How to use the Age Calculator
- Enter a date of birth.
- Leave “Age at this date” as today, or pick another date.
- See the exact age plus totals in months, weeks, days and hours.
- Optional: enter an age to find its milestone date.
How exact age is calculated
We count complete years first, then complete months, then the remaining days — the same way you would count on a calendar. Leap years are handled automatically. People born on 29 February are treated as having their birthday on 28 February in non-leap years.
Uses
Checking eligibility for school, retirement or insurance, filling in forms, calculating the age of a pet or a building, or just finding out how many days you have been alive.
Frequently asked questions
How many days old am I?
Enter your birth date — the total days lived is shown under the result.
Do you store my birthday?
No. The calculation happens in your browser.