Free Ziwei Doushu calculator
Enter your birth details to calculate the twelve palaces, principal stars and birth-year transformations. Check the chart, then follow the reading guide. Calculation is free and needs no account.
Calculate for freeBasic calculation is free. Saving needs an account. AI readings and questions use account credits; the credits page shows current prices and your balance.
Time and calculation rules on this page
Clock time is treated as UTC+8 with a 120°E reference meridian, then corrected for birth longitude and the equation of time. The day pillar changes at corrected midnight; the month pillar follows solar-term boundaries. For births elsewhere, first convert the time to UTC+8 and correct historical daylight saving. This page does not detect overseas time zones or daylight saving automatically.
Ziwei star placement uses the lunar date and hour corresponding to true solar time. A leap month's first half belongs to the current month and its second half to the next. Choose the Five Element Bureau method in the form. Other schools may use different conventions.
Check true solar time and time zonesEnter birth time in UTC+8. Convert overseas times and historical daylight saving first; see the rules above.
Your name is optional. To continue after sign-in, birth inputs are temporarily kept in this browser tab for up to 30 minutes and can be cleared at any time. Guest charts are not saved to an account or published. Birth details never appear in the URL.
Enter birth details
Results describe a traditional interpretive system, not scientifically validated predictions. If the birth time is uncertain, compare adjacent birth hours and avoid treating one label as a fixed conclusion.