Just for fun. The Chinese gender calendar is a centuries-old folk chart with no scientific basis. It cannot determine or predict your baby's sex. For a real answer, ask your healthcare provider about an anatomy ultrasound or genetic testing. This tool stores nothing.
Enter the mother's age at conception and the month of conception to see what the old chart says.
What is the Chinese gender calendar?
The Chinese gender calendar — sometimes called the Chinese gender chart or Chinese birth chart — is a traditional folk table said to predict a baby's sex based on the mother's lunar age at conception and the lunar month of conception. Its origins are often attributed to ancient China, though the historical record is uncertain. It has been used as a cultural curiosity for generations.
Is the Chinese gender calendar accurate?
No. Scientific studies have repeatedly found that the Chinese gender calendar predicts a baby's sex no better than random chance — approximately 50%, the same as flipping a coin. It is a fun piece of cultural folklore, not a medical tool. If you want to know your baby's biological sex, speak to your healthcare provider about an anatomy ultrasound (typically at 18–20 weeks) or genetic testing such as NIPT.
How this tool works
Enter the mother's age at conception and the month of conception. The tool looks up the standard published Chinese gender chart (lunar age 18–45, months 1–12) and returns the folk prediction. No data is stored or transmitted — everything runs in your browser.
Track your pregnancy week by week in OptiAI
OptiAI lets you track your pregnancy week by week — logging symptoms, appointments, weight, ultrasound measurements, and milestones — alongside the rest of your family's health and home. Start for free and keep everything in one place.
Disclaimer
This is a novelty tool for entertainment only. It is based on folklore and a traditional folk chart, not science, and cannot determine or predict your baby's sex. It is not medical advice and stores nothing you enter. For an accurate determination, speak to your healthcare provider about an anatomy ultrasound or genetic testing.