How this age calculator works
Enter a date of birth and, if you like, a different date to measure to. The calculator counts complete years first, then the remaining complete months, then the remaining days. Example: someone born on 15 March 1995 is 31 years, 3 months and 5 days old on 20 June 2026.
It also shows your age as a single total in months, weeks, days and hours, which is handy for fun facts, school forms or milestone dates.
How to use it
- Pick your date of birth.
- Leave the second date as today, or choose another date to find the age on that day.
- Press Calculate to see your age, totals, birth weekday and next birthday.
Leap years and 29 February
Leap years add an extra day, and the calculator accounts for them when it counts days. For people born on 29 February, the tool treats 1 March as the birthday in years that are not leap years. Legal rules for the exact day vary by country.
When you need an exact age
- School and university admission cut-off dates.
- Job, visa and government forms that ask for age on a certain date.
- Retirement, insurance and pension planning.
- Sports and competitions with age categories.
Good to know
This tool is for information. For official purposes, your birth certificate or national ID decides your age.
Roughly how long is 30 years?
| Unit | About |
|---|---|
| Months | 360 |
| Weeks | 1,565 |
| Days | 10,958 |
| Hours | 262,980 |
Frequently Asked Questions
How do I calculate my exact age?
Subtract your date of birth from the target date, counting full years, then full months, then days.
Can I find my age on a past or future date?
Yes. Change the second date to any date you like.
How many days old am I?
The calculator shows the total number of days between the two dates.
How does it handle leap years?
Leap days are counted in the day totals. A 29 February birthday is treated as 1 March in non-leap years.
What day of the week was I born?
The calculator shows the weekday of your date of birth.
Is my data stored?
No. The calculation runs in your browser, so the numbers you enter are not sent to our server.