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). For the month, we use the ordinary calendar month you conceived, like most online versions of the chart. We don’t convert it to a true Chinese lunar month, so a chart that does may give a different answer.

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 can be done from about 10 weeks of pregnancy. In studies they get the sex right about 99% of the time. At the anatomy scan (18–22 weeks), the sex can often be seen if the baby is in a good position, and studies find these calls are right about 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.

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.

Mother’s age at conception

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

Month of conception

Chinese chart prediction

It’s a girl!

Based on lunar age 29 and a conception month of June.

We read the chart using the ordinary calendar month, the way the widely shared versions of it do — we don’t convert your date to a true Chinese lunar month, so a chart that does may land on a different answer.

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. Our version, like most online ones, reads the month column from the ordinary calendar month.

There is no science behind it. A large study checked it against more than 2.8 million births in Sweden and found it was no better than a coin flip — right about half the time. People love it anyway because it’s a fun pre-ultrasound guessing game.

How accurate are real gender tests?

Non-invasive prenatal testing (NIPT): about 99% accurate for sex in studies, from about 10 weeks. Detects fetal DNA in mother’s blood.
Anatomy ultrasound (18–22 weeks): usually right (about 99% in studies) when the baby’s position gives a clear view. Sometimes the sex can’t be seen.
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). For the month, we use the ordinary calendar month you conceived, like most online versions of the chart. We don’t convert it to a true Chinese lunar month, so a chart that does may give a different answer.
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 can be done from about 10 weeks of pregnancy. In studies they get the sex right about 99% of the time. At the anatomy scan (18–22 weeks), the sex can often be seen if the baby is in a good position, and studies find these calls are right about 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.)

Related tools

Baby Gender Predictor — same chart, simpler view focused on the baby
Pregnancy Due Date Calculator — when is the baby actually due
Period Calculator — track your cycle

Sources

Checked against the following public guidance on October 2, 2026. Advice can differ between countries; your doctor, nurse or midwife can apply it to you.

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