How do I calculate my age from my date of birth?

Subtract your birth year from the current year. If your birthday has not happened yet this year, subtract one more year from that total. Then count the months and days separately using the same subtract-and-borrow method. This tool does all of that automatically. You just get the finished answer.

Can I calculate my age on a specific date?

Yes. Instead of leaving the calculate-as-of field on today, pick any date, past or future, and the tool works out your age as of that day. Use this for school enrollment cutoffs, immigration age requirements, or figuring out how old you will be on a future date like a wedding or retirement.

How does this handle leap years?

Leap years are built into the calendar math, not added as an afterthought. If someone's birthday is February 29, this tool treats it as February 28 in non-leap years for counting elapsed years, the same convention most legal and administrative systems use, while still calculating the exact day count correctly underneath.

What is chronological age?

Chronological age is the time that has passed since birth, measured in the calendar: years, months, and days. It is different from biological age, which estimates how old a body seems rather than how long a person has actually been alive. When a form or a doctor asks for your age, chronological age is what they mean.

How is Korean age different from international age?

Korean age starts at one, not zero, on the day someone is born, and everyone's age increases together on New Year's Day instead of on individual birthdays. Depending on birth month, that can put Korean age one or two years ahead of the international age most of the world uses. Toggle Also show Korean age to see both numbers at once.

How do I calculate age difference between two people?

Switch to the Age Difference tab, enter both birth dates, and the calculator returns the gap as years, months, and days, plus a flat day count if you need one number instead of three. It works the same way whether the gap is a few months or several decades.

How accurate is this online tool?

It is accurate to the day, using real calendar date math rather than a simplified days-divided-by-365 estimate. Leap years, varying month lengths, and the borrow-a-month logic are all handled correctly. The one thing it cannot account for is a wrong birth date typed in.

How do I calculate age in Excel?

Put the birth date in a cell, then wrap it in Excel's DATEDIF function with "Y", "YM", and "MD" as the unit arguments to pull out years, months, and days separately. The full formula is in the Excel section above. It is the same calendar-based approach this tool uses, just typed out manually.

Yes. Everything runs in your browser using JavaScript. Your birth date never leaves your device. There are no servers processing your information and no account required. You can disconnect from the internet after loading the page and the calculator still works.

Can I use this for my pet?

Yes. Click the Pet Age tab, choose dog or cat, and enter how many years old your pet is. The tool converts to human-equivalent age using the standard veterinary formula, not the old seven dog years equals one human year shortcut.

Wie alt ist jemand, geboren 2006? Altersrechner

Your date of birth

Date of birth

Calculate age as of

Also show Korean age

Results

Total days: 7,392
Total weeks: 1,056
Total months: 242
Total hours: 177,408
Seconds lived: 0

2006 age range (2026)

	Alter
Alter nach dem Geburtstag (frühestes Datum im Jahr)	20
Alter vor dem Geburtstag (spätestes Datum im Jahr)	19

Browse 2006 by month

january 2006 february 2006 march 2006 april 2006 may 2006 june 2006 july 2006 august 2006 september 2006 october 2006 november 2006 december 2006

Example dates in 2006

Geburtsdatum	Aktuelles Alter	Calculator
1. Januar 2006	20	Open
15. Juni 2006	20	Open
10. September 2006	20	Open
31. Dezember 2006	19	Open

All dates in 2006 (sample)

Date	Page
1. Januar 2006	january-1-2006
15. Januar 2006	january-15-2006
31. Januar 2006	january-31-2006
1. Februar 2006	february-1-2006
15. Februar 2006	february-15-2006
28. Februar 2006	february-28-2006
1. März 2006	march-1-2006
15. März 2006	march-15-2006
31. März 2006	march-31-2006
1. April 2006	april-1-2006
15. April 2006	april-15-2006
30. April 2006	april-30-2006
1. Mai 2006	may-1-2006
15. Mai 2006	may-15-2006
31. Mai 2006	may-31-2006
1. Juni 2006	june-1-2006
15. Juni 2006	june-15-2006
30. Juni 2006	june-30-2006
1. Juli 2006	july-1-2006
15. Juli 2006	july-15-2006
31. Juli 2006	july-31-2006
1. August 2006	august-1-2006
15. August 2006	august-15-2006
31. August 2006	august-31-2006
1. September 2006	september-1-2006
15. September 2006	september-15-2006
30. September 2006	september-30-2006
1. Oktober 2006	october-1-2006
15. Oktober 2006	october-15-2006
31. Oktober 2006	october-31-2006
1. November 2006	november-1-2006
15. November 2006	november-15-2006
30. November 2006	november-30-2006
1. Dezember 2006	december-1-2006
15. Dezember 2006	december-15-2006
31. Dezember 2006	december-31-2006

Altersmeilensteine

Alter	Jahr erreicht
18	2024
21	2027
25	2031
30	2036

So wird berechnet

Das Kalenderalter zählt vollendete Geburtstage. Grob: Referenzjahr minus Geburtsjahr, minus 1 wenn der Geburtstag noch aussteht.
Genaues Alter = Jahre + Monate + Tage zwischen Geburts- und Referenzdatum, mit korrekter Monatslänge.

Age = Reference date − Birth date

Weeks ≈ total days ÷ 7. Hours = total days × 24. Minutes = total hours × 60 (exact for whole-day spans).

Nahe Geburtsjahre

2004 2005 2006 2007 2008