Age Calculator
Work out exact age in years, months and days from a date of birth, plus total days and days to the next birthday.
What is the Age Calculator?
This age calculator takes a date of birth and an as-on date and returns the exact age in years, months and days. It also shows the total months and days lived and how many days remain until the next birthday. Leave the as-on date empty to use today.
How it works
Complete months between the two dates give years and months. The days left over are counted from the last monthly anniversary, using the last day of a short month when the birth day does not exist. Total days are the exact calendar difference between the dates.
How to use it
- Enter the date of birth.
- Leave the as-on date empty to use today, or pick another date.
- Read the age in years, months and days.
- Check the total days lived and the days to the next birthday.
Age Calculator — FAQ
Can I find my age on a past or future date?
Yes. Enter any date in the as-on field, such as an admission or exam date, and the age is worked out as of that day.
How are leap-day birthdays handled?
For a 29 February birthday, the tool treats 28 February as the birthday in years that are not leap years.
Why can age in months and days look unusual?
Months have different lengths. The tool counts whole months first and then the remaining days from the last monthly anniversary.