How Old Are You?

Welcome to the How Old Are You? calculator — the most comprehensive age calculator on the web. Enter your date of birth to discover your exact age in years, months, weeks, days, hours, minutes, and seconds. Get your zodiac sign, Chinese zodiac animal, birthstone, life milestones timeline, birthday countdown, and fascinating life statistics like how many times your heart has beaten.

How Is Your Exact Age Calculated?

Calculating your precise age is more nuanced than simply dividing total days by 365. Months have varying lengths (28-31 days), leap years add an extra day, and the calculation must properly handle boundary conditions. Our calculator uses calendar-aware arithmetic that accounts for all of these factors:

1. Years: Count complete years from your birth date to today
2. Months: Count remaining full months after subtracting complete years
3. Days: Count remaining days after subtracting complete years and months

For example, if you were born on March 15, 1990, and today is February 12, 2026, your exact age is 35 years, 10 months, and 28 days — not just "35 years old."

Age in Different Units

Beyond years and months, our calculator converts your age into multiple time units for fun and perspective:

• Weeks: Total days divided by 7
• Hours: Total days multiplied by 24
• Minutes: Total hours multiplied by 60
• Seconds: Total minutes multiplied by 60 — with a live counter that ticks in real-time

Birthday Countdown

Never miss your next birthday. The calculator shows exactly how many days remain until your next birthday and what day of the week it falls on. For February 29 (leap year) birthdays, it handles the special case by defaulting to February 28 in non-leap years.

Zodiac Signs

Western Zodiac

Your Western (sun) zodiac sign is determined by your birth date and corresponds to one of 12 constellations the sun passes through during the year:

Chinese Zodiac

The Chinese zodiac follows a 12-year cycle, with each year assigned an animal: Rat, Ox, Tiger, Rabbit, Dragon, Snake, Horse, Goat, Monkey, Rooster, Dog, and Pig. Your Chinese zodiac animal is determined by your birth year.

Life Milestones

The milestones timeline shows significant age markers you have reached and upcoming ones to look forward to — from your first birthday through becoming a centenarian. Reached milestones are shown with dates, while upcoming ones display how many days remain.

Life Statistics

Our calculator estimates fascinating statistics about your life so far:

• Heartbeats: Based on an average resting heart rate of 72 beats per minute
• Breaths: Based on an average respiratory rate of 16 breaths per minute
• Seasons lived: Approximate count based on ~91.25 days per season
• Leap years: Number of leap years you have experienced

Frequently Asked Questions

How do I calculate exactly how old I am?

To calculate your exact age, subtract your date of birth from today's date. This gives you your age in years, months, and days. For precise results, you need to account for varying month lengths and leap years. Our calculator handles all of this automatically — just enter your birthday and get your exact age instantly.

How many days old am I?

To find how many days old you are, calculate the number of days between your date of birth and today. This includes accounting for leap years (which add an extra day every 4 years). Our age calculator shows your age in days along with hours, minutes, and seconds for a complete picture.

How many seconds have I been alive?

To calculate how many seconds you have been alive, first find the total number of days since your birth, then multiply by 86,400 (the number of seconds in a day: 24 hours x 60 minutes x 60 seconds). Our calculator does this automatically and even includes a live counter that updates in real-time.

When is my next birthday and how many days until then?

Our calculator automatically determines your next birthday date, what day of the week it falls on, and exactly how many days remain until then. It also handles special cases like leap year birthdays (February 29).

What zodiac sign am I based on my birthday?

Your Western zodiac sign is determined by your birth date: Aries (Mar 21-Apr 19), Taurus (Apr 20-May 20), Gemini (May 21-Jun 20), Cancer (Jun 21-Jul 22), Leo (Jul 23-Aug 22), Virgo (Aug 23-Sep 22), Libra (Sep 23-Oct 22), Scorpio (Oct 23-Nov 21), Sagittarius (Nov 22-Dec 21), Capricorn (Dec 22-Jan 19), Aquarius (Jan 20-Feb 18), Pisces (Feb 19-Mar 20). Our calculator identifies your sign automatically.

What is my Chinese zodiac animal?

Your Chinese zodiac animal is determined by your birth year in a 12-year cycle: Rat, Ox, Tiger, Rabbit, Dragon, Snake, Horse, Goat, Monkey, Rooster, Dog, and Pig. Each animal is associated with certain personality traits and characteristics. Our calculator identifies your Chinese zodiac animal based on your birth year.

Additional Resources

• Zodiac - Wikipedia
• Chinese Zodiac - Wikipedia