A fun, traditional Chinese lunar-calendar gender chart — for entertainment and family tradition only. This is folklore, not science, and carries no medical or genetic predictive value.
No. The traditional Chinese gender chart has never been scientifically validated. Because a baby's sex is essentially a 50/50 outcome, this chart — like flipping a coin — will be "right" about half the time purely by chance. It's a centuries-old piece of folklore that many families enjoy for fun, not a prediction method with any real accuracy.
🎎 Entertainment Notice: This calculator recreates a traditional Chinese folklore chart for fun. It is not a medical, scientific, or genetic prediction tool. Results are essentially a coin-flip — roughly a 50/50 chance of matching the actual outcome. Please do not rely on this for any real-life decision.
Uses Gregorian (Western) dates. We approximate the traditional lunar age and lunar month automatically — see below for how.
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⚠️ Roughly 50/50 by chance. This is a traditional chart for fun — not a scientific or medical prediction.
The traditional chart uses two lunar-calendar inputs rather than the everyday Western calendar: the mother's "lunar age" at conception and the lunar month of conception. Converting exactly between the Gregorian and Chinese lunar calendars requires a year-by-year lookup table (because lunar new year falls on a different Gregorian date each year), which is beyond what a simple calculator can do precisely. This tool uses a commonly used simplification instead:
The classic chart is a grid of lunar ages (usually 18 to 45) down one side and lunar months (1 to 12) across the top, with each cell marked Boy or Girl. Because there is no single verified "official" version of every cell — the chart has been hand-copied and reprinted countless times over centuries — this calculator uses a reasonable traditional-style alternating pattern across the full 18–45 age range and all 12 lunar months. Here's a small sample so you can see the general alternating style:
| Lunar Age | Mth 1 | Mth 2 | Mth 3 | Mth 4 | Mth 5 | Mth 6 | Mth 7 | Mth 8 | Mth 9 | Mth 10 | Mth 11 | Mth 12 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 20 | Boy | Girl | Girl | Boy | Girl | Girl | Boy | Girl | Girl | Boy | Girl | Girl |
| 21 | Girl | Boy | Boy | Girl | Boy | Boy | Girl | Boy | Boy | Girl | Boy | Boy |
| 22 | Boy | Girl | Girl | Boy | Girl | Girl | Boy | Girl | Girl | Boy | Girl | Girl |
| 23 | Girl | Boy | Boy | Girl | Boy | Boy | Girl | Boy | Boy | Girl | Boy | Boy |
This is a small illustrative sample only. The calculator above checks the full 18–45 × 1–12 grid automatically. Remember: whichever cell comes up, it's right roughly half the time purely by chance.
The Chinese gender predictor chart is a piece of folk tradition that is often said to date back hundreds of years to the Qing Dynasty, and it is popularly linked to concepts from Chinese astrology and the I Ching, such as yin-yang balance and the interplay of the five elements. Exactly who created it, or when the specific grid of ages and months in circulation today first appeared, isn't something that can be traced to a single verified historical document — like many folk charts, it has been copied, retold and reprinted so many times over the generations that it now exists in slightly different versions across different books and websites. What has stayed constant is the basic idea: a table crossing the mother's age against the lunar month of conception, with each combination assigned to either "boy" or "girl".
The chart relies on two lunar-calendar concepts that often confuse people unfamiliar with them. The first is lunar age (sometimes called Chinese age or "sui"), a traditional way of counting age that starts a person at one year old at birth — rather than zero, as in the West — and then adds a year at each Lunar New Year rather than on the individual's birthday. Because of this, a lunar age is typically one to two years higher than someone's Western/Gregorian age, and the exact gap depends on how close their birthday falls to Lunar New Year. The second concept is the lunar month, which is a month in the traditional Chinese lunisolar calendar. Lunar months don't line up neatly with Gregorian months — the Chinese calendar adds an extra leap month every few years to stay roughly in sync with the seasons, and Lunar New Year itself lands on a different Gregorian date each year (typically late January to mid-February). This means the "true" lunar month of any given date can only be found by checking a proper lunar calendar conversion table for that specific year.
Because building a full year-by-year lunar conversion table is beyond the scope of a simple web calculator, this tool uses a widely used shortcut: it estimates lunar age as the mother's Western age at conception plus one, and estimates the lunar month as roughly one month ahead of the Gregorian conception month. Many casual gender-predictor tools online use a similar simplification. It gets you into the right general neighbourhood of the traditional chart, but it is not the same as a precise conversion — and given that the chart has no scientific basis regardless, the small margin of error in the approximation doesn't change what the result actually means: a bit of fun, not a forecast.
Speak with your doctor or midwife about which, if any, of these are appropriate and available for your pregnancy — this calculator plays no role in that decision.
What is the Chinese gender predictor chart?
It's a traditional folk chart, popularly said to date back to the Qing Dynasty, that pairs the mother's lunar age at conception with the lunar month of conception to produce a "Boy" or "Girl" result. It's a long-standing piece of Chinese folklore and family tradition, not a scientific or medical tool.
Is the Chinese gender chart scientifically accurate?
No. There is no scientific study validating this chart, and there's no biological mechanism by which a mother's age and the lunar month of conception could determine a baby's sex, which is set by chromosomes at conception. Because the outcome is essentially binary, the chart tends to be "right" roughly half the time — about what you'd expect from random chance alone.
What is "lunar age" and why is it different from my real age?
Lunar age (sometimes called Chinese age) is a traditional counting method where a baby is considered 1 year old at birth, and everyone's age then increases by one at each Lunar New Year, rather than on their individual birthday. As a result, your lunar age is usually one to two years higher than your Western/Gregorian age, with the exact difference depending on how close your birthday is to Lunar New Year.
How is the lunar month different from the calendar month?
The Chinese lunar calendar is based on the cycles of the moon and doesn't align exactly with the Gregorian (Western) calendar. Lunar New Year falls on a different Gregorian date each year, and an extra leap month is periodically inserted to keep the lunar calendar roughly in step with the seasons. This means a given Gregorian date doesn't always correspond to the same lunar month from year to year — an exact conversion requires checking a lunar calendar table for that specific year.
Does this calculator use the exact traditional lunar calendar?
No — it uses a simplified approximation (Western age at conception + 1 for lunar age, and roughly one month ahead of the Gregorian month for lunar month), which is a commonly used shortcut since a precise conversion needs a full lunar calendar lookup table. Given that the chart itself has no scientific basis, this approximation doesn't meaningfully change what the result means — it's for fun either way.
What are the actual medically accurate ways to find out my baby's sex?
A mid-pregnancy ultrasound (typically around 18–20 weeks) is the most common method. Non-invasive prenatal testing (NIPT), a blood test available from around 10 weeks, can also indicate sex chromosomes. Diagnostic procedures like chorionic villus sampling (CVS, roughly 10–13 weeks) and amniocentesis (from around 15 weeks) can determine sex too, though they're generally used for specific medical reasons rather than routine sex determination. This calculator is not a substitute for any of these — it's just for fun.
How old is this tradition?
The chart is popularly said to be centuries old and is often linked to the Qing Dynasty and to Chinese astrology and I Ching concepts, though — like many folk traditions — its precise origins aren't documented in a single verifiable source. Versions of the chart have circulated for generations and are reprinted, with minor variations, across many books and websites today.
Should I use this to make any real decisions, like buying clothes or choosing a name?
No. Because the result is roughly a coin flip, using it to guide real purchases or plans means you'd effectively be guessing. Treat any prediction from this calculator as a fun talking point, not information to act on — wait for a medically confirmed result if you want certainty.
Why do people still enjoy using charts like this?
It's a lighthearted, low-stakes family tradition — many expecting parents, grandparents and friends enjoy comparing predictions from the chart, gender reveal games, and old wives' tales as part of the fun of pregnancy. It's harmless as long as it's treated as entertainment rather than a real forecast.
Can this calculator be wrong?
Yes, roughly half the time, by definition. Since a baby's sex is close to a 50/50 outcome and this chart has no proven predictive power, it will inevitably be "wrong" about as often as it's "right" across many uses — exactly what you'd expect from chance alone.