Chinese lunar birthday finder. Enter your Gregorian birth date to get your lunar birthday, zodiac, and the next 10 Gregorian dates it falls on.
Chinese Lunar Birthday Finder
Enter your Gregorian birth date to find your lunar birthday (e.g. 五月初二) and the next 10 Gregorian dates it lands on.
How to use
Enter your Gregorian birth date
Type the solar (Gregorian) year, month, and day from your ID/passport. Range 1900-2100. Click "Today" to load the current date.
Read your lunar birthday
The tool converts it to your lunar birthday, e.g. 五月初二, and shows the matching zodiac and birth-year stem-branch (干支).
See the upcoming dates
Below, it lists the next 10 Gregorian dates (with weekday) that this lunar birthday falls on — so you can celebrate by the lunar calendar.
Check "next one in"
The top of the result shows how many days remain until your next lunar birthday, so you can plan ahead or remind family.
Your Lunar Birthday: Why the Gregorian Date Shifts Every Year
Many people in Chinese communities celebrate birthdays by the lunar calendar. Elders will say "you were born on 五月初二" (the 2nd day of the 5th lunar month) or "she's a 腊月廿三 baby." That lunar month-and-day pairing is the lunar birthday. Flip through a calendar, though, and you'll notice the same lunar birthday lands on a different Gregorian date every single year — June 5th one year, then May 25th the next. That drift is a direct consequence of the Chinese calendar being a lunisolar system. This tool converts your Gregorian birth date into your lunar birthday, then lists the next 10 Gregorian dates that lunar birthday falls on — so you never have to dig through an almanac again.
Lunar birthday vs Gregorian birthday
A Gregorian (solar) birthday is fixed: June 1st is always June 1st. A lunar birthday is locked to a lunar month-and-day instead — like 正月初一 (Lunar New Year) or 八月十五 (Mid-Autumn). Because lunar months follow the moon (a synodic month is about 29.5 days), twelve lunar months total only about 354 days — roughly 11 days short of the solar year. The calendar makes up the difference with leap months. The practical upshot is that any lunar date, mapped back onto the Gregorian calendar, wobbles forward and back from year to year, usually within a one-month window. This tool reconstructs that mapping precisely using astronomical formulae, with no manual table lookup.
What about a leap-month birthday?
A small number of people are born in a lunar leap month — say, 闰六月初十 (the 10th day of a leap 6th month). Leap months don't occur every year; on average there are 7 in every 19 years. If your lunar birthday falls in a leap month, the tool flags it as "leap month" and only lists Gregorian dates for years that actually contain that leap month — years without it are skipped automatically. Customs for celebrating a leap-month birthday vary: some people use the leap month in leap years and the regular month otherwise, while others always use the regular month. The tool simply gives you the accurate dates; how you choose to celebrate is up to you.
Practical uses for ASEAN Chinese families
In Singapore, Malaysia, Indonesia, and the Philippines, many families still mark elders' birthdays, a baby's "full month," and first-birthday celebrations by the lunar calendar. Yet schools, employers, and government registries all run on Gregorian dates. That creates a very common need: convert a lunar birthday into this year's (or the next few years') Gregorian date so you can pre-order a cake, request leave, or book a restaurant. By listing the next 10 Gregorian dates with their weekdays in one view, this tool covers exactly that planning use case. Every calculation runs locally in your browser — no birth date is ever uploaded or stored — keeping it aligned with PDPA and GDPR privacy expectations. Whether you're checking your own lunar birthday, looking up future celebration dates for a parent or grandparent, or simply curious which weekend your lunar birthday will land on next, you'll have the answer in seconds — no almanac, no spreadsheet, and no guesswork required.
10 Facts about Lunar Birthdays
The same lunar birthday falls on a different Gregorian date each year, usually drifting within about a one-month window — because the lunar year is roughly 11 days shorter than the solar year.
A lunar birthday is written as month + day, e.g. 五月初二, 八月十五. Days 1-10 use 初, 11-19 use 十, and 20-29 use 廿 in the traditional naming.
If you were born in a leap month (e.g. a leap 6th month), your "true" leap-month birthday does not occur every year — there are only 7 leap months in every 19 years on average.
For a leap-month lunar birthday, this tool only lists a Gregorian date for years that genuinely contain that leap month — other years are skipped automatically, never miscalculated.
Your zodiac is assigned by the lunar year, not Gregorian New Year. People born in January, before Lunar New Year, belong to the previous year's zodiac — a very common mix-up.
Traditionally, the lunar birthday carried more weight than the Gregorian one — milestone birthdays like the 60th and 70th (大寿) are usually reckoned by the lunar calendar.
In the 虚岁 (nominal age) system, a baby is "one" at birth and gains a year at each Lunar New Year — different from 周岁 (actual age) counted from the birthday.
A baby's 满月 (one-month celebration) and first-birthday 抓周 are reckoned by the lunar calendar in many Chinese families — this tool can help pin those to a Gregorian date too.
This tool supports Gregorian birth dates from 1900 to 2100, covering the lunar-birthday needs of virtually everyone alive today plus several future generations.
Vietnam, Korea, and others also keep lunar-calendar festivals and birthdays; the idea of a lunar birthday is widely shared across East Asian and ASEAN Chinese communities.
Frequently Asked Questions
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Your lunar birthday is the lunar month-and-day your birth fell on, e.g. 五月初二. Because the lunar calendar is lunisolar, that date maps to a different Gregorian day each year — which is exactly what this tool resolves.
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Because a lunar year (12 synodic months) is about 354 days — roughly 11 short of the solar year — and is corrected with leap months. So the same lunar date drifts on the Gregorian calendar, usually within a one-month range.
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It flags "leap month" and lists Gregorian dates only for years that actually contain that leap month; other years are skipped. How to celebrate (the leap month in leap years vs always the regular month) is a matter of local custom — the tool doesn't decide for you.
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By default it lists the next 10 Gregorian dates (from today onward) that the lunar birthday falls on, with the weekday — handy for planning celebrations, leave, or reservations ahead of time.
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Enter your Gregorian (solar) birth date — the one printed on your ID or passport. The tool converts it to your lunar birthday and then computes the future Gregorian dates.
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By the lunar year. The zodiac switches at Lunar New Year (正月初一), not Gregorian New Year. So someone born in January, before Lunar New Year, belongs to the previous year's zodiac.
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No. All conversion happens locally in your browser with no server calls. RECATOOLS applies zero-tracking, zero-storage to every tool input — aligned with PDPA and GDPR.
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Gregorian years 1900 to 2100 — the high-precision window of the underlying astronomical algorithm, covering virtually everyone alive today and several future generations.
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This tool only converts the lunar birthday date; it doesn't compute 虚岁. Nominal age is a separate system (one at birth, +1 each Lunar New Year). For age counting, use a dedicated age tool.
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It runs on the open-source lunar-javascript library (MIT-licensed), implementing modern astronomical formulae (lunar phase, solar longitude) and closely matching the official almanac from Purple Mountain Observatory. The source is fully auditable.
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