What Compatibility Means in a Relationship
Research-informed: relationship science (Gottman, similarity research), conservative. An article that reports published research, not a diagnosis. Built on published relationship research (Gottman; Joel and colleagues, 2020), not on us.
By Suraj Giri · Updated · Reviewer for this method: not yet appointed (see our editorial policy)
Relationship compatibility is the degree to which two people's defaults (values, communication style, goals, conflict habits) fit without constant friction; it differs from chemistry, which is attraction.
If you want to check your own, the compatibility test hub starts with a five-question checker. It asks what you know about the other person, from a name to a shared life, and points you to the test that fits.
Most couples end up at the couple compatibility quiz: 36 statements, four for each of nine areas. You can take it alone, or send your partner a link so they answer on their own phone.
What are the areas of compatibility in a relationship?
Relationship compatibility is how well two people's everyday defaults fit: what they value, how they talk, what they want from the future and how they handle a disagreement. Compatible couples still differ; the differences just do not turn into constant friction, which is what separates compatibility from chemistry, the pull of attraction.
Our couple quiz checks nine areas. The nine are our choice of topics rather than a list research has fixed, so the third column says where a study speaks to an area and where none does.
| Area | What it covers | What research says |
|---|---|---|
| Communication | How you talk day to day and whether each of you feels heard; intellectual compatibility, enjoying the same kind of conversation, sits here | Named in our quiz; no single study isolates it |
| Values | What each of you thinks matters most | In a study of newlyweds, similar attitudes did not go with a better marriage, while similar personalities did (Luo and Klohnen, 2005) |
| Life goals | Where you each want the next years to go: home, work, children | Named in our quiz; no single study isolates it |
| Intimacy | Affection, closeness and how easily you talk about both | Sexual satisfaction was one of the five strongest predictors of how people rated their relationship across 43 studies (Joel and colleagues, 2020) |
| Conflict style | What happens between you when you disagree | Conflict was among the same five predictors (Joel and colleagues, 2020); the Gottman Institute names four harmful patterns, below |
| Humour | Whether you laugh at the same things | Named in our quiz; no single study isolates it |
| Finances | How you earn, spend and save | Named in our quiz; no single study isolates it |
| Trust | Whether you rely on each other's word | Named in our quiz; no single study isolates it |
| Emotion | How you respond to each other's feelings | Named in our quiz; no single study isolates it |
A blank research cell means we found no single study that isolates that area. It does not mean the area matters less to a couple.
What does research say makes a relationship work?
The largest study of its kind pooled 43 long-term studies from 29 laboratories, 11,196 couples in all (Joel and colleagues, 2020). It used machine learning to find which answers best predicted how people rated their relationship. The strongest were judgments about the relationship itself: how committed people thought their partner was, how appreciated they felt, their sexual satisfaction, how satisfied they thought their partner was, and how much conflict they had. Those judgments explained about 45 percent of people's current satisfaction. Personality traits and the partner's own reports added nothing beyond them. And change over time was largely unpredictable: nothing in the data said which relationships would get better or worse.
Similarity is a weaker sign than most checklists suggest. In 291 newlywed couples, partners were alike in attitudes, but that likeness did not go with a better marriage, while likeness in personality did (Luo and Klohnen, 2005). A review of 313 studies found that actual similarity stopped predicting attraction once people were in a relationship, while feeling similar kept predicting it (Montoya and colleagues, 2008).
What are Gottman's Four Horsemen?
The Gottman Institute, which carries on John Gottman's work with couples, names four ways of arguing that it calls the Four Horsemen:
- Criticism: attacking the person rather than the thing that happened.
- Contempt: mockery, sarcasm or eye-rolling that treats the other person as beneath you.
- Defensiveness: meeting every complaint with an excuse or a counter-complaint.
- Stonewalling: shutting down and withdrawing from the conversation.
Each one describes a behaviour in a conversation, not a trait of a person. The Gottman Institute calls contempt the single greatest predictor of divorce.
What are perpetual problems in a relationship?
John Gottman's research reports that about 69 percent of couples' conflicts are perpetual, rooted in lasting differences, rather than solvable. The Institute treats those lasting differences as normal; what it looks at is how a couple talks about them.
Is chemistry the same as compatibility?
No. Chemistry is the pull of attraction toward one person, close to what psychologist Robert Sternberg called passion in his triangular theory of love (1986). Compatibility is how two lives fit over time, and a couple can have either one without the other. What research found about each is on the page on chemistry versus compatibility.
How do you know if you are compatible?
You are likely compatible when you trust each other's commitment, feel appreciated and argue without contempt. Those are close to the judgments the largest couples study tied to satisfaction, and the full list, with its mirror image, is on signs you are compatible.
Does compatibility matter more in marriage?
Research gives marriage no separate rule: the findings above come from long-term couples. Marriage adds long-range questions about children, money and where to live, and several traditions claim to read it as well. How the questionnaire, sun signs, kundli matching and numerology compare is set out in which marriage check to use.
Where does intimacy fit in compatibility?
Sexual satisfaction was one of the five relationship judgments that best predicted satisfaction in the 2020 study, so intimacy is part of compatibility rather than a separate subject. What research links it to, and how couples talk about it, is on sexual compatibility in a relationship.
Which questions help couples check compatibility?
Questions are the easiest way to compare defaults: each partner answers alone, then you compare. Twenty-one of them, grouped by area, are on compatibility questions for couples.
What else is relationship compatibility called?
Relationship compatibility has several other names, and they do not all mean the same thing.
- Compatibility chart: usually a grid of the twelve star signs showing how astrology rates each pair. The zodiac compatibility chart on this site is that grid, and it belongs to a tradition, not to research.
- Love match: an everyday phrase for two people who suit each other, used by astrologers and name games as often as by couples.
- Love compatibility: the site's central term. Every method here measures it in its own way: names as a game, signs and birth dates as a tradition, and the couple quiz as a Research-informed questionnaire.
- Romantic compatibility: compatibility between partners, as opposed to friends or colleagues.
What do the 2-2-2, 3-3-3, 7-7-7 and 3-6-9 rules mean?
The rules of thumb are folk rules, not research: they spread on social media, and none comes from a study. The table gives what each one says and where it stands.
| Rule | What it says | Evidence status |
|---|---|---|
| 2-2-2 | A date night every two weeks, a weekend away every two months, a week away every two years | Folk rule, not research |
| 3-3-3 in dating | Three checkpoints, after three dates, three weeks and three months, to decide whether to go on | Folk rule, not research |
| 3-3-3 in marriage | Usually the "3 by 3" rule: each week, three hours of undivided time together and three hours alone for each partner | Folk rule, not research |
| 7-7-7 | A date every seven days, a night away every seven weeks, a holiday every seven months | Folk rule, not research; the Gottman Institute calls it "a viral social media meme" |
| 3-6-9 | Checkpoints at three, six and nine months: roughly the honeymoon, conflict and decision stages | Folk rule, not research |
| Three-month rule | Wait about 90 days before a big step, such as defining the relationship | Folk rule, not research; the crush version has no research behind it |
The FAQ below answers each one in a sentence.
Where do attachment styles fit?
Attachment style is another lens researchers use to describe how people seek closeness and handle distance, and it has its own page on attachment styles in relationships.
Sources
Studies and papers
- Joel, Eastwick and colleagues (2020), Machine learning uncovers the most robust self-report predictors of relationship quality across 43 longitudinal couples studies: PNAS 117(32), 19061 to 19071; 11,196 couples; about 45 percent of current satisfaction; change over time largely unpredictable
- Luo and Klohnen (2005), Assortative mating and marital quality in newlyweds: Journal of Personality and Social Psychology 88(2); 291 newlywed couples
- Montoya, Horton and Kirchner (2008), Is actual similarity necessary for attraction?: Journal of Social and Personal Relationships 25(6); meta-analysis of 313 studies
- Sternberg (1986), A triangular theory of love: Psychological Review 93(2); passion as one of three components
Organisations and other pages
- The Gottman Institute, The Four Horsemen: Criticism, Contempt, Defensiveness, and Stonewalling: The four names; contempt as the single greatest predictor of divorce
- The Gottman Institute, R is for Repair (2014): Repair attempts and the failure of repair
- The Gottman Institute, Research: Couples: Source of the 69 percent perpetual problems figure
- The Gottman Institute, Managing Conflict: Solvable vs. Perpetual Problems: Perpetual problems
- Gottman and Silver, The Seven Principles for Making Marriage Work (1999)
- The Gottman Institute, the 7-7-7 rule
- Psychology Today, Should daters follow the 3-3-3 rule? (Bruce Y. Lee, 2026)
- Psychology Today, How to use the 3-6-9 rule for a relationship
- marriage.com, the 3 by 3 rule in marriage
- marriage.com, the 2-2-2 rule
- Calm, What is the three-month rule?