Love Compatibility
Fun compatibility estimate using names and birthdays.
About the Love Compatibility
A bit of fun: feed in two names and two birthdays and get a compatibility percentage. It is a deterministic mix of the letters and dates you type — entertainment, not insight.
How to use it
- Enter the first name and birth date.
- Enter the second name and birth date.
- Read the score.
The formula
This is a novelty score. But the underlying question — what actually predicts whether a relationship lasts — has been studied seriously for decades, and the findings are far more interesting than any percentage.
Gottman's ratio: stable couples average about 5 positive interactions to every 1 negative during conflict
John Gottman's laboratory work found that observing how couples argue predicted separation with high accuracy in his samples. What mattered was not whether they fought — everyone fights — but the ratio of warmth to hostility while fighting, and the presence of four specific behaviours he called the Four Horsemen: criticism, contempt, defensiveness and stonewalling. Contempt was the strongest single predictor.
Notice what is absent from that list. Not star signs, not name spellings, not shared hobbies. The predictors are behavioural, learnable and entirely within a couple's control.
Worked examples
| Factor | What research suggests | Can you change it? |
|---|---|---|
| Conflict style | strongly predictive | yes — the most learnable of all |
| Shared values on money and children | strongly predictive | partly, through discussion |
| Responding to bids for attention | strongly predictive | yes |
| Similar personalities | weakly predictive at best | no |
| Star signs or name scores | no evidence whatsoever | not applicable |
The pattern in that table is the useful finding. Almost everything that genuinely predicts relationship success is a behaviour rather than a trait — how you argue, whether you turn toward your partner when they reach for your attention, whether you agree on the big structural questions. The things people usually screen for on dating profiles, including personality similarity, turn out to matter remarkably little.
Common mistakes
- Treating a compatibility percentage as information. Novelty calculators produce a number from names or birthdays. Nothing about either input carries relationship information.
- Assuming similar personalities matter most. Research has repeatedly found personality similarity a weak predictor. How a couple handles difference matters far more than how much difference there is.
- Believing that healthy couples do not fight. They fight regularly. The difference is the ratio of warmth to hostility during conflict and the absence of contempt, not the absence of disagreement.
- Ignoring the structural questions. Money, children, location and religion are where genuine incompatibility lives. They are also the topics couples most reliably avoid discussing early.
Terms explained
- Gottman ratio
- The roughly 5:1 balance of positive to negative interactions during conflict observed among stable couples.
- Four Horsemen
- Criticism, contempt, defensiveness and stonewalling — the conflict behaviours Gottman found most corrosive. Contempt is the most damaging.
- Bids for connection
- Small attempts to get a partner's attention. Consistently turning toward them is strongly associated with lasting relationships.
- Attachment style
- A pattern of relating — secure, anxious or avoidant — shaped early and modifiable later. Widely researched and genuinely predictive.
- Barnum effect
- Accepting vague, flattering descriptions as personally accurate. What makes compatibility readings feel insightful.
- Repair attempt
- Any effort to de-escalate mid-argument — humour, an apology, a change of tone. Whether they are accepted matters more than whether they are elegant.
Common questions
- Is this compatibility score real?
- No. It is a novelty. The genuine predictors of relationship success are behavioural — how a couple argues, whether they respond to each other's attempts to connect, and whether they agree on major life questions.
- What actually predicts a lasting relationship?
- In Gottman's observational work, the ratio of positive to negative interaction during conflict, and the absence of contempt. Shared values on money, children and location matter greatly as well.
- Do opposites attract?
- Not especially, and similarity is a weaker predictor than most people assume. What consistently matters is how differences are handled rather than how many there are.
- What are the Four Horsemen?
- Criticism, contempt, defensiveness and stonewalling. Contempt — eye-rolling, mockery, sarcasm aimed at a partner's character — is the single most corrosive.
- Is fighting a bad sign?
- No. Couples who never argue are often avoiding rather than agreeing. What matters is repairing well and maintaining far more warmth than hostility overall.
- What is a bid for connection?
- A small attempt to get a partner's attention — a comment about the weather, a hand on a shoulder. Consistently turning toward these rather than away is one of the most reliable markers of a stable relationship.
- Does astrological compatibility have any support?
- No. Studies comparing star signs against relationship outcomes find no effect. Results feel accurate because descriptions are broad enough to fit almost anyone.
- Can compatibility be improved?
- Substantially, since most of what predicts success is behaviour rather than fixed traits. Conflict style in particular responds well to deliberate practice and to couples therapy.