep at least some of their letters. But because a type is made of four separate splits, a change on any one of them gives you a "new" type.
The real reason: smooth traits, hard boxes
The main reason types shift is structural. Most personality traits are spread across people a bit like height. Many people sit near the middle, and fewer are at the extremes.
The MBTI takes each of those smooth scales and cuts it in half. You are either an E or an I, a T or an F, with nothing in between.
Imagine introversion and extraversion on a line from 0 to 100, with the cut-off at 50:
- Someone scoring 49 is labelled an introvert.
- Someone scoring 51 is labelled an extravert.
- Someone scoring 10 is also labelled an introvert, just like the person at 49.
If you sit near the middle, a tiny shift in how you answer on a given day can flip your letter. And since most people are close to the middle on at least one dimension, a change of type on retest is almost to be expected.
If you often land on the line between introvert and extravert, you might recognise yourself in 10 signs you're an ambivert.
Other reasons your type changes
The box problem is the biggest factor, but several others play a part.
Mood and circumstances
How you feel when you take the test matters. After a draining week you might answer like an introvert. Fresh from a great holiday, you might lean extravert. Your underlying personality has not changed, but your answers have.
Which self you picture
Many people answer differently depending on whether they are thinking of themselves at work, at home or with close friends. A question such as "Do you prefer to plan ahead?" can have different honest answers in different parts of your life.
Forced-choice questions
The MBTI and many online versions often ask you to choose between two options. If neither fits well, or both do, your choice can come down to a coin toss. Those near-random choices add up.
Different versions of the test
Many free online tests use the same four-letter labels but are built differently from the official MBTI, and some blend in extra scales. Taking two different quizzes is a bit like weighing yourself on two different scales.
Real, gradual change
Personality does shift slowly over years, so if you took a test at 18 and again at 35, some of your change may be genuine. But that does not explain flipping types month to month.
| Reason | How much it shifts your result | What it tells you |
|---|---|---|
| Scoring near a cut-off | Large | You are in the middle on that dimension |
| Mood on the day | Moderate | Your answers depend on how you feel |
| Context you imagine | Moderate | You behave differently in different settings |
| Forced-choice items | Moderate | Neither option described you well |
| Different test versions | Moderate to large | Tests are measuring slightly different things |
| Genuine change over years | Small, gradual | You have grown or adapted |
What the MBTI misses
There is another gap worth knowing about. The four MBTI dimensions roughly overlap with four of the Big Five traits, a link shown in research by Robert McCrae and Paul Costa:
- Extraversion-Introversion lines up with extraversion.
- Sensing-Intuition lines up with openness to experience.
- Thinking-Feeling lines up with agreeableness.
- Judging-Perceiving lines up with conscientiousness.
But the MBTI does not measure the fifth Big Five trait, neuroticism, or emotional stability. That is a significant omission, because how you handle stress and negative emotion is one of the most important parts of personality. We compare the two systems in detail in Big Five vs MBTI.
Is the MBTI useless, then?
Not entirely. Many people find it a helpful way to start thinking about their preferences and how they differ from others. The language of types can make conversations about personality easier, especially in teams.
The problem comes when you treat your four letters as a fixed identity, or use them for big decisions like hiring or choosing a career. A type that can change from one month to the next is not a firm foundation for that.
A more stable way to understand yourself
If you want results that hold up when you retake them, a trait-based test is a better option. Instead of putting you in a box, it shows where you fall on each scale, so being in the middle is simply shown as being in the middle.
A few tips for getting consistent results from any personality test:
- Picture your typical self, not your best or worst day.
- Answer quickly and honestly, rather than aiming for the description you like.
- Pay attention to the scores, not just the labels.
- Retest occasionally, and look for broad patterns rather than exact matches.
If you want to try a trait-based approach, you can take our free Big Five personality test and see your scores on all five dimensions, including emotional stability.
The bottom line
Your MBTI type keeps changing mainly because the test splits smooth traits into two boxes, so small shifts in your answers can flip a letter. Mood, context, forced-choice questions and different test versions add to the wobble. You have not changed who you are. A trait-based test like the Big Five gives a steadier and more complete picture.
FAQ
Is it normal for your MBTI type to change?
Yes. Research has found that a large share of people get a different type when they retake the MBTI, often within weeks, mainly because they score close to the middle on one or more dimensions.
Which MBTI letter changes most often?
There is no single answer. It is usually whichever dimension you score closest to the middle on, and that varies from person to person.
Is the Big Five more reliable than the MBTI?
Generally, yes. Big Five scores tend to be consistent when adults retake them, and because they use continuous scores rather than types, small changes do not flip your result.
