Chinese Gender Predictor

Mother's date of birth

Date of conception (or first day of your last period if unsure)

This is a traditional Chinese lunar calendar folklore method, believed to be centuries old — it's meant for fun and is not scientifically validated. The real chance of having a boy or girl is essentially 50/50, and only a medical ultrasound or genetic test can reliably confirm your baby's sex.

How this is calculated

This tool follows the traditional format of the "Chinese gender chart": it looks up your lunar age at conception (age in the Chinese lunar calendar, which counts a year older at each Lunar New Year, roughly one Gregorian month offset from the Western calendar) against the lunar month of conception, and reads off a boy or girl guess — the same idea as the printed charts long said to be based on an artifact from the Qing dynasty.

This is a folklore method with no scientific basis, not a medical or statistical prediction. It's included purely for fun, the way many expecting families enjoy trying it alongside old wives' tales about cravings, heart rate, or the shape of the belly.

Things to know

A baby's biological sex is determined at the moment of conception by which type of chromosome (X or Y) the sperm carries — it isn't influenced by the lunar calendar, the mother's age, or the conception month. Because of that, the real odds of a boy or a girl are close to 50/50 regardless of what any chart says.

You may see slightly different results from other Chinese gender predictor charts or apps online — there are several versions in circulation with small variations in their lookup tables, and none of them has been shown to predict better than chance in studies that have examined the method. Treat this purely as a lighthearted guessing game, not a substitute for an ultrasound or genetic test if you want to actually know your baby's sex.

If your conception date is uncertain, entering the first day of your last period instead (as the field above suggests) is the traditional workaround, since it shifts the estimated conception window back by roughly two weeks. Either way, changing the input date by even a few days can flip the chart's answer, which is another sign the method isn't measuring anything biologically meaningful — it's simply a lookup table.

Why people still try it

Guessing games like this one are a long-standing, low-stakes part of pregnancy culture in many places, often enjoyed alongside other folk predictors — carrying "high" versus "low," cravings for sweet versus salty food, or the baby's heart rate on a monitor. None of these have held up to scientific testing as real predictors, but that's generally not the point: they're a fun way to speculate and share excitement while waiting for a definitive answer.

If you do want a reliable answer before birth, an ultrasound (commonly around the 18–22 week anatomy scan) or a genetic test like NIPT can identify biological sex with high accuracy — your OB or midwife can tell you more about the options and timing available to you.