Chinese Calendar Converter
Convert between Gregorian calendar dates and the Chinese lunar calendar. Enter values for instant results with step-by-step formulas.
Formula
Zodiac Animal = (Year - 4) mod 12; Element = floor(((Year - 4) mod 10) / 2)
The zodiac animal repeats every 12 years starting from 4 CE (Year of the Rat). The five elements cycle every 10 years in pairs. The Heavenly Stem index is (Year - 4) mod 10, and the Earthly Branch index is (Year - 4) mod 12. Lunar months are approximated using the synodic period of 29.53 days from Chinese New Year.
Worked Examples
Example 1: Converting a 2024 Birthday
Problem: Convert February 10, 2024 (Chinese New Year 2024) to the Chinese calendar.
Solution: Feb 10, 2024 is Chinese New Year for the Year of the Dragon\nChinese Year: 2024 (starts this date)\nZodiac: Dragon (2024 - 4) mod 12 = 8 = Dragon\nElement: Wood (stems Jia = position 0, Wood pair)\nStem-Branch: Jia-Chen\n60-year cycle position: 41\nLunar date: Month 1, Day 1
Result: Chinese Year 2024 | Wood Dragon | Jia-Chen | Lunar Month 1, Day 1
Example 2: Finding Zodiac for January Birthday
Problem: What Chinese zodiac sign is someone born January 15, 2025? Note: Chinese New Year 2025 is January 29.
Solution: January 15 falls BEFORE Chinese New Year (Jan 29, 2025)\nTherefore the Chinese year is still 2024\nZodiac: (2024 - 4) mod 12 = 8 = Dragon\nElement: Wood\nThis person is a Wood Dragon, NOT a Snake\nThe Snake year begins January 29, 2025
Result: Chinese Year 2024 | Wood Dragon (not 2025 Snake, as CNY has not yet passed)
Frequently Asked Questions
How does the Chinese lunar calendar differ from the Gregorian calendar?
The Chinese calendar is a lunisolar calendar that tracks both the moon phases and the solar year. Each month begins on a new moon and lasts approximately 29 or 30 days, matching the synodic period of 29.53 days. Because twelve lunar months total only about 354 days, roughly 11 days short of a solar year, the Chinese calendar adds an intercalary or leap month approximately every three years following a 19-year Metonic cycle. This keeps the calendar aligned with the agricultural seasons. The Gregorian calendar is purely solar with fixed month lengths unrelated to moon phases. Chinese New Year falls between January 21 and February 20 each year, determined by the second new moon after the winter solstice.
What is the Chinese zodiac and how is my animal sign determined?
The Chinese zodiac is a repeating 12-year cycle where each year is associated with one of twelve animals: Rat, Ox, Tiger, Rabbit, Dragon, Snake, Horse, Goat, Monkey, Rooster, Dog, and Pig. Your zodiac animal is determined by your birth year in the Chinese calendar, not the Gregorian calendar. Since Chinese New Year falls in January or February, people born in those months must check whether their birthday falls before or after Chinese New Year to determine their correct zodiac animal. Each animal carries specific personality traits and cultural significance in Chinese tradition. The zodiac also combines with a ten-year cycle of five elements creating a complete 60-year grand cycle.
What are the Heavenly Stems and Earthly Branches in Chinese calendar notation?
The Heavenly Stems are a cycle of ten characters (Jia, Yi, Bing, Ding, Wu, Ji, Geng, Xin, Ren, Gui) and the Earthly Branches are a cycle of twelve characters (Zi, Chou, Yin, Mao, Chen, Si, Wu, Wei, Shen, You, Xu, Hai) that together form the traditional Chinese sexagenary cycle. Combined, they create a 60-year cycle since the least common multiple of 10 and 12 is 60. Each year, month, day, and even hour is designated by a unique stem-branch pair. This system has been used for over 2,000 years for timekeeping, fortune telling, and traditional Chinese medicine. The Earthly Branches correspond directly to the twelve zodiac animals.
What are the five elements and how do they relate to Chinese calendar years?
The five elements or Wu Xing in Chinese philosophy are Wood, Fire, Earth, Metal, and Water. Each element governs two consecutive years in the Heavenly Stems cycle, creating a ten-year pattern. Wood corresponds to stems Jia and Yi, Fire to Bing and Ding, Earth to Wu and Ji, Metal to Geng and Xin, and Water to Ren and Gui. Combined with the twelve zodiac animals, this creates sixty unique year designations. For example, 2024 is the year of the Wood Dragon. Each element has associated qualities: Wood represents growth and creativity, Fire represents passion and energy, Earth represents stability and nourishment, Metal represents precision and strength, and Water represents wisdom and adaptability.
How accurate is this Chinese calendar converter and what are its limitations?
This converter provides accurate zodiac animal, element, heavenly stem, and earthly branch calculations for any year. The lunar month and day calculations use astronomical approximations based on the average synodic month of 29.53 days and may differ from traditional Chinese almanac values by one to two days. Exact Chinese calendar dates require precise new moon calculations for specific time zones, traditionally based on Beijing time. Intercalary leap months are not explicitly identified in this simplified model. For critical dates such as weddings, festivals, or ancestral ceremonies, consult an official Chinese almanac or Tong Shu. The converter covers years from 1900 to 2100 and includes a lookup table for Chinese New Year dates from 2020 to 2035.
What is the difference between business days and calendar days?
Calendar days include every day. Business days (or working days) exclude weekends (Saturday and Sunday) and public holidays. A 10-business-day deadline is typically 14 calendar days. Legal and financial deadlines often specify which type applies.