Find your exact age in years, months and days, plus total days lived and days to your next birthday.
Pick a date of birth to see the age.
NinjaFunction's Age Calculator works out your exact age from your date of birth. It shows years, months and days, the total months, weeks and days you have lived, the weekday you were born and how many days are left until your next birthday. You can also pick any other date to find your age on that day. Nothing you enter leaves your browser.
Many application forms ask for age in years, months and days. Counting by hand is easy to get wrong because months have 28 to 31 days. This calculator follows the calendar, so 31 January to 1 March in a leap year is 1 month and 1 day.
Age is counted in whole years first. You turn one year older on your birthday, not before. After the whole years, the calculator counts whole months, and the days that are left over. For example, someone born on 15 March 2000 is 25 years, 3 months and 0 days old on 15 June 2025, and 25 years, 3 months and 17 days old on 2 July 2025.
Leap years are handled by the calendar, so 29 February birthdays and 366-day years do not cause errors. A person born on 29 February is counted as having their birthday on 28 February in a common year.
Exams, job forms, school admissions and government schemes often ask for your age on a fixed date, such as 1 January or the last day of the application window. Set 'Age at the date of' to that date to see the age that counts for the form. If the form allows a minimum age of 18 and you are 17 years 11 months on the cut-off date, you do not qualify, even if you turn 18 a week later.
| Unit | What it tells you |
|---|---|
| Total months | Used for baby and child growth checks and some insurance forms |
| Total weeks | Used in pregnancy and early childhood milestones |
| Total days | Handy for fun milestones, such as your 10,000th day |
| Next birthday | Plan a party or a reminder |
The tool counts the full years from your date of birth, then the full months left over, then the remaining days. It uses the real calendar, so month lengths and leap years are handled.
Yes. Change the 'Age at the date of' box to any date after your birth date. This is useful for forms that ask for your age on a set date.
Your birthday is counted on 28 February in years that are not leap years.
The total days lived is shown in the results, with total weeks and months.
No. The calculation runs in your browser and nothing is sent anywhere.