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Enter your birth date to instantly calculate your exact age, traditional Chinese age, and total days alive, plus find your Chinese zodiac, horoscope, and lunar birthday.
The reference date defaults to today; you can freely switch it to view age at any moment.
Usage Tips
Exact Age
Born on 1990-01-15, calculated up to 2026-10-17.
Chinese Age (Xusui)
38
Traditional algorithm: 1 year old at birth, adds 1 year with each Chinese New Year.
Total Days Lived
13,424
Approx. 1917 Weeks
Total Months Lived
441
Born On (Day of Week)
Monday
Gregorian Date: 1990-01-15
Date
2027-01-15
Friday
Countdown
90
days away
275 days have passed since this birthday
Chinese Zodiac
Zodiac Sign
Overview
Understand what the tool solves, how it works, and the boundaries of its data.
Enter a Gregorian birth date and a reference date to see completed age in years, months, and days. The calculator also reports total elapsed days, whole weeks, whole months, a birthday countdown, and calendar details. Its “Chinese Age” result follows a Chinese lunar-year convention: it takes the reference date's lunar year, subtracts the birth date's lunar year, then adds one. It is distinct from completed age, which advances on the Gregorian birthday.
The Chinese lunar year does not begin on the same Gregorian date every year. A birth date in January or early February can map to the preceding lunar year. For example, the Hong Kong Observatory's 2026 conversion table maps Gregorian dates into lunar dates and identifies the first lunar month. This calendar boundary is why simply subtracting Gregorian birth years can give a different nominal-age result.
The page also derives the Chinese zodiac from the lunar birth year and shows a Western zodiac sign from the Gregorian month and day. These are separate calendar labels, not parts of the completed-age calculation.
Guide
Follow the workflow and verify inputs and outputs with practical examples.
Enter the date in the Gregorian calendar. This is the supported input; the form does not take a lunar-calendar date.
It defaults to today. Change it to calculate age on a past or future date, as long as the reference date is not before the birth date.
Read years, months, and days as completed calendar age. Total days, whole weeks, and whole months are elapsed-time summaries. The Chinese-age and zodiac results use lunar calendar conversion and should be read separately.
Review the next Gregorian birthday and days remaining. February 29 birthdays use February 28 in non-leap years for this countdown.
Use cases
See how the tool fits into real work and everyday tasks.
Use the years, months, and days output to describe time elapsed since a birthday as of a selected date. The reference date lets you reproduce an age for a past event.
Use the Chinese-age result when a family or cultural context explicitly asks for that lunar-year convention. Keep it separate from an age stated in completed years.
Q&A
Find concise answers to common questions and confusing cases.
This page's Chinese-age field uses a traditional Chinese lunar-year count. It starts at one for the birth lunar year and increases when the lunar year changes; other communities may use different age reckoning conventions.
The lunar-year count starts at one and changes at the lunar-year boundary, while completed age changes on the Gregorian birthday. Depending on where both dates fall, the difference varies.
No. Enter the Gregorian date shown on the calendar date you want to use. The calculator converts dates internally to determine its Chinese lunar-year result.
The birthday countdown treats February 28 as the birthday in a non-leap year. Rules used by an organization for a legal or administrative deadline can differ.
Notes
Review scope, result limitations, and important precautions before use.
This is a calendar calculation, not proof of identity or a determination of legal eligibility. For school enrollment, benefits, contracts, medical records, or deadlines, follow the relevant institution's definition of age. The Chinese-age result is a cultural calendar convention, not a substitute for completed age on official forms. Results are date-based and do not use time of birth or resolve time-zone disputes.
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