BaZi Compatibility Calculator

Compare two birth charts, their Day Masters and day branches.

Your birth details

Use the local date and time on your birth record.

Person A

Birth dateGregorian calendarBirth timeRecorded local clock time

BirthplaceSelect a result to set coordinates and the historical timezone.

Calculation ruleApply true solar timeAdjust for longitude and the equation of time.

Daylight-saving time settings

If the clock time happened twice

Person B

Birth dateGregorian calendarBirth timeRecorded local clock time

BirthplaceSelect a result to set coordinates and the historical timezone.

Calculation ruleApply true solar timeAdjust for longitude and the equation of time.

Daylight-saving time settings

If the clock time happened twice

Year

Birth details are sent to the calculation service, without creating a saved chart or account.

A clear answer, with the method

Compare two birth charts, their Day Masters and day branches.

Calculation method

Both charts are calculated separately with their own birthplaces. This first comparison shows Day Masters, day-branch combinations and clashes. It does not turn a single relation into a marriage score.

Worked example

This is an illustrative example, not a personal reading.

Input: 子 / 丑
Result: Combination

Sources and conventions

The sources describe calculation or traditional conventions, not evidence that future events can be predicted. Compare results using the same settings.

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