八字 Free Four Pillars Calculator
Free BaZi Calculator and Analysis
Enter your birth date and time to calculate your Four Pillars, Day Master, Five Elements balance, and an instant introductory reading. True solar time is optional, and no sign-up is required.
- FreeChart and introductory analysis
- PrivateBirth data stays in your browser
- VerifiableMethod and test cases are published
排盘 The Calculator
Cast Your Four Pillars
One step at a time. Your answers are saved as you go.
When were you born?
Your birth date forms the foundation of your BaZi chart.
Press Enter to continue
What time were you born?
Your birth time determines the Hour Pillar, the most personal part of your chart.
Where were you born?
Your birthplace allows a more precise solar-time calculation. You may skip this step if unknown.
- 解码 Reading birth details
- 建模 Calculating Four Pillars
- 定主 Identifying Day Master
- 生成 Preparing your BaZi reading
Full Life Blueprint
Unlock your complete 12-section reading, including Career, Wealth, Relationships, Health, lucky elements, daily alignment, and personalized Feng Shui.
Your Complete Life Blueprint
Twelve personalized chapters drawn from your Four Pillars, Day Master, and Five-Element balance.
Unlock Life Blueprint
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What the free analysis includes
From birth details to your Four Pillars
This free BaZi calculator converts your birth details into four stem-branch pairs, then explains the Day Master and Five Elements behind your chart.
The Four Pillars
The Year, Month, Day, and Hour pillars each contain one Heavenly Stem and one Earthly Branch. Together they form the eight characters written as 八字, or BaZi.
Your Day Master
The Heavenly Stem of the Day Pillar is called the Day Master. It is the reference point used to discuss the other elements and relationships in a traditional chart.
Five Elements balance
The chart associates stems and branches with Wood, Fire, Earth, Metal, and Water. A simple element count is useful context, but it is not the same as a complete favorable-element analysis.
Optional true solar time
Clock time follows civil time zones. When you provide a birth city and enable correction, this calculator uses longitude to estimate local solar time before determining the Hour Pillar.
Verify the method: review the calculation rules and limitations, reproduce the public boundary test cases, or use the eight-point BaZi calculator checklist. Then learn about the Day Master, Ten Gods, and Luck Pillars.
BaZi calculator questions
What is a BaZi calculator?
A BaZi calculator converts a birth date and time into the Four Pillars of Destiny: the Year, Month, Day, and Hour pillars. Each pillar contains a Heavenly Stem and an Earthly Branch, producing the eight characters known as BaZi.
What information do I need to calculate my BaZi chart?
A birth date is required. Birth time determines the Hour Pillar, while birthplace can be used for optional true solar time correction. If the time or city is unknown, the chart should be read with those limitations in mind.
Does this BaZi calculator use true solar time?
Yes. True solar time correction is optional. When enabled with a selected birth city, the calculator adjusts the entered time using the city longitude before calculating the Hour Pillar.
Is a BaZi calculator scientifically proven?
No. BaZi is a traditional Chinese metaphysical and calendrical system, not a scientifically validated method for predicting life outcomes. The chart calculation can be reproduced, while interpretations remain cultural and symbolic.