Lunar age tool
Chinese Lunar Age Calculator
Calculate traditional Chinese lunar age for a date of birth and a reference date.
Calculate Chinese lunar age
What Is Chinese Lunar Age?
Chinese lunar age is a traditional nominal age used in some cultural customs. Instead of counting only completed birthdays, the method starts at one and follows the lunar-year system. That can make the result one or two years higher than Western age in everyday use.
How Is It Different From Western Age?
Western age is based on the anniversary of a Gregorian birth date. Traditional Chinese lunar age depends on the lunar birth year and the lunar year of the reference date. Because Chinese New Year moves each Gregorian year, the difference is not always the same for everyone.
Why the Gender Chart Uses Lunar Age
The traditional Chinese Gender Calendar was built around lunar calendar values. It pairs the mother's lunar age at conception with the lunar month of conception. Using Western age directly can place a person on the wrong chart row.