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.

How Old Is Someone Born in 2016? Age Calculator

Your date of birth

Date of birth

Calculate age as of

Also show Korean age

Results

Total days: 3,739
Total weeks: 534
Total months: 122
Total hours: 89,736
Seconds lived: 0

2016 age range (2026)

	Age
Age after birthday (earliest DOB in year)	10
Age before birthday (latest DOB in year)	9

Browse 2016 by month

january 2016 february 2016 march 2016 april 2016 may 2016 june 2016 july 2016 august 2016 september 2016 october 2016 november 2016 december 2016

Example dates in 2016

Birth date	Current age	Calculator
January 1, 2016	10	Open
June 15, 2016	10	Open
September 10, 2016	10	Open
December 31, 2016	9	Open

All dates in 2016 (sample)

Date	Page
January 1, 2016	january-1-2016
January 15, 2016	january-15-2016
January 31, 2016	january-31-2016
February 1, 2016	february-1-2016
February 15, 2016	february-15-2016
February 29, 2016	february-29-2016
March 1, 2016	march-1-2016
March 15, 2016	march-15-2016
March 31, 2016	march-31-2016
April 1, 2016	april-1-2016
April 15, 2016	april-15-2016
April 30, 2016	april-30-2016
May 1, 2016	may-1-2016
May 15, 2016	may-15-2016
May 31, 2016	may-31-2016
June 1, 2016	june-1-2016
June 15, 2016	june-15-2016
June 30, 2016	june-30-2016
July 1, 2016	july-1-2016
July 15, 2016	july-15-2016
July 31, 2016	july-31-2016
August 1, 2016	august-1-2016
August 15, 2016	august-15-2016
August 31, 2016	august-31-2016
September 1, 2016	september-1-2016
September 15, 2016	september-15-2016
September 30, 2016	september-30-2016
October 1, 2016	october-1-2016
October 15, 2016	october-15-2016
October 31, 2016	october-31-2016
November 1, 2016	november-1-2016
November 15, 2016	november-15-2016
November 30, 2016	november-30-2016
December 1, 2016	december-1-2016
December 15, 2016	december-15-2016
December 31, 2016	december-31-2016

Age milestones

Age	Year reached
10	2026
13	2029
16	2032
18	2034
21	2037
25	2041

How this is calculated

Calendar age in years counts completed birthdays. A quick estimate is reference year minus birth year, then subtract 1 if the birthday has not yet occurred in the reference year.
Exact age = years + months + days between birth date and reference date, borrowing days from the previous month when needed.

Age = Reference date − Birth date

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

Nearby birth years

2014 2015 2016 2017 2018