Age calculator
Exact age in years, months and days.
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How it's calculated
Age in years counts completed birthdays between the date of birth and today: the year difference, less one if this year’s birthday has not happened yet. The months figure is the completed calendar months since the last birthday. Days and weeks are the plain count of days between the two dates, so a leap day counts like any other day.
How is age counted when the birthday is February 29?
Most places treat March 1 as the birthday in non-leap years, which is what this tool does: the year counts as complete once the calendar passes the birth month and day.
Why is my age in days not years × 365?
Leap years add a day every four years, so someone who is exactly 36 has lived about 13,149 days, not 13,140.
Can I find the age on a date other than today?
Use the Days between dates calculator with the birth date as the start and the other date as the end; it shows years, months, weeks and days.
Results are estimates for informational purposes only and are not financial, medical or legal advice.