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Age Calculator - Birthday & Date Calculator

Free age calculator to find your exact age from birth date. Calculates years, months, days, hours. Includes zodiac sign and generation info.

Age Calculator

Find your exact age from your birth date

Select what you want to calculate.

Enter your date of birth.

Date to calculate age at (leave blank for today).

Your Age

Enter your values to see results

and click the "Calculate" button

What is Age Calculation?

Age calculation determines the time elapsed from your birth date in years, months, and days. This tool not only calculates your age but also shows details like total days, hours, and minutes. You can also discover your zodiac sign, Chinese zodiac animal, and which generation you belong to. Useful for official documents, health tracking, or just curiosity.

How to Use This Calculator

  1. Enter your date of birth
  2. Optionally enter a target date (defaults to today)
  3. Click Calculate to see your age breakdown
  4. View bonus info like zodiac and generation

Age Calculation

Age = Target Year - Birth Year - (Birthday passed? 0 : 1)

Full years are counted when your birthday has passed this year. Months and days are calculated from the difference.

Frequently Asked Questions

How is age accurately calculated?
Count complete years from your birth date to the target date. If your birthday hasn't occurred yet this year, subtract 1 year. For example, someone born December 15, 1990 is still 35 years old on January 3, 2026.
When do leap year babies celebrate their birthday?
In non-leap years, February 29 babies typically celebrate on February 28 or March 1. Legally, most jurisdictions recognize March 1. A true February 29 birthday only comes every 4 years.
How do I calculate my age in days?
Count total days from birth to today, including leap years (366 days) and regular years (365 days). At 30 years old, you're approximately 10,950-10,958 days old.
How is my zodiac sign determined?
Your zodiac sign is based on the Sun's position on your birth date. The 12 signs span the year. Some birth dates fall on 'cusp' - the border between two signs - where your birth time determines the exact sign.
Which generation am I in?
By birth year: 1946-64 Baby Boomers, 1965-80 Gen X, 1981-96 Millennials (Gen Y), 1997-2012 Gen Z, 2013+ Gen Alpha. Those born near boundaries may share traits of both generations.

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