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Baby Gender Predictor
Try this free baby gender predictor for a bit of fun with two old folklore methods: the traditional Chinese gender calendar and the Mayan method. Enter the mother's age at conception and the month of conception, and see what each tradition would have predicted.
A prediction here is a coin toss dressed up as a chart — about a 50% chance either way, whichever method you pick.
How it works
This calculator runs two traditional prediction methods from the same three inputs: the mother's age at conception, the month of conception, and the year of conception. You can highlight one method or show both side by side. The inputs are simple on purpose, because the methods themselves are simple folk rules, not measurements of anything in the body.
The Chinese gender calendar is the better known of the two. It uses the mother's lunar age at conception and the month of conception. Lunar age is a traditional way of counting age in which a person is considered one year old at birth, so the simplified version used here adds one year to the mother's age. Then the rule looks at whether the two numbers are even or odd: if the lunar age and the conception month have the same parity, both even or both odd, the chart predicts a girl. If they differ, one even and one odd, it predicts a boy.
The Mayan method uses the mother's age at conception and the year of conception instead of the month. Add the two numbers together in spirit — the rule is really about whether they match: if both are even, or both are odd, the folklore says girl. If one is even and the other is odd, it says boy. Because the two methods use different numbers, they often disagree, and the calculator shows both so that disagreement is visible rather than hidden.
Neither rule has any scientific basis. A baby's sex is decided at conception by biology, not by the calendar, and no chart can read it from a mother's age or a month. That is why every result on this page comes with the same warning: it is a guessing game with roughly a fifty-fifty chance, and it should never guide a medical decision, a purchase, or a plan.
Worked example
Emma is 28 years old when she conceives in June 2026. She enters age 28, month June, and year 2026, and highlights the Chinese gender calendar.
Step 1: Work out the lunar age. 28 + 1 = 29, which is an odd number.
Step 2: Note the conception month. June is month 6, which is an even number.
Step 3: Compare the parity. Lunar age 29 is odd and month 6 is even, so they are different. The Chinese rule says different parity means a boy.
Step 4: Check the Mayan method for comparison. Age 28 is even and year 2026 is even, so they match, and the Mayan rule says girl.
The tool shows the same result: Boy — Chinese calendar, with lunar age 29 (odd) and June (even) having different parity. The breakdown also shows the Mayan prediction of Girl, so Emma can see at a glance that the two traditions disagree — exactly what you would expect from two guessing games.
FAQ
Can a baby gender predictor really tell if my baby is a boy or a girl?
No. No calendar, chart, or folklore method can determine a baby's sex. This tool is for entertainment only. Only a medical scan or test carried out by a qualified professional can give reliable information, and even then it is shared at the right stage of pregnancy and under local rules.
How does the Chinese gender calendar work?
The traditional Chinese gender calendar uses the mother's lunar age at conception and the month of conception. In this simplified version, lunar age is the mother's age plus one year. When the lunar age and the conception month have the same parity, both even or both odd, the chart predicts a girl; when they differ, it predicts a boy.
What is the Mayan gender prediction method?
The Mayan method adds the mother's age at conception to the year of conception. If both numbers are even, or both are odd, the folklore says girl; if one is even and the other is odd, it says boy. Like the Chinese calendar, it is a folk tradition with no scientific basis, so treat the answer as a bit of fun.
What if the Chinese and Mayan methods disagree?
Disagreement is normal, because the two methods use different numbers and neither is based on biology. This calculator shows both results side by side so you can see the difference. Neither answer is more reliable than the other, and a disagreement is a good reminder that the predictions are for entertainment only.
What is lunar age, and why does the calculator add one year?
Lunar age comes from the traditional Chinese way of counting age, in which a baby is considered one year old at birth and gains a year at the lunar new year. The simplified version used here adds one year to the mother's age at conception. It is a folk convention, not a medical measurement, and different versions of the chart count it slightly differently.