Age in Chinese Lunar Calendar

Enter your birth date to see your age in the Chinese Lunar Calendar.

Your Date of Birth (Gregorian) (DD-MM-YYYY)

Lunisolar Calendar (Yin-Yang & 24 Solar Terms) 2697 BCE (Yellow Emperor / Huangdi Era)

About the Chinese Lunar Calendar.

The Chinese lunar calendar dates from 2697 BCE. Your age in lunar years is calculated by adding 2697 to your birth year and accounting for the lunar new year.

Astronomical & Mathematical Structure

Astronomical Framework & Solar Term Intercalation

The traditional Chinese calendar (often termed the lunar calendar or Yin-Yang calendar) is a sophisticated astronomical lunisolar system. Its historical epoch is traditionally reckoned from 2697 BCE, the legendary ascension of the Yellow Emperor (Huangdi), though the continuous 60-year sexagenary stem-branch cycle was formally standardized in 2637 BCE. Months are strictly synodic, beginning precisely on the day of the astronomical new moon (dark moon conjunction), calculated for the 120° East meridian (Beijing standard time). Because 12 lunar months average roughly 354 days—falling about 11 days short of the 365.242-day solar year—the calendar intercalates leap months (Runyue) roughly 7 times every 19 years. The calendar divides the tropical year into 24 Solar Terms (Jieqi); whenever a lunar month lacks a major solar term (Zhongqi), it is designated as a leap month.

Cultural, Religious & Historical Context

Cultural Heritage, Seasonal Festivals & East Asian Tradition

With roots stretching back over three millennia to the Shang and Zhou dynasties and officially calculated today by the Purple Mountain Observatory in Nanjing, the calendar coordinates agricultural, seasonal, and cultural life across East Asia and the worldwide diaspora. It determines the timing of major traditional holidays, including the Spring Festival (Chinese New Year / Lunar New Year), the Lantern Festival, the Dragon Boat Festival, and the Mid-Autumn Festival. It is equally observed across Vietnam (Tết) and Korea (Seollal). Historically, East Asian cultures used this calendar for traditional age reckoning (xusui), wherein a child is considered one year old at birth and gains another year at the Lunar New Year.

Gregorian Comparison & Seasonal Alignment

Gregorian Alignment & Annual Variation

Because of its periodic leap-month corrections, the Chinese calendar never drifts unbound across the seasons. Instead, it oscillates in close proximity to the solar tropical cycle. Chinese New Year always falls on the second new moon following the winter solstice, invariably landing between January 21 and February 20 on the Gregorian calendar. The traditional year count is calculated by adding 2697 (or 2698 depending on civil new year conversion) to the Gregorian year. While your solar age increments on your Gregorian birthday, your traditional lunar age celebrates renewal alongside the broader cultural turn of the Spring Festival.

Frequently Asked Questions

Q1 How does a leap month (Runyue) work in the Chinese calendar?

A leap month (Runyue) is added approximately 7 times every 19 years to keep lunar months synchronized with the solar seasons. The Purple Mountain Observatory determines it astronomically: if a lunar month contains no major solar term (Zhongqi), it is inserted as an extra month repeating the number of the preceding month.

Q2 Why does Chinese New Year fall on a different Gregorian date every year?

Chinese New Year is tied to the lunar cycle, occurring on the second new moon after the winter solstice. Because 12 lunar months are ~11 days shorter than a solar year, the holiday shifts between January 21 and February 20 until an intercalary leap month resets the alignment.