Chinese and Mayan gender calendars: boy or girl?
Enter the mother’s birth date and a conception date to compare two predictions for fun. See how each calculation works and understand its limits.
Chinese gender calendar 2026
This calculator is a game and cannot tell you a baby’s sex. The two methods may disagree; neither result represents a measured probability.
Chinese baby gender prediction
Mayan baby gender prediction
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FAQ - Chinese Gender Calendar
How is the Chinese result calculated?
Both dates are converted to Chinese lunar dates. Nominal age is the difference between the lunar years plus one, increasing at Lunar New Year. That age and the conception month select a cell in the site’s chart. Its historical origin is undocumented, and it supplies no validated probabilities.
Which rule does the Mayan calculation use?
This version adds the mother’s completed age to the Haab period number, then checks whether the sum is even or odd. The Haab has 18 periods of 20 days, followed by five days called Wayeb or Uayeb, treated here as period 19. The calendar’s existence does not establish a historical origin for this prediction rule.
Can these results tell me my baby’s sex?
No. These are entertainment results. Converting calendar dates correctly does not make these rules reliable predictors of a child’s sex. If the Chinese and Mayan answers differ, neither is presented as more likely.
Which dates and ages are supported?
Both dates must fall between 1900 and 2050, with conception after the mother’s birth. The Chinese chart covers nominal ages 18 to 43; the Mayan game uses completed ages 16 to 50. These are tool limits, not pregnancy recommendations.
What happens when I change a date?
Previous results are cleared so they cannot be mistaken for a new calculation. Choose your dates and run the game again. The dates are processed in your browser and are not added to the sharing link.
Method, reliability and sources
A study of 2,840,755 births found that the Chinese calendar method performed no better than chance. It does not validate this site’s chart or its Mayan rule.
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