How the compatibility score works
We think you should know exactly where a number comes from before you take it seriously.
Updated 2026-11-04 · 2 min read · TraitMix editorial team
Two ingredients
Research on couples suggests two broad things matter. First, similarity: partners who are alike on some traits report fewer daily frictions. Second, individual strengths: people who are warm, dependable and emotionally steady tend to have better relationships regardless of who their partner is. The TraitMix score combines both.
Step by step
- For each of the five traits, we measure how close the two scores are.
- We weight the traits: openness 25%, conscientiousness 25%, agreeableness 20%, extraversion 15% and emotional stability 15%. This becomes the similarity part, worth 60% of the score.
- We average both people's agreeableness, conscientiousness and emotional stability. This becomes the shared-strengths part, worth 40%.
- We rescale the result to 0–100 so that differences between pairs are easy to see.
What the score cannot tell you
Personality explains only part of how relationships go. Communication, shared experiences, life circumstances and simple effort matter at least as much. A short test also has measurement error. A 70 versus a 75 is not a meaningful difference.
A worked example
Imagine Alex and Sam. Alex scores openness 70, conscientiousness 60, extraversion 80, agreeableness 65 and emotional stability 55. Sam scores 60, 75, 40, 70 and 60.
| Trait | Alex | Sam | Gap | Closeness × weight |
|---|---|---|---|---|
| Openness | 70 | 60 | 10 | 0.90 × 25% = 0.225 |
| Conscientiousness | 60 | 75 | 15 | 0.85 × 25% = 0.213 |
| Agreeableness | 65 | 70 | 5 | 0.95 × 20% = 0.190 |
| Extraversion | 80 | 40 | 40 | 0.60 × 15% = 0.090 |
| Emotional stability | 55 | 60 | 5 | 0.95 × 15% = 0.143 |
Adding the last column gives a similarity of about 0.86. Their shared strengths, the average of both people's agreeableness, conscientiousness and emotional stability, come to about 0.64. Combining them as 60% similarity and 40% strengths gives a raw value of about 77, which is rescaled to a score of 75.
Notice what drives the result. The big extraversion gap pulls the score down, but only a little, because extraversion has a lower weight and Alex and Sam are close on everything else. In their report, the extraversion gap would appear as a likely friction point, with a tip about planning weekends.
How to read your score
- Above 80: very similar profiles and solid shared strengths. Watch for blind spots you both share, since nobody is there to balance them.
- 60 to 80: a typical range for couples and close friends. A few clear differences worth understanding.
- 40 to 60: noticeable differences on heavily weighted traits. Often a sign that you complement each other, but also that you will need to talk about routines and plans.
- Below 40: you approach life very differently. That can work well, but only with deliberate effort and clear agreements.
Why we show clashes too
A single number hides the useful part. That is why every comparison lists the traits where you click, the ones where you are likely to clash, and a practical tip for each. Those details are where real conversations start.
Ready to try? Go to Compare and add the people you want to compare.
Frequently asked questions
Why are openness and conscientiousness weighted most?
Differences in these two traits show up most often in daily friction, such as how to spend free time and how organised the home should be.
Can we raise our score?
Not by trying. The score reflects your current trait levels. What you can change is how you handle the differences it highlights.
Does the score work for friends and coworkers?
Yes. The same calculation applies, although the shared strengths matter most in close, long-term relationships.
Try these next
The 16 personality types
the quiet strategist
Independent, long-range thinker who likes a clear plan and high standards.
the curious analyst
Quiet, questioning mind that loves ideas and dislikes rigid schedules.
the decisive organiser
Energetic, direct planner who likes to lead and get things done.
the idea sparker
Lively, inventive debater who loves new possibilities and hates routine.
the thoughtful counsellor
Quiet, warm and principled, with a strong sense of purpose and a plan.
the gentle idealist
Quiet, imaginative and kind, guided by personal values more than plans.
the warm motivator
Sociable, caring organiser who brings people together around a goal.
the enthusiastic explorer
Warm, curious and spontaneous, full of ideas and new connections.
the dependable realist
Quiet, practical and thorough: does what they said, when they said.
the quiet caretaker
Gentle, loyal and organised; looks after people in practical ways.
the practical manager
Direct, organised doer who likes clear rules and visible results.
the friendly host
Sociable, caring and organised; keeps people connected and looked after.
the hands-on fixer
Calm, independent problem-solver who learns by doing.
the easygoing artist
Quiet, kind and spontaneous; lives in the moment and values harmony.
the bold doer
Energetic, practical and spontaneous; acts first and enjoys a challenge.
the lively mood-maker
Sociable, warm and spontaneous; brings fun and lives in the moment.
More guides
How to use personality tests as a couple
Practical steps for taking personality tests with your partner and talking about the results kindly: what to take, how to discuss differences and what to avoid.
Do opposites attract? What research on couples really shows
Do couples do better when they are similar or different? What research says about personality similarity, values, and the traits that matter most.
When an introvert and an extravert are together
Practical advice for couples where one partner is an introvert and the other an extravert: weekends, parties, alone time and how to talk about energy.
The five ways people show love, and how to use them
Kind words, time together, helpful acts, playfulness and personal space: how affection styles work, what research says, and how to use them in a relationship.