Age Calculator — How Old Am I?

How old are you exactly? Enter your date of birth to find your precise age in years, months, days, hours, minutes, and seconds. This free age calculator also shows your Korean age, zodiac sign, Chinese zodiac, generation, next birthday countdown, and fun facts.

By Jordan Rivera|Updated Feb 22, 2026

How to Calculate Your Exact Age

Calculating your exact age might seem straightforward, but it involves several nuances that make it trickier than simple subtraction. Here is what our calculator accounts for:

Varying month lengths: Months range from 28 to 31 days, so the number of days in each month must be considered individually when computing age breakdowns.
Leap years: Every four years (with exceptions for century years not divisible by 400), February has 29 days instead of 28. This affects total day counts significantly over a lifetime.
Calendar edge cases: If you were born on the 31st of a month and the current month has only 30 days, the calculation needs to handle the overflow correctly.
Hours, minutes, and seconds: Our calculator extends beyond days to show your age in hours, minutes, and seconds for a truly precise measurement.

Your Age in Different Units

Beyond years, months, and days, it can be fascinating to see your age expressed in other units:

Total days: The average person who lives to 80 years old will experience roughly 29,200 days. Seeing your total day count puts time in perspective.
Total hours: A 30-year-old has lived approximately 262,980 hours. That is a lot of time!
Total weeks: Each year has approximately 52.18 weeks. By age 30, you have lived through about 1,565 weeks.
Total months: A 25-year-old has lived exactly 300 months. Milestones like 500 or 1,000 months can be fun markers to celebrate.

Zodiac Signs by Birthday

Your zodiac sign is determined by the position of the sun relative to the constellations at the time of your birth. The twelve signs of the Western zodiac are:

Aries: March 21 - April 19
Taurus: April 20 - May 20
Gemini: May 21 - June 20
Cancer: June 21 - July 22
Leo: July 23 - August 22
Virgo: August 23 - September 22
Libra: September 23 - October 22
Scorpio: October 23 - November 21
Sagittarius: November 22 - December 21
Capricorn: December 22 - January 19
Aquarius: January 20 - February 18
Pisces: February 19 - March 20

Chinese Zodiac Animals

The Chinese zodiac assigns an animal to each year in a 12-year cycle. The animals are: Rat, Ox, Tiger, Rabbit, Dragon, Snake, Horse, Goat, Monkey, Rooster, Dog, and Pig. Each animal is believed to influence the personality traits of people born in that year.

Korean Age vs International Age

In the traditional Korean age system, a person is considered 1 year old at birth and gains a year every January 1st, regardless of their actual birthday. This means a Korean age is typically 1–2 years older than the international (Western) age. For example, a baby born on December 31 would be 1 year old at birth and turn 2 the very next day (January 1). South Korea officially adopted the international age system for legal purposes in June 2023, but Korean age is still widely used in everyday conversation.

Generations by Birth Year

Your generation is determined by the year you were born and reflects shared cultural experiences:

Greatest Generation: Born before 1928 — lived through the Great Depression and World War II
Silent Generation: 1928–1945 — grew up during wartime, known for civic duty
Baby Boomers: 1946–1964 — post-war population boom, cultural revolution
Generation X: 1965–1980 — latchkey kids, rise of personal computers
Millennials (Gen Y): 1981–1996 — digital natives, grew up with the internet
Generation Z: 1997–2012 — smartphone generation, social media natives
Generation Alpha: 2013+ — born into a world of AI and smart devices

Interesting Age Facts

You share your birthday with approximately 20.5 million other people worldwide (based on a global population of 8 billion and 365 days)
The most common birthday in the United States is September 9th, approximately nine months after the holiday season
People born on February 29th (leap day) technically only have a birthday once every four years, though they still age normally
In some East Asian cultures, a person is considered one year old at birth and gains a year on New Year's Day rather than their birthday
The oldest verified person ever was Jeanne Calment of France, who lived to 122 years and 164 days
Your heart beats about 100,000 times per day, meaning a 30-year-old's heart has beaten over 1 billion times

Frequently Asked Questions

How to calculate exact age from date of birth?

To calculate your exact age, subtract your birth date from today's date. Start with the days: if today's day is less than your birth day, borrow a month. Then subtract months: if today's month is less than your birth month, borrow a year. Finally subtract the years. Our calculator handles all of this automatically, including leap years and varying month lengths, and also shows your age in hours, minutes, and seconds.

How many days old am I?

To find how many days old you are, enter your birth date in our age calculator. It computes the exact number of days between your birthday and today (or any target date). For example, someone born on January 1, 2000 would be over 9,500 days old by 2026. The calculator accounts for leap years, so the count is precise.

What is my zodiac sign based on my birthday?

Your zodiac sign is determined by your birth date. The twelve Western zodiac signs are: 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), and Pisces (Feb 19 - Mar 20). Our age calculator shows your zodiac sign automatically.

What is my Chinese zodiac animal?

Your Chinese zodiac animal is determined by your birth year in the traditional Chinese calendar. The twelve animals cycle in this order: Rat, Ox, Tiger, Rabbit, Dragon, Snake, Horse, Goat, Monkey, Rooster, Dog, and Pig. Each animal repeats every 12 years. For a simple approximation, our calculator uses the Gregorian birth year to determine your Chinese zodiac animal.

How to calculate age between two dates?

Our age calculator lets you calculate the difference between any two dates, not just from a birth date to today. Simply enter the start date in the "Date of Birth" field and the end date in the "Calculate To" field. The calculator will show the exact years, months, days, hours, minutes, seconds, total days, and total weeks between the two dates.

What is Korean age and how is it different?

Korean age (also called "East Asian age reckoning") counts you as 1 year old at birth and adds a year every January 1st, not on your birthday. This means your Korean age is always 1 or 2 years older than your international age. South Korea officially adopted the international system in June 2023, but Korean age is still commonly used socially. Our calculator shows both your international and Korean age.

What generation am I based on my birth year?

Generations are defined by birth year ranges: Greatest Generation (before 1928), Silent Generation (1928-1945), Baby Boomers (1946-1964), Generation X (1965-1980), Millennials or Gen Y (1981-1996), Generation Z (1997-2012), and Generation Alpha (2013+). Our age calculator automatically identifies your generation based on your date of birth.