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13min readBykaucim.ai Editorial
On this page7
  1. 01The Chinese gender chart: boy or girl
  2. 02The bazi chart: your Four Pillars
  3. 03Which one are you looking for?
  4. 04A worked example: one mother, both charts
  5. 05Can the two charts be combined?
  6. 06The honest bottom line
  7. 07Related articles

Chinese Birth Chart: Gender Chart or Bazi Chart?

When people search for a Chinese birth chart, they usually mean one of two completely different things. The first is the Chinese gender chart, a folk table that supposedly predicts whether a baby will be a boy or a girl from the mother's lunar age and the lunar month of conception. The second is the bazi chart, also called the Four Pillars of Destiny, a full astrological chart built from your birth year, month, day, and hour.

The quickest way to tell which one you want: if you are pregnant, or someone you know is, and the question is boy or girl, you want the gender chart. If the question is about your own personality, career, relationships, or timing in life, you want the bazi chart. The two systems share nothing except the word birth and the Chinese lunar calendar.

This guide explains what each chart is, what it can and cannot tell you, and how to read your own for free.

The Chinese gender chart: boy or girl

The gender chart is a single table, usually shown as a grid. One axis lists the mother's lunar age from 18 to 45. The other lists the twelve lunar months. Each cell contains one of two answers: boy or girl. You find the mother's lunar age at conception, find the lunar month when conception happened, and read the cell where they cross.

Legend says the table was kept in the Qing imperial court for consorts and spread from there. Historians have found no verified source, and the honest way to describe it is as a widely loved piece of folk culture, closer to an almanac than to any medical document.

Two details trip almost everyone up:

Because of these two conversions, reading the raw table by hand goes wrong often. Our free Chinese gender calendar calculator does both conversions automatically: you enter the mother's birth date and a rough conception date in Western dates, and it reads the chart for you.

How accurate is the gender chart?

About 50 percent, the same as a coin flip. Medical researchers have tested the chart against millions of real birth records, and it performs no better than chance. We wrote up the studies in detail in our accuracy review. Enjoy it as a family game and a piece of tradition. For the real answer, an ultrasound or NIPT test at your doctor's office is the only reliable source.

The bazi chart: your Four Pillars

The bazi chart is a different animal entirely. Bazi means eight characters. Your birth year, month, day, and hour each contribute one pillar, and each pillar consists of two characters: a Heavenly Stem and an Earthly Branch. Eight characters total, hence the name.

Each character carries one of the five elements: wood, fire, earth, metal, or water. A bazi reading looks at how the elements in your chart balance and interact. Traditional practitioners use it to describe temperament, strengths, blind spots, and timing: which years favor career moves, when relationships come under pressure, where money tends to flow or leak.

A few things distinguish it from the gender chart:

If that is what you came for, you can generate your bazi chart free on our calculator, and our guide to the Chinese astrology calculator and bazi birth charts explains what each part of the output means.

Our view on bazi, for the record: we treat it as a structured mirror for self-reflection rather than a verdict on your future. The element patterns give you vocabulary for tendencies you may recognize in yourself. What you do with that recognition stays entirely in your hands.

Which one are you looking for?

Run through these quick checks:

A worked example: one mother, both charts

Concrete numbers make the difference obvious. Take a mother born on June 15, 1992, with an estimated conception date of May 1, 2026.

For the gender chart, two conversions happen first. Her lunar age in 2026: she was born in lunar year 1992, conception falls in lunar year 2026, so her lunar age is 2026 minus 1992 plus one, which is 35. The conception date of May 1, 2026 falls in the third lunar month that year. Reading the chart at lunar age 35, third month gives: girl. That is the entire reading. Two inputs, one cell, one answer, and a 50 percent chance of matching the ultrasound.

For her bazi chart, the same birth date of June 15, 1992 is only the starting point. 1992 was a Water Monkey year, which fixes her year pillar. The month and day fix two more pillars, and her birth time, say 9:40 in the morning, fixes the hour pillar. The resulting eight characters describe her elemental makeup, not her baby. A practitioner might note which element dominates, which is missing, and what that pattern suggests about how she handles pressure or money. None of it says boy or girl.

Same person, same birthday, two charts answering two unrelated questions. That is the whole distinction.

Can the two charts be combined?

Not really, and no tradition says they should be. The gender chart is a folk table about an unborn baby. The bazi chart is a metaphysical profile of a person already born. Some expecting parents enjoy both, checking the gender chart for fun during pregnancy and later casting a bazi chart for the newborn once the birth date and time are known. That order makes sense: the baby's own bazi chart can only exist after birth, because it needs the actual birth moment.

One genuine connection: both systems run on the Chinese lunisolar calendar, and both use lunar age reckoning where age increments at Lunar New Year rather than on your birthday. Learn the conversion once and you can navigate both. Our lunar age guide covers it with worked examples.

The honest bottom line

The gender chart is entertainment with imperial packaging, and the studies confirm it: 50 percent accuracy, coin-flip territory. The bazi chart is a rich, centuries-old interpretive system that rewards curiosity about yourself, as long as you hold it as reflection rather than prophecy. Both are free to try, and knowing which one you actually want saves you from reading the wrong chart for the wrong question.

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Frequently asked questions

Is a Chinese birth chart accurate for predicting a baby's gender?

No. Medical studies that checked the Chinese gender chart against millions of birth records found it right about 50 percent of the time, the same as random guessing. Treat it as a fun tradition. Only medical checks such as an ultrasound or NIPT can tell you your baby's sex.

What information do I need for a bazi birth chart?

Your birth date and, ideally, your birth time. The year, month, day, and hour each form one pillar of the chart, so a missing birth time leaves one pillar blank. The gender chart, by contrast, only needs the mother's birth date and an approximate conception date.

Are the Chinese gender chart and the bazi chart related?

Only through the calendar. Both use the Chinese lunisolar calendar and lunar age, where age increases at Lunar New Year. Beyond that they are unrelated: the gender chart is a folk table about an unborn baby, while bazi is an astrological profile of a person already born.

Can I read a Chinese birth chart for free?

Yes, both kinds. Our Chinese gender calendar calculator converts your dates to lunar age and lunar month automatically and reads the table for you, and our bazi calculator generates your Four Pillars chart from your birth details. Both are free to use.

Why does my lunar age differ from my real age?

Lunar age starts at one on the day you are born and adds one at each Lunar New Year instead of on your birthday, so it typically runs one to two years ahead of your Western age. Both the gender chart and bazi use this reckoning.

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kaucim.ai Editorial writes from Hong Kong about Chinese divination traditions: fortune sticks at Wong Tai Sin Temple, bazi astrology, palmistry, and folk charts. We treat every reading as a mirror for reflection rather than a prediction, and we say plainly what the evidence supports.