Lunar Age Calculator
Your lunar age is calculated using the moon's cycle instead of the solar calendar. Since a lunar month is about 29.5 days (shorter than a solar month), you've lived through more lunar months than calendar months. This concept is important in Chinese, Korean, Vietnamese, and many other East Asian cultural traditions.
The lunar calendar is based on the moon's orbit around Earth:
- 1 lunar month = 29.530588853 days (one full moon cycle)
- 1 lunar year = 12 lunar months = ~354.37 days
- 1 solar year = 365.25 days
Because a lunar year is about 11 days shorter than a solar year, your lunar age is always slightly higher than your solar (calendar) age. After about 33 solar years, you've accumulated roughly one extra lunar year.
Lunar Age in Different Traditions
- Chinese tradition: You're considered 1 year old at birth (counting time in the womb), and everyone ages up by one year at Chinese New Year, not their birthday
- Korean tradition: Similar to Chinese, you're 1 at birth and age up on January 1st (though Korea officially adopted international age counting in 2023)
- Vietnamese tradition: Uses lunar age for cultural events, festivals, and determining auspicious dates
This calculator shows your pure lunar age based on the synodic month cycle. The East Asian traditional age counting described above follows different conventions and would typically add 1-2 years.