Name & Birthday Compatibility

How it works

Enter both names for a name-based score. Add both birthdays too, and the calculator folds in a second score based on the two dates, then combines the two, 60% names and 40% birthdays, into one final percentage. Leave the birthdays blank and it falls back to a name-only score, the same kind behind the site's Love Calculator and Crush Calculator. Want birthdays required rather than optional, with that same love or crush framing? Try the Love Calculator by Name & DOB or Crush Calculator by Name & DOB. Prefer to skip names entirely and calculate by date of birth alone? The Birthday Compatibility Calculator uses zodiac and numerology instead.

Everything runs in your browser. The birthdays you enter are never sent to a server or saved after you leave the page.

Compatibility myths worth retiring

A few ideas about compatibility get repeated so often they start to sound like settled fact, even though researchers who actually study long-term couples would disagree with most of them.

"Opposites attract" is the most common one. In practice, couples who share core values, especially around money, family, and how to spend free time, tend to report more stability than pairs who differ sharply on those fronts. Personality contrast can add spark early on, but it rarely holds a relationship together for decades.

"You'll know within the first few dates" is another. Some of the strongest long-term compatibility signals, like how someone handles conflict or responds when you're stressed, simply don't show up until real friction happens. A calm, easy start says less about long-term fit than people assume.

Then there's the idea that shared hobbies matter most. Interests are the easiest thing to bond over early, which is probably why they get overrated. Couples with almost nothing in common on paper regularly outlast couples who share every hobby, because the actual glue is how they treat each other day to day, not what they do together on weekends.

What actually makes two people compatible

None of that is what this calculator measures, so it's worth saying plainly what does. People who study long-term couples tend to point to a similar short list: shared values around money, family, and how to spend time together; how each partner acts in the moments right after a disagreement starts; and whether small requests for attention, a comment, a question, a moment of eye contact, get noticed and answered instead of brushed past.

Attachment style plays a bigger role than most people expect, too. Someone who tends to need reassurance and someone who tends to need space aren't incompatible by default, but making that pairing work takes both people understanding what's happening and adjusting for it, which is a conversation, not a percentage. Shared interests matter less than pop culture suggests. Couples who disagree on hobbies but agree on how to handle conflict consistently report more stability than couples who share every hobby but avoid hard conversations.

None of that fits into a name-and-birthday formula, and it shouldn't pretend to. This calculator is a fun, quick read and a good icebreaker, not a substitute for actually talking to the person about how you both handle stress, money, and disagreement.