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Chinese Gender Calendar

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Chinese Gender Calendar

Enter two dates and the traditional Chinese birth chart will tell you boy or girl. We convert both dates to the lunar calendar properly, including the Chinese New Year cutoff and leap months, so the row you land on is the right one.

What date do you know?

Used to work out her lunar age

Roughly two weeks after your last period started

Dates from 1900-01-31 to 2101-01-28 are supported. Nothing you type leaves your browser The whole calculation runs on this page.

What is the Chinese Gender Calendar?

The Chinese Gender Calendar, also called the Chinese birth chart, is a folk method for guessing whether a baby will be a boy or a girl. It uses just two inputs: the mother’s lunar age at conception and the lunar month she conceived in. Find where the two meet on a 28-by-12 grid and the cell tells you boy or girl.

Tradition holds that the chart was recovered from a Qing dynasty royal tomb roughly three centuries ago. There is no documentary evidence for that story, and the version passed around online today is best treated as folklore, which is exactly what makes it fun.

Why lunar dates change the answer

This is where most calculators quietly go wrong. The chart is not indexed by your normal age or by the Western month. It uses the traditional East Asian reckoning, where:

  • You are one year old at birth, not zero.
  • Everyone gains a year at Chinese New Year, not on their own birthday. In 2026 that date is 17 February.
  • Lunar months run from new moon to new moon, so they drift against January–December by several weeks.
  • Roughly every third year the calendar inserts a leap month, giving that year thirteen months instead of twelve.

A conception date in early February can therefore sit in the previous lunar year, one age bracket lower, and land on a completely different answer. The calculator above handles all four of these rules.

How to use it

  1. Enter the mother’s date of birth. Her lunar age is worked out for you.
  2. Enter the conception date. If you only know your due date, flip the toggle and we count back 266 days.
  3. Read the result, plus the lunar age and lunar month it used, so you can check the row yourself on the chart below.

The complete Chinese birth chart

All 28 lunar-age rows and 12 lunar-month columns, as real text you can read, search and copy. Rows go from age 18 to 45; columns are lunar months, not Western ones.

BBoyGGirl
Traditional Chinese gender prediction chart: mother’s lunar age 18 to 45 against lunar month of conception 1 to 12. Columns are lunar months, which do not correspond to January through December. B means boy, G means girl.
Lunar ageLunar1Lunar2Lunar3Lunar4Lunar5Lunar6Lunar7Lunar8Lunar9Lunar10Lunar11Lunar12
18GirlBoyGirlBoyBoyBoyBoyBoyBoyBoyBoyBoy
19BoyGirlBoyGirlGirlBoyBoyBoyBoyBoyGirlGirl
20GirlBoyGirlBoyBoyBoyBoyBoyBoyGirlBoyBoy
21BoyGirlGirlGirlGirlGirlGirlGirlGirlGirlGirlGirl
22GirlBoyBoyGirlBoyGirlGirlBoyGirlGirlGirlGirl
23BoyBoyGirlBoyBoyGirlBoyGirlBoyBoyBoyGirl
24BoyGirlBoyBoyGirlBoyBoyGirlGirlGirlGirlGirl
25GirlBoyBoyGirlGirlBoyGirlBoyBoyBoyBoyBoy
26BoyGirlBoyGirlGirlBoyGirlBoyGirlGirlGirlGirl
27GirlBoyGirlBoyGirlGirlBoyBoyBoyBoyGirlBoy
28BoyGirlBoyGirlGirlGirlBoyBoyBoyBoyGirlGirl
29GirlBoyGirlGirlBoyBoyBoyBoyBoyGirlGirlGirl
30BoyGirlGirlGirlGirlGirlGirlGirlGirlGirlBoyBoy
31BoyGirlBoyGirlGirlGirlGirlGirlGirlGirlGirlBoy
32BoyGirlBoyGirlGirlGirlGirlGirlGirlGirlGirlBoy
33GirlBoyGirlBoyGirlGirlGirlBoyGirlGirlGirlBoy
34BoyGirlBoyGirlGirlGirlGirlGirlGirlGirlBoyBoy
35BoyBoyGirlBoyGirlGirlGirlBoyGirlGirlBoyBoy
36GirlBoyBoyGirlBoyGirlGirlGirlBoyBoyBoyBoy
37BoyGirlBoyBoyGirlBoyGirlBoyGirlBoyGirlBoy
38GirlBoyGirlBoyBoyGirlBoyGirlBoyGirlBoyGirl
39BoyGirlBoyBoyBoyGirlGirlBoyGirlBoyGirlGirl
40GirlBoyGirlBoyGirlBoyBoyGirlBoyGirlBoyGirl
41BoyGirlBoyGirlBoyGirlBoyBoyGirlBoyGirlBoy
42GirlBoyGirlBoyGirlBoyGirlBoyBoyGirlBoyGirl
43BoyGirlBoyGirlBoyGirlBoyGirlBoyBoyBoyBoy
44BoyBoyGirlBoyBoyBoyGirlBoyGirlBoyGirlGirl
45GirlBoyBoyGirlGirlGirlBoyGirlBoyGirlBoyBoy

Not sure which row is yours? Use the calculator . It converts the dates for you.

How accurate is it, really?

Honestly: not accurate at all. Every peer-reviewed attempt to test the chart has put it around 50 percent, which is what you would expect from guessing. A frequently cited 2010 study in Canadian Medical Association Journal tested it against nearly 3,000 births and found no predictive value.

That does not mean it is worthless; it means it is a tradition rather than a test. Plenty of people enjoy it at a gender reveal, in a baby book, or as a bit of fun in the group chat. If you want an answer you can actually plan around, an ultrasound at around 18 weeks or a NIPT blood test from about 10 weeks is what your doctor will use.

Read the evidence

What the studies actually found, and why a 50 percent hit rate feels more convincing than it is.

Is it accurate? →

Understand lunar dates

Chinese New Year, lunar months and leap months: the parts that decide which row you land on.

The lunar calendar explained →

Frequently asked questions

Is the Chinese Gender Calendar accurate?

No. Independent studies put it at roughly 50 percent, which is what you would get by flipping a coin. It is a piece of folk tradition, not a diagnostic tool. For a real answer, an ultrasound from about 18 weeks or a NIPT blood test from about 10 weeks is what your doctor will use.

Should I use my lunar age or my actual age?

The chart is indexed by lunar age, which is typically one to two years higher than your Gregorian age. You do not need to work it out yourself: enter your real date of birth and the calculator converts it, including the jump that happens at Chinese New Year rather than on your birthday.

Which month of conception should I enter?

Enter the date you conceived, not your due date, though if you only know your due date, switch the toggle and the calculator will work backwards 266 days for you. The chart then uses the lunar month that date falls in, which rarely lines up with the Western month.

What is a lunar leap month and does it affect my result?

The Chinese calendar adds an extra intercalary month roughly every three years to stay in step with the solar year, so some years have thirteen months. If your conception date falls inside one, the calculator flags it and uses the base month number, because the traditional chart has no separate row for a leap month.

Can I use the Chinese Gender Calendar for twins?

The chart was designed for single pregnancies and returns exactly one answer, so it cannot say anything meaningful about twins. You are welcome to try it for fun, but treat the result as a novelty.

Where does the chart come from?

The traditional account is that it was found in a Qing dynasty royal tomb and is around 300 years old. There is no verifiable documentary evidence for that origin story, and the version circulating online today is best understood as folk tradition rather than a historical artefact.

Does the calculator work for ages over 42?

Yes. The full traditional chart covers lunar ages 18 to 45 and every row is implemented here, including 43, 44 and 45. Outside that range the chart simply has no data, and the calculator tells you so rather than guessing.

Is my data stored anywhere?

No. The entire calculation runs in your browser. Your dates are never sent to a server, logged, or saved.