How does the Baby Gender Predictor work?

We use the Chinese gender chart — a folk tradition that pairs the mother’s lunar age at conception with the month of conception to predict a boy or girl. We estimate lunar age as your age + 1 and use the ordinary calendar month, like most online versions (the original uses the Chinese lunar month). It’s a 50/50 guess in practice; treat it as fun, not as a medical answer.

When can I find out my baby’s actual sex?

Non-invasive prenatal testing (NIPT) can show fetal sex with about 99% accuracy from around 10 weeks of pregnancy via a maternal blood sample. The 18–22 week anatomy ultrasound also reveals sex with high accuracy when the baby is in a cooperative position.

Old wives’ tales — any of them actually work?

No. Carrying high or low, food cravings, the ring-over-bump test, the Mayan calendar, the baking-soda urine test, the heart-rate myth — none of these has good evidence behind it. The ones that have been studied, like bump shape and the heart-rate myth, did no better than chance. They’re fun guesses.

Can the Chinese chart predict twins?

No. The chart only predicts one gender outcome per conception event. For twins, ultrasound is the usual way to see each baby’s sex. A standard NIPT blood test can show whether a Y chromosome is present, but it can’t tell which twin is a boy or whether both are.

Does the chart account for IVF or fertility treatment?

No. The Chinese chart is folklore based on lunar age and month — it makes no distinction between natural conception, IVF, or any other method. If your provider has performed pre-implantation genetic testing (PGT), they may already know the embryo’s sex.

Baby Gender Predictor

Boy or girl? The Chinese gender chart is one of the best-known folklore guesses. It’s about as accurate as a coin toss, so it’s just for fun — great for baby showers, party games, and reveal videos. Enter mother’s age and conception month below.

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.

Boy or girl: what folklore says

Old wives’ tales have been guessing baby gender for centuries. The Chinese gender chart is the most enduring of them: a grid that pairs maternal lunar age with the lunar month of conception. Other folk methods include carrying-high vs carrying-low, ring-over-bump pendulum tests, food cravings, the Mayan calendar, and the heart-rate myth.

The honest answer about all of them: they’re about 50% accurate. Which is why they’re so popular — they make for a fun group game where everyone gets to guess and someone is inevitably right.

When you want a real answer

NIPT blood test from ~10 weeks — about 99% accurate for sex in studies. Often the earliest reliable answer.
Anatomy ultrasound at 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.
Pre-implantation genetic testing (PGT) — used in some IVF cycles. Sex is known before transfer.

Speak with your healthcare provider about what makes sense for your pregnancy. Some providers will tell you the sex at the anatomy scan; others wait until you ask.

Frequently asked questions

How does the Baby Gender Predictor work?: We use the Chinese gender chart — a folk tradition that pairs the mother’s lunar age at conception with the month of conception to predict a boy or girl. We estimate lunar age as your age + 1 and use the ordinary calendar month, like most online versions (the original uses the Chinese lunar month). It’s a 50/50 guess in practice; treat it as fun, not as a medical answer.
When can I find out my baby’s actual sex?: Non-invasive prenatal testing (NIPT) can show fetal sex with about 99% accuracy from around 10 weeks of pregnancy via a maternal blood sample. The 18–22 week anatomy ultrasound also reveals sex with high accuracy when the baby is in a cooperative position.
Old wives’ tales — any of them actually work?: No. Carrying high or low, food cravings, the ring-over-bump test, the Mayan calendar, the baking-soda urine test, the heart-rate myth — none of these has good evidence behind it. The ones that have been studied, like bump shape and the heart-rate myth, did no better than chance. They’re fun guesses.
Can the Chinese chart predict twins?: No. The chart only predicts one gender outcome per conception event. For twins, ultrasound is the usual way to see each baby’s sex. A standard NIPT blood test can show whether a Y chromosome is present, but it can’t tell which twin is a boy or whether both are.
Does the chart account for IVF or fertility treatment?: No. The Chinese chart is folklore based on lunar age and month — it makes no distinction between natural conception, IVF, or any other method. If your provider has performed pre-implantation genetic testing (PGT), they may already know the embryo’s sex.

Related tools

Gender Predictor — the same chart with more background
Pregnancy Due Date Calculator — find your due date

Sources

Checked against the following public guidance on September 26, 2026. Advice can differ between countries; your doctor, nurse or midwife can apply it to you.

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