The Chinese Gender Prediction Chart: Ancient Wisdom or Elaborate Coincidence?

Imperial Origins (or Very Good Marketing?)

The story told about the Chinese Gender Prediction Chart is that it was discovered in a royal tomb near Beijing over 700 years ago during the Qing Dynasty, originally used by the Imperial family to maximise the chance of producing male heirs. A reproduction supposedly hangs in the Institute of Science in Beijing.

Historians are somewhat sceptical of this precise origin story—no verified documentation traces the chart to a specific royal tomb—but the chart itself has been used across China and surrounding regions for generations and remains one of the most-used "fun" gender prediction methods globally.

How the Chart Works

The Chinese Gender Prediction Chart is a grid that cross-references two values:

1. The mother's lunar age at the time of conception (which is typically your Western age + 1 year, since the Chinese calendar counts gestation in the age calculation)
2. The lunar month of conception (which differs from the Western calendar month by approximately 3–7 weeks depending on the year)

Each cell in the resulting grid is marked either M (male) or F (female). The chart covers maternal ages from 18 to 45 and all 12 lunar months.

An important note: many online versions of this chart are inaccurate, using Western age and Western calendar months directly rather than converting to lunar equivalents. This is why results can vary wildly between different websites. Our Chinese Gender Predictor applies the correct lunar calendar conversion.

What Does the Science Say?

This is where we have to be honest: multiple rigorous studies have tested the chart against actual birth data and found accuracy rates indistinguishable from random chance—hovering at approximately 50%. The most comprehensive study, published in Paediatric and Perinatal Epidemiology in 2010 by Dr. Kalinda Whitfield and colleagues at the University of British Columbia, analysed 2,834 births and found the chart provided no predictive value beyond what would be expected by chance alone.

A 2012 follow-up study using data from 10,000 Canadian births reached the same conclusion.

So why do so many people report that it "worked for them"? Because it has a 50% base rate of success, and humans are wired to remember the hits and forget the misses—a cognitive bias called confirmation bias. If someone flipped a coin for every birth in their family and told you the results, you'd expect about half to be right.

Why Use It Then?

Because it's fun. Gender prediction games aren't really about accuracy—they're about the shared experience of anticipation, about gathering family around the idea of this new person and participating in a ritual that connects this pregnancy to centuries of human curiosity before it. The chart gives you a definitive "answer," creates a moment of drama when you reveal it, and gives you an excuse to debate vigorously with your mother-in-law about whether the lunar calendar was correctly applied.

At FirstGlimpse, we offer the Chinese Gender Predictor alongside the Ramzi Theory, the Nub Theory, and the Mayan Calendar as part of our suite of gender prediction tools—clearly labelled as entertainment. They're companions to the real milestone events of pregnancy, not replacements for clinical testing.

Want a More Visual Peek?

If you want to go beyond prediction and actually see a photorealistic image of what your baby might look like, our AI Baby Portrait Generator uses your ultrasound scan to render a detailed, personalised portrait. It won't tell you the gender, but it'll show you a face—and that's something no 700-year-old chart can do.

All gender prediction tools on this site are for entertainment only. Medically reliable sex determination methods include NIPT blood tests (from 10 weeks) and the 20-week anatomy scan.