Age Calculator

Calculate your exact age instantly

Enter your birthdate to instantly calculate your exact age in years, months, days, weeks, and hours. This free tool also shows your Western and Chinese zodiac signs, plus a countdown to your next birthday. All calculations are performed in your browser for complete privacy protection.

How to Use

Calculate your age in 3 simple steps:

Enter Your Birthdate

Select your date of birth using the date picker or enter it manually (YYYY-MM-DD format).

Choose Target Date (Optional)

By default, today's date is used. Change it to calculate age at any specific date.

View Results Instantly

Your exact age, zodiac signs, total days lived, and days until next birthday are displayed immediately.

Privacy Protection: All calculations are performed in your browser. No personal data is sent to any server.

Your Age

years: -- months: -- days: --

Western Zodiac

Chinese Zodiac

Total Months

Total Weeks

Total Days

Total Hours

Enter Your Birthdate

Date of Birth

Calculate Age As Of

Practical Use Cases

This age calculator is useful in many situations:

1. Legal Age Verification

Quickly verify if someone meets age requirements for driving licenses, voting, alcohol purchase, retirement benefits, or other age-restricted activities and services.

2. Birthday Planning & Celebrations

Plan milestone birthday celebrations by knowing exactly how many days until the next birthday. Great for party planning and sending timely birthday wishes.

3. Insurance & Financial Planning

Insurance premiums and retirement planning often depend on exact age. This calculator helps determine precise age for policy applications and financial calculations.

4. Medical & Healthcare Applications

Medical dosages, vaccination schedules, and health screenings are often age-dependent. Healthcare providers can quickly calculate patient ages for accurate care.

5. School Enrollment & Education

Determine if a child meets age requirements for school enrollment, grade placement, or eligibility for age-specific educational programs and competitions.

6. Historical & Genealogy Research

Calculate ages of historical figures, ancestors in family trees, or determine age differences between relatives for genealogy projects.

About Age Calculation

Age calculation determines the time elapsed from birth to a specific date. This calculator provides comprehensive age information including years, months, days, and various zodiac signs.

How Age is Calculated

Age is calculated by comparing the birthdate with the target date. The calculation accounts for varying month lengths and leap years to provide an accurate result.

For example, if born on January 15, 1990, and today is December 17, 2025:
- Years: 35
- Months: 11
- Days: 2

The calculation considers that different months have different numbers of days (28-31), ensuring precise results.

Western Zodiac Signs

Western astrology divides the year into 12 zodiac signs based on the position of the sun at birth:

- 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)

Chinese Zodiac Signs

The Chinese zodiac is a 12-year cycle, with each year represented by an animal:

- Rat, Ox, Tiger, Rabbit, Dragon, Snake
- Horse, Goat, Monkey, Rooster, Dog, Pig

Your Chinese zodiac sign is determined by the year of your birth. The cycle repeats every 12 years, so people born 12, 24, 36 years apart share the same sign.

Frequently Asked Questions

How accurate is this age calculator?

This calculator is highly accurate, accounting for varying month lengths (28-31 days) and leap years. It calculates age down to the exact day, giving you years, months, and days.

Does this calculator account for leap years?

Yes, the calculator automatically accounts for leap years. If you were born on February 29, it correctly calculates your age even in non-leap years.

Can I calculate age for a future date?

The calculator is designed to calculate age from birth to a past or current date. For future projections, set the 'Calculate Age As Of' field to your desired future date.

How is age calculated when born on the 31st?

If you're born on the 31st and the current month has fewer days, the calculator correctly handles this by using the last day of the month for comparison.

What is the legal age for various activities?

Legal ages vary by country: Voting (16-21), Driving (15-18), Alcohol (18-21), Marriage (16-21), Working (14-18). Always verify with local laws as requirements differ by jurisdiction.

Why do I need to know my age in days?

Age in days is useful for: milestone celebrations (like 10,000 days old), medical calculations, precise insurance quotes, and interesting personal statistics.

Are zodiac signs scientifically accurate?

Zodiac signs are based on astrological traditions rather than scientific evidence. They're included for cultural interest and entertainment. Western signs are based on birth date, while Chinese signs are based on birth year.

Can I use this for someone else's age?

Yes! Simply enter any birthdate to calculate age. This is useful for calculating children's ages, relatives' ages, historical figures, or age differences between people.