Introduction
This Bazi calculator turns your birth date, time, and place into a Chinese astrology chart called the Four Pillars of Destiny (八字). Each pillar holds two symbols: a Heavenly Stem and an Earthly Branch. Together, the four pillars form a map of your Year, Month, Day, and Hour of birth.
Just fill in your birth details and press calculate. The tool then shows you:
- Your four pillars, with the five elements colored for easy reading
- Your Day Master — the stem that stands for you — and how strong or weak it is
- Your five element balance (Wood, Fire, Earth, Metal, Water) and which elements help or hurt you
- Your Ten Gods, which show themes like wealth, career, study, and family
- Your Shen Sha stars, the lucky and unlucky markers in your chart
- Your Luck Pillars (大運) and yearly phases (流年), so you can see how time shifts your chart
The math here follows real Chinese calendar rules, not shortcuts. Your Bazi year starts at Lì Chūn (about February 4), not January 1. Your month pillar comes from the Sun's true position, not the calendar month. You can enter a solar (Gregorian) or lunar (Chinese) date, and leap months are handled too. If you only want the animal sign for a birth year, the Chinese Zodiac Calculator gives you that in one step.
Two settings matter a lot for your Hour Pillar. Daylight Saving Time is found for you from old records, since a clock set one hour ahead can push you into the wrong two-hour block. True Solar Time then fixes your time using your longitude and the equation of time. If that change moves you into a new Shichen, the tool warns you. Working across regions? Our Time Zone Calculator and military time calculator help you write the birth moment down correctly before you enter it here.
Don't know your birth time? Tick the box and you still get a three-pillar chart. Every term is shown in Chinese, Pinyin, and English, so you can learn as you read. A step-by-step section shows all the math, and a live panel shows the pillars for right now. If you enjoy this system, the Western equivalent is our Birth Chart Calculator, which also needs an exact birth time.
How to use our Bazi Calculator
Enter your birth date, birth time, gender, and birthplace. The calculator returns your Four Pillars (BaZi) chart with your Day Master, Five Elements balance, Ten Gods, Shen Sha stars, pillar interactions, Luck Pillars, and a step-by-step solution.
Calendar system: Pick Solar (Gregorian) if your birth record uses a normal calendar date. Pick Lunar (Chinese) if it uses a Chinese lunar date. Lunar dates are changed to solar dates for you.
Birth year: Choose the year you were born, from 1924 to 2026. Not sure of the year from an age on a document? Check it with the Birth Year Calculator or the Age Calculator.
Birth month: Choose the month you were born. Lunar mode shows Chinese month names.
Birth day: Choose the day of the month. Only valid days show up.
Leap month 閏月: This box only shows in Lunar mode. Tick it only if your record says leap or 閏.
Gender: Pick male or female. This is required, because gender plus your year stem sets the direction your 10-year Luck Pillars run.
Approx. birth time (Shichen): Pick the two-hour Chinese time block you were born in. This sets your Hour Pillar.
Exact clock time: Type the exact time from your birth record. The tool then picks the right Shichen for you using True Solar Time.
Birth time is unknown: Tick this box if you do not know your birth time. You will get a three-pillar chart with no Hour Pillar.
Country / region: Pick the country where you were born. This unlocks the city list.
City / area: Pick the closest city. This fills in the longitude and the old daylight saving rules for that place.
Longitude: This fills in on its own from the city. Change it if you know the exact longitude of your birthplace.
Standard time zone: Pick the UTC offset used at your birthplace, without any summer-time shift. The Time Zone Difference Calculator is handy if the record was written in another country's local time.
Daylight Saving Time: The tool checks history and sets this for you. Flip the switch if your birth record says something different.
True Solar Time correction: Leave this on to line your birth time up with the real position of the sun. It can move you into a different Shichen and change your Hour Pillar.
Calculate My Bazi Chart: Click this to build your chart. Use Reset to clear everything and start over.
Terminology display mode: Choose English only, Chinese plus English, or Chinese plus Pinyin plus English for all labels and star names.
What Is Bazi (八字) — The Four Pillars of Destiny?
Bazi is a Chinese astrology system that turns your birth date and time into eight Chinese characters. That is where the name comes from: ba means eight and zi means characters. The eight characters sit in four pairs called pillars: the Year, Month, Day, and Hour pillar. Together they are called the Four Pillars of Destiny (四柱). Readers use this chart to talk about your nature, your strengths, your family, your work, and the timing of good and hard years.
Stems and Branches
Each pillar has two parts. On top sits a Heavenly Stem (天干). There are 10 stems, and each one is a Yin or Yang form of one of the five elements. Below it sits an Earthly Branch (地支). There are 12 branches, and each one matches a zodiac animal like Rat, Ox, or Tiger. Stems and branches pair up in a repeating 60-step cycle called the Jiazi (甲子). That cycle is why a Chinese birth year chart repeats only once every 60 years.
The Five Elements
Every stem and branch belongs to one of five elements: Wood, Fire, Earth, Metal, and Water. The elements feed and control each other:
- Feeding cycle: Wood feeds Fire → Fire makes Earth → Earth makes Metal → Metal holds Water → Water grows Wood.
- Control cycle: Wood breaks Earth → Earth blocks Water → Water puts out Fire → Fire melts Metal → Metal cuts Wood.
A chart that has too much of one element, or none of another, is read as out of balance. The elements you need are called favourable elements, and the ones that push you further off balance are unfavourable.
The Day Master
The stem of your Day pillar is called the Day Master (日主). It stands for you. Everything else in the chart is judged by how it helps or fights this one character. If the chart holds a lot of your own element and the element that feeds it, the Day Master is called strong. If those are thin, it is called weak. Strong and weak are not good or bad — they only tell you what kind of help the chart wants. The strength score here is a weighted share, much like a Weighted Average Calculator result, with the month branch counting most.
The Ten Gods
The Ten Gods (十神) name the link between the Day Master and every other stem in the chart. They fall into five jobs: self (peers and rivals), output (talent and speech), wealth (money and assets), officer (rules, bosses, and pressure), and resource (support, learning, and mentors).
Hidden Stems and Shen Sha Stars
Each branch also holds one to three hidden stems (藏干). They do not show on the surface, but they still add weight to the elements and bring their own Ten Gods. Charts also carry Shen Sha stars (神煞) — old symbolic tags such as the Nobleman, the Literary Star, the Traveling Horse, and Peach Blossom. Some are lucky, some are not, and many are mixed.
Luck Pillars and Annual Years
A Bazi chart does not stand still. Luck Pillars (大運) are 10-year blocks of time that each add one extra stem and branch to your chart. Your gender and the Yin or Yang of your year stem decide if the blocks run forward or backward through the cycle. The start age comes from the days between your birth and the nearest solar term, where about 3 days equals 1 year. Inside each block, every calendar year (流年) adds its own pillar too. Where these new stems and branches clash, harmonize, or punish your natal pillars is how Bazi talks about timing. Western astrology marks its own long cycles the same way — see the Saturn Return Calculator for that version.
Why the Start Dates Are Not January 1st
Bazi follows the sun, not the regular calendar. The Bazi year begins at Li Chun (立春), around February 4. So a baby born in late January belongs to the year before. Months are set by the 24 solar terms as well, not by the number on a wall calendar. To count exact days between two of these dates, the Date Duration Calculator and the Julian Date Calculator use the same day-number math this tool runs internally.
Birth Time, Shichen, and True Solar Time
The day is split into twelve two-hour blocks called Shichen (時辰), and each one gets a branch. The Rat hour starts at 23:00, and a birth after 23:00 counts toward the next day's pillar. Because clock time is set by time zones, not by where the sun really is, Bazi uses True Solar Time (真太陽時). Two fixes are added: one for how far your birthplace sits from the middle of its time zone (4 minutes per degree), and one from the equation of time, which comes from the tilt and oval orbit of the Earth. Daylight saving must also be taken back out. These small fixes matter, because a shift of a few minutes can move a birth into a different Shichen and change the whole Hour pillar. If the birth time is unknown, the chart is read with three pillars only.
Related Charts and Tools
Bazi is one of several birth-based systems. If you want to explore further, try the Life Path Number Calculator and the Numerology Calculator for number-based readings, the Rising Sign Calculator and Moon Sign Calculator for the Western placements that also depend on exact birth time, or the Sun Moon Rising Calculator for all three at once. For a lighter read, the Biorhythm Calculator tracks daily cycles from the same birth date.