Chinese Gender Predictor Calculator
Predict baby gender using the traditional Chinese gender prediction chart. Enter values for instant results with step-by-step formulas.
Reviewed by Daniel Agrici, Founder & Lead Developer
Formula
Chinese Gender Chart[Lunar Age][Lunar Month] = Boy or Girl
The traditional Chinese Gender Chart uses a grid with the mother lunar age (Gregorian age + 1) on one axis and the lunar month of conception on the other. Each cell contains a prediction of either Boy or Girl. The chart covers maternal ages 18-45 and all 12 months.
Worked Examples
Example 1: Standard Prediction Example
Problem:A 28-year-old woman (Gregorian age) conceived in March. What does the Chinese chart predict?
Solution:Gregorian age: 28\nLunar age: 28 + 1 = 29\nConception month: March (Month 3)\nLooking up the chart at lunar age 29, month 3: the chart shows 0 (Girl)\nThe prediction is based on the traditional chart grid values.
Result:Prediction: Girl (for lunar age 29, conception month March)
Example 2: Planning Conception Month
Problem:A 25-year-old woman wants to know which months predict a boy according to the chart.
Solution:Gregorian age: 25, Lunar age: 26\nChart row for lunar age 26:\nJan: Boy, Feb: Boy, Mar: Boy, Apr: Boy, May: Girl, Jun: Girl\nJul: Boy, Aug: Girl, Sep: Girl, Oct: Boy, Nov: Girl, Dec: Girl\nBoy months: January, February, March, April, July, October (6 months)\nGirl months: May, June, August, September, November, December (6 months)
Result:Boy prediction months: Jan, Feb, Mar, Apr, Jul, Oct (6 of 12 months)
Frequently Asked Questions
What is the Chinese Gender Prediction Chart and where did it originate?
The Chinese Gender Prediction Chart is an ancient method of predicting a baby gender based on the mother lunar age at conception and the lunar month of conception. Legend claims it was discovered in a royal tomb near Beijing over 700 years ago during the Qing Dynasty, though some accounts place its origin even earlier. The chart was allegedly kept in the Institute of Science in Beijing and later brought to other countries. It uses the traditional Chinese lunar calendar system rather than the Western Gregorian calendar, which is why lunar age calculations add approximately one year to the Western age. The chart remains extremely popular in Chinese culture and has become widely used worldwide.
How accurate is the Chinese Gender Prediction Chart?
Scientific studies have consistently found that the Chinese Gender Prediction Chart has an accuracy rate of approximately 50 percent, which is essentially the same as random chance or flipping a coin. A 2009 study published in the American Journal of Obstetrics and Gynecology analyzed over 2.8 million births and found no significant predictive ability. Another study from Sweden examining over 3 million births reached the same conclusion. Despite these findings, the chart remains popular as a fun cultural tradition and conversation starter during pregnancy. Many families enjoy using it alongside other old wives tales about gender prediction, understanding that it is entertainment rather than science.
How do you calculate the lunar age for the Chinese chart?
In the Chinese calendar system, a person is considered one year old at birth because the time spent in the womb counts as the first year of life. This means lunar age is typically calculated by adding one year to the Western or Gregorian age. However, the precise calculation is more complex because the Chinese New Year falls on a different date each year, usually between January 21 and February 20. A person born before the Chinese New Year in a given year would add two years to their birth year calculation. For simplicity, most online versions of the chart approximate lunar age by adding one year to the Western age, which is reasonably accurate for most people.
Can the Chinese chart be used to plan the gender of a baby?
Some couples use the Chinese Gender Chart to try to time conception for a specific gender prediction, choosing months when the chart suggests their preferred outcome. However, since scientific evidence shows the chart is no more accurate than chance, using it for gender planning is unreliable. The biological determination of sex depends on whether the fertilizing sperm carries an X or Y chromosome, a factor completely independent of the mother age or the month of conception. For couples who seriously want to influence the sex of their child, medical options like preimplantation genetic testing with IVF offer much higher accuracy rates. The chart is best enjoyed as a fun tradition rather than a planning tool.
References
Reviewed by Daniel Agrici, Founder & Lead Developer · Editorial policy