period tools

Gender Predictor

The classic Chinese gender chart — a fun folklore guess based on mother’s lunar age and the month of conception. Strictly for entertainment, not a medical tool.

Western age, in whole years. We add 1 to estimate Chinese lunar age.

Chinese chart prediction

It’s a girl!

Based on lunar age 29, lunar month 6.

For entertainment only. The Chinese gender chart is a folklore tradition, not a medical or scientific tool. For an accurate prediction, your healthcare provider can offer ultrasound or non-invasive prenatal testing.

What is the Chinese gender chart?

The Chinese gender chart (sometimes called the Chinese gender calendar or Chinese baby calendar) is a folklore tradition said to come from a Qing dynasty royal tomb. It pairs the mother’s lunar age at conception with the lunar month of conception and predicts a boy or a girl.

There is no science behind it. Multiple studies have looked at how often the chart matches real outcomes, and it lands at roughly 50% accuracy — the same as a coin flip. People love it anyway because it’s a fun pre-ultrasound guessing game.

How accurate are real gender tests?

  • Non-invasive prenatal testing (NIPT): >99% accuracy from about 10 weeks. Detects fetal DNA in mother’s blood.
  • Anatomy ultrasound (18–22 weeks): 95–99% accurate when performed by an experienced sonographer.
  • Chinese gender chart: ~50% — same as flipping a coin.
  • Ring-over-bump, Mayan calendar, baking soda urine test: all folklore. No reliable evidence.

Frequently asked questions

How does the Gender Predictor work?
It uses the Chinese gender chart, a folklore tradition based on the mother’s lunar age at conception and the lunar month of conception. The chart pairs each combination with a predicted boy or girl. We convert Western age to lunar age by adding one year (the Chinese tradition counts time in the womb as the first year).
Is the Chinese gender chart accurate?
It’s a folk tradition with no scientific basis. The chart has only a 50% chance of being correct by random luck — about the same as flipping a coin. Use it as a fun keepsake or party guess, not as a medical prediction.
How accurate are actual scientific gender tests?
Modern non-invasive prenatal tests (NIPT) screen fetal DNA from maternal blood and reach >99% accuracy from about 10 weeks of pregnancy. Anatomy ultrasounds between 18–22 weeks identify gender about 95–99% of the time. Both are far more reliable than any folklore chart.
What is ‘lunar age’?
In Chinese tradition, a baby is considered 1 year old at birth (counting the time in the womb), and gains a year at each Chinese New Year. For simplicity, our tool approximates lunar age as Western age + 1, which matches the most widely shared version of the chart.
Can I use this before conception to choose a gender?
No. There’s no scientifically validated method to choose your baby’s gender at conception using folklore charts. The Chinese chart is a fun look-back tool, not a planning device. Methods that claim to do this — diet, timing, position — have no reliable evidence behind them.

How accurate is the chart, really?

See our deep dive: Chinese Gender Predictor: How Accurate Is It Really? (Short answer: about 50% — the same as a coin flip.)

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