Age Calculator: Find Your Exact Age from Your Date of Birth
This age calculator works out exactly how old you are from your date of birth, down to the years, months, and days. Pick your birthday and your age appears instantly, along with a countdown to your next one.
It does more than answer "how old am I". The same result breaks your life down into total months, weeks, days, hours, minutes, and live-updating seconds, then adds your zodiac signs, your generation, the weekday you were born, your current life stage, and the day-count milestones you have already crossed or are approaching.
How to Use the Age Calculator
Enter your date of birth
Click the Date of Birth field and choose your birth year, month, and day from the calendar. The result appears the moment you pick a date.
Choose a target date (optional)
By default your age is figured as of today. To see your age on a different day, set the Calculate Age at field to any past or future date.
Read your results
See your exact age in years, months, and days, your next birthday countdown, time lived in every unit, birth facts, both zodiac signs, your life stage, and your milestones.
Copy your result
Press Copy Result to put a short age summary on your clipboard, ready to paste into a form, message, or document.
Features
Exact Age Calculation
Get your precise age in years, months, and days, correctly handling leap years and months of different lengths.
Flexible Target Date
Calculate your age as of any date, not just today, to check eligibility or look back and ahead in time.
Multiple Time Units
See your age in total months, weeks, days, hours, and minutes, plus live-updating seconds when the target date is today.
Birthday Countdown
Always know how many days until your next birthday, with a special note when it falls today or tomorrow.
Birth Information
Discover the weekday you were born, whether it was a leap year, how many leap years you have lived, and your generation.
Zodiac Signs
View both your Western zodiac sign, from your birth month and day, and your Chinese zodiac animal, from your birth year.
Life Stage Insights
Read a short, personalized note on your current phase of life, drawn from twelve stages between infancy and the wisdom era.
Life Milestones
Track day-count milestones such as 10,000 days and 1 billion seconds, each with the date you reached it or a countdown to it.
Copy Results
Copy a clean age summary to your clipboard in one click for forms, messages, or documents.
Saved Automatically
Your birth date is remembered in your browser, so it is restored ready to go the next time you return.
Frequently Asked Questions
How do I calculate my exact age from my date of birth?
Enter your date of birth in the Date of Birth field. The calculator instantly shows your age as full years, then the leftover months, then the leftover days, measured up to today unless you set a different target date.
How is age calculated in years, months, and days?
The calculator finds the difference between your birth date and the target date, accounting for months that range from 28 to 31 days and for leap years. It counts complete years first, then the remaining whole months, then the remaining days.
Why does my age in days differ from years times 365?
Because not every year has 365 days. Leap years have 366, and months vary in length. The calculator counts the actual number of days between the two dates, so the total is more precise than a simple year-times-365 estimate.
Can I find my age on a future or past date?
Yes. Set the Calculate Age at field to any date you like. This lets you check what your age was on a past date or what it will be on a future one, which is handy for eligibility or planning.
Which generations does the calculator recognize?
It assigns a generation from your birth year: Gen Alpha (2013 and later), Gen Z (1997–2012), Millennial (1981–1996), Gen X (1965–1980), Baby Boomer (1946–1964), Silent Generation (1928–1945), and the Greatest Generation before that.
How accurate are the zodiac calculations?
Western signs follow the standard date ranges used in Western astrology, based on your birth month and day. The Chinese zodiac animal comes from your birth year on the traditional 12-year cycle; this tool uses the solar year for simplicity rather than the lunar calendar.
What is the 1 billion seconds milestone?
One billion seconds is roughly 31 years and 8 months of life. It is a fun, unusual milestone that many people enjoy marking, and the calculator shows either the date you passed it or a countdown to when you will.
Why do the seconds update in real time?
When the target date is today, the seconds counter ticks up every second to show your exact age at this moment. If you select any other target date, the seconds display a fixed value for that date instead.
Is my birth date stored privately?
Yes. Your birth date is saved only in your own browser's local storage on your device and is never sent to any server. You can remove it at any time by clearing your browser data.
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