How compatible
are you, really?
Two birthdays, one reading, across the six things that actually matter in a relationship.
For any two people: any genders, any relationship
How to fill it in and read it
Fill in one column per person. Type the year, then pick the month and day; birth time and birthplace are optional. With only the date, the match uses the year, month and day pillars. Adding the time brings in the hour pillar, and adding the birthplace converts that time to true solar time for a more precise hour pillar. Names only make the result easier to read, so a nickname is fine. The match works for any two people of any gender: partners, spouses, friends, family or coworkers.
An example: Alex was born in Taipei at 8:30 a.m. on May 12, 1990; Sam was born on August 3, 1992 at an unknown time. For the first person enter 1990, May, 12, 08:30 and Taipei; for the second, just 1992, August, 3. Press the button and you get an overall score from 0 to 100, plus a score and a short explanation for each of six areas.
The scores describe the rhythm of the relationship: where things flow and where they tend to snag. Start with the lowest-scoring area, since that is usually what the two of you most need to talk through. To go deeper, links to the marriage match, business partnership and synastry readings appear below the result.
Frequently asked questions
What does a BaZi compatibility reading look at?
It sets two birth charts side by side and scores six areas from these: how the two Day Masters' elements interact, whether the day stems combine, how the day branches (the spouse palace) combine, clash, punish or harm each other, combinations and clashes across all four pillars, and Five Element complement (whether one chart has the elements the other lacks, and whether the two together come out more even). The score is only a summary; the notes under each area are what to read. Spouse Star and favorable-element fit are a separate layer this tool does not score; for the full method, see BaZi marriage compatibility.
Do we have to be a couple?
No. Any two people can be compared: friends, family or business partners, regardless of gender.
Can we do it without knowing the birth time?
Yes. Birth time is optional; without it the reading uses the year, month and day pillars. If you add the time and birthplace, it is converted to true solar time for a more accurate hour pillar.
Does a low score mean we should not be together?
No. A low-scoring area is where the two of you need to talk more, and it is worth doing that early. Whether to go on together is still for the two of you to decide. This is for reflection and entertainment only.
Are our birth dates stored?
Not the birth dates you enter here. The reading is calculated in your browser, and neither person’s birth data is sent to our servers. If you sign in, the birth details you save to your account and any charts you save are kept in our database, and you can delete them at any time. See our Privacy Policy.
For reflection and entertainment. Not medical, financial, or relationship advice.
Your birth details are calculated in your browser and are not sent to our server. For how we handle data when you create an account, subscribe to the newsletter, or see ads that use cookies, see our Privacy Policy.
Feeling low? In the US, call or text 988 (Suicide & Crisis Lifeline, 24/7); outside the US, contact your local crisis or emergency services.
About ·
Methodology ·
Contact ·
Disclaimer ·
Privacy Policy ·
Terms of Use ·
Open-Source Licenses
© 2026 KnowYourBaZi (compilation, editing and code)