The Chinese gender calendar is a 28-by-12 folk table that reads boy or girl from the mother's lunar age at conception and the month of conception, with each cell of the grid marked for one sex or the other. The same grid is widely shared under the names Chinese Birth Calendar and Qing palace chart, and it has been used for generations as a playful way to guess a baby's sex long before any medical test could. Historians cannot confirm the legend that an original was kept on a scroll in a royal Qing-dynasty tomb near Beijing and used to predict imperial heirs, and no dynasty-era original survives, so what circulates today is a reproduction passed down as folklore rather than a verified historical artifact.
For a quick run-through, the Chinese Gender Predictor turns the centuries-old chart into a one-tap guess: pick the mother's age at conception and the month she conceived, and the tool instantly reads the traditional grid to show boy or girl. Everything happens in your browser, so the page stores nothing and sends nothing to a server. Treat every result as entertainment, because the chart is a folk-tradition game, not a medical test, and controlled reviews have found it about as accurate as a coin flip.
What the Chinese Gender Calendar Actually Is
The Chinese gender calendar is a simple two-axis table. One axis lists the mother's age at conception, and the other lists the month of conception. Wherever the two lines cross, the cell is marked boy or girl. That is the whole mechanism: there are no formulas, no hormones, no scans, just a fixed grid of pre-printed predictions handed down as folklore.
The chart is also called the Chinese Birth Calendar or, more colorfully, the Qing palace chart. Legend has it that the original was found on a scroll in a royal Qing-dynasty tomb near Beijing and used to guess the sex of imperial heirs. Historians cannot confirm that story, and no dynasty-era original survives. What you find online or in parenting books today is a widely shared reproduction rather than a verified historical document. Treat it the way it has been used for generations: as a playful ritual at a gender-reveal party, a baby shower, or a chat with friends, not as a way to plan a nursery.
How the Chart Is Built: Lunar Age and Conception Month
The traditional chart is a 28-by-12 grid. The 28 rows cover the mother's lunar age at conception, running from 18 to 45. The 12 columns cover the lunar month of conception, numbered 1 to 12 in the Chinese lunar calendar. Each of the 336 cells is pre-marked boy or girl, so a prediction is just a matter of locating the right cell and reading its label.
Two details separate the chart from a plain age lookup. First, the age axis is Chinese lunar, or nominal, age: in that system a baby is 1 at birth and gains a year at Lunar New Year, so nominal age is usually your real age plus about one. Second, the month axis is the lunar month of conception, which drifts a few weeks from the Western calendar and can fall in a different month than the Gregorian date you remember.
The Chinese Gender Predictor keeps things simple: enter your everyday age and the calendar month you conceived, and it reads the grid as an approximation. If you want a stricter reading, add one year to your age and convert your conception date to the Chinese lunar calendar first.
How to Read the Chinese Gender Calendar
Reading the chart by hand means lining up two values and looking at the cell where they cross. The tool does this lookup for you, and the steps below walk through exactly what to enter.
- Enter the mother's age at the time of conception, between 18 and 45. For a stricter match to the original chart, add one year so it lines up with Chinese lunar age; otherwise your everyday age works as an approximation.
- Choose the month conception happened. Pick the ordinary calendar month for a quick read, or convert the date to a Chinese lunar month first for a closer match to the original grid.
- Read the instant boy-or-girl prediction the chart returns. Treat the answer as entertainment, screenshot it for a reveal, and compare it with other old wives' tales if you like.
Lunar Age, Western Age, and the Calendar Month
The biggest source of confusion when reading the chart is which age and which month to enter. The original uses Chinese lunar age and the lunar month of conception, while most people only know their Western age and the Gregorian calendar month. The table below shows the rough relationship, so you can decide how strict you want to be.
| Western age at conception | Approximate Chinese lunar age | When this band matters |
|---|---|---|
| 18 to 24 | 19 to 25 | Younger mothers, lunar age shifts the row up by about one |
| 25 to 34 | 26 to 35 | Most users; everyday age is a fair approximation |
| 35 to 45 | 36 to 46 | Older mothers, near the upper edge of the chart |
| Any age around Lunar New Year | Off by one depending on date | Edge cases where the new lunar year turns during pregnancy |
Worked example: if you were 27 at conception, your everyday age is 27, and Chinese lunar age at conception is roughly 28 (27 + 1). Enter 27 in the tool for a fast approximate read, or 28 if you have already added a year for the original chart. For the month, the lunar month of conception usually sits within the same Gregorian month or shifts by one, so picking the calendar month you conceived is close enough for a fun guess.
Why the Chart Has No Scientific Basis
A baby's sex is decided at the moment of conception by the father's sperm. A sperm carrying a Y chromosome pairs with the mother's X chromosome and produces a boy; a sperm carrying an X chromosome pairs with the mother's X chromosome and produces a girl. The odds are close to 50/50 for every pregnancy, with slightly more boys born worldwide, and nothing about the mother's age or the month of conception changes that underlying biology.
Controlled reviews of the Chinese gender calendar, including a 2010 analysis of hundreds of births, found the chart no more accurate than a coin flip. The chart cannot see, measure, or influence a real pregnancy, because the sex of the baby is locked in at fertilization. Any match between the chart's prediction and the baby's actual sex is coincidence, not causation, and the roughly 50% background rate means about half of all guesses will look "right" by chance alone.
For a real answer, an ultrasound scan around 18 to 20 weeks or non-invasive prenatal testing is the only reliable route. Use the chart the way it has been used for generations: as a playful ritual, a party prop, or a curious conversation starter, and keep the serious planning for medical advice from your doctor or midwife.
Fun Ways to Try the Chinese Gender Calendar
Because the result is meant as entertainment, the chart works best in social settings. Try it at a gender-reveal party by having both parents enter their ages and the conception month without revealing the result, then compare predictions before opening the envelope. At a baby shower, print a few copies of the chart and let guests take turns reading boy or girl for the parents-to-be.
You can also layer the chart against other old wives' tales to see how they line up: the baking soda test, the ring-on-a-string swing, the wedding-ring pendulum, the cabbage juice color change, and the mother's food cravings. None of these are reliable, but together they make a fun guessing game. Screenshot your prediction from the tool, share it with friends, and enjoy the suspense for what it is: a centuries-old bit of folklore, not a forecast.