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Chinese Gender Predictor
The famous Chinese gender calendar, done properly: we convert your dates to the Chinese lunar calendar, find your lunar age and lunar conception month, and read the traditional chart. It's folklore, not medicine — and it's a lot of fun to argue about.
What is the Chinese gender calendar?
The Chinese gender calendar — also called the Chinese gender chart, the Chinese birth chart or, in Chinese, the Qing Gong Biao ("Qing palace chart") — is a grid that claims to predict whether a baby will be a boy or a girl. Down the side runs the mother's age; across the top runs the month the baby was conceived. Where the two meet, the chart says boy or girl.
The legend is as good as the chart is famous: it is said to have been found in a royal tomb near Beijing around 700 years ago and to have been used by the imperial court to plan heirs. There is no historical evidence for that story, and versions of the chart that circulate online differ in a handful of cells. What is true is that it has been passed around families for generations, and that almost every expecting parent who hears about it wants to try it at least once.
Lunar age: why the chart may use a different age than yours
The chart does not use your ordinary birthday age. It uses your lunar age, known in Chinese as xusui. In the traditional count you are already one year old on the day you are born, and everyone gets one year older together at Chinese New Year — not on their birthday.
So your lunar age at conception is: the lunar year of conception, minus the lunar year you were born in, plus one. The Chinese year starts at Chinese New Year, which moves between 21 January and 20 February. That means someone born in January 1995 (before Chinese New Year on 31 January 1995) belongs to lunar year 1994, not 1995. In practice your lunar age is usually one or two years higher than your Western age, which is exactly why doing it by hand so often gives a different answer. Our predictor works this out for you from your exact date of birth.
The lunar conception month
The columns of the chart are lunar months, not January to December. A Chinese lunar month starts on a new moon and lasts 29 or 30 days, so lunar months drift against the Western calendar from year to year. The first lunar month begins on Chinese New Year — in 2026 that was 17 February; in 2025 it was 29 January; in 2024 it was 10 February.
About seven years in every nineteen, the Chinese calendar adds a thirteenth, "leap" month so it stays in step with the seasons. The chart has only twelve columns, so the usual convention — and the one we use — is to read a leap month in the same column as the month it repeats. If your conception date falls in a leap month, the result screen tells you.
The chart needs the month you conceived, not the month you are due. Most people don't know their exact conception date, so you can enter your due date instead: pregnancy is dated 40 weeks from the last period, and conception usually happens about two weeks after that, so we estimate conception as the due date minus 266 days (38 weeks). If that estimate lands within a few days of a lunar month change, try a date on either side — the chart may flip.
How to use the Chinese gender predictor
1. Enter the mother's date of birth. 2. Choose whether you know the conception date or only the due date, and enter it. 3. Tap the button. We convert both dates to the Chinese lunar calendar, calculate the mother's lunar age and the lunar conception month, and look up that cell on the traditional chart shown below — so you can check our working yourself.
Everything happens on your own phone or computer. Nothing you type is sent to us or anyone else, and nothing is saved: close the page and it's gone. The chart covers mothers with a lunar age of 18 to 45; outside that range it simply has no answer.
The honest truth: how accurate is it?
About as accurate as flipping a coin. Researchers have tested the chart against real births, and the biggest check — a study published in 2010 in the journal Obstetrics & Gynecology that looked at roughly 2.8 million births in Sweden — found it predicted the baby's sex correctly about 50% of the time. Smaller studies in the United States came to the same conclusion. Since boys and girls are born in almost equal numbers, any guess at all is right about half the time.
The baby's sex is set at conception by the chromosomes in the sperm cell; neither the mother's age nor the phase of the moon plays a role. So please treat this as entertainment, not medicine, and never make a decision based on it. If you want the real answer, a cell-free DNA blood test (often called NIPT) can report the baby's sex from around 10 weeks, and the anatomy-scan ultrasound at roughly 18–22 weeks is when most parents find out. Plenty of families keep that result sealed and reveal it at a party — which is where we come in.
The full traditional chart
Rows: mother's lunar age at conception (18–45). Columns: lunar month of conception (1–12). B = boy, G = girl.
| Age | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 18 | G | B | G | B | B | B | B | B | B | B | B | B |
| 19 | B | G | B | G | G | B | B | B | B | B | G | G |
| 20 | G | B | G | B | B | B | B | B | B | G | B | B |
| 21 | B | G | G | G | G | G | G | G | G | G | G | G |
| 22 | G | B | B | G | B | G | G | B | G | G | G | G |
| 23 | B | B | G | B | B | G | B | G | B | B | B | G |
| 24 | B | G | B | B | G | B | B | G | G | G | G | G |
| 25 | G | B | B | G | G | B | G | B | B | B | B | B |
| 26 | B | G | B | G | G | B | G | B | G | G | G | G |
| 27 | G | B | G | B | G | G | B | B | B | B | G | B |
| 28 | B | G | B | G | G | G | B | B | B | B | G | G |
| 29 | G | B | G | G | B | B | B | B | B | G | G | G |
| 30 | B | G | G | G | G | G | G | G | G | G | B | B |
| 31 | B | G | B | G | G | G | G | G | G | G | G | B |
| 32 | B | G | B | G | G | G | G | G | G | G | G | B |
| 33 | G | B | B | B | G | G | G | B | G | G | G | B |
| 34 | B | G | B | G | G | G | G | G | G | G | B | B |
| 35 | B | B | G | B | G | G | G | B | G | G | B | B |
| 36 | G | B | B | G | B | G | G | G | B | B | B | B |
| 37 | B | G | B | B | G | B | G | B | G | B | G | B |
| 38 | G | B | G | B | B | G | B | G | B | G | B | G |
| 39 | B | G | B | B | B | G | G | B | G | B | G | G |
| 40 | G | B | G | B | G | B | B | G | B | G | B | G |
| 41 | B | G | B | G | B | G | B | B | G | B | G | B |
| 42 | G | B | G | B | G | B | G | B | B | G | B | G |
| 43 | B | G | B | G | B | G | B | G | B | B | B | B |
| 44 | B | B | G | B | B | B | G | B | G | B | G | G |
| 45 | G | B | B | G | G | G | B | G | B | G | B | B |
Month 1–12 →
Chinese gender calendar FAQ
Is the Chinese gender predictor accurate?
No more than chance. A 2010 study of about 2.8 million Swedish births found the chart right roughly 50% of the time — the same as a coin toss. It's a fun tradition, not a medical test.
How do I calculate my lunar age?
Take the lunar year of conception, subtract the lunar year you were born in, and add one. Lunar years begin at Chinese New Year (between 21 January and 20 February), so if you were born in January or early February you may belong to the previous lunar year. The predictor above does this automatically.
Should I use my conception date or my due date?
The chart is built on the conception month. If you only know your due date, choose "due date" and we estimate conception as the due date minus 266 days (38 weeks).
What happens if I conceived in a lunar leap month?
The chart has only 12 columns, so a leap month is read in the column of the month it repeats — a leap 6th month uses column 6. We tell you on the result screen if this applies.
Why do different Chinese gender charts give different answers?
Sites use different ages (Western age instead of lunar age), different months (the Western month, or even the due month) and slightly different copies of the chart. Ours converts both to the lunar calendar and uses the most widely published version of the chart, cross-checked against several sources.
Is my information stored or shared?
No. The calculation runs entirely in your browser. Your dates are never sent to our servers or anyone else, and nothing is saved.
When can I really find out if it's a boy or a girl?
A cell-free DNA blood test (NIPT) can tell you from around 10 weeks, and the anatomy-scan ultrasound at about 18–22 weeks is when most parents find out. Ask your doctor or midwife what's available where you live.
How can I turn the prediction into a gender reveal?
Get everyone to lock in their guess, then reveal it together. Diaper Reveal is a free online gender reveal party: family joins from their phones on live video, votes team boy or team girl, plays a quick race and quiz, and watches the reveal at the same moment — with a highlight video at the end.
The chart guesses. Your family finds out for real.
Let everyone vote boy or girl, then reveal it live together — a free online party with a race, a couple quiz and a highlight video. No app, no account.