About the Age Calculator
Find your exact age, or anyone's, on any date: years, months and days, plus total months, weeks and days lived, the day of the week you were born and a countdown to your next birthday.
Key features
- Exact age in years, months and days
- Age on any date, past or future
- Total months, weeks and days lived
- Day of the week you were born
- Countdown to your next birthday
- Handles leap years and leap-day birthdays
How old am I exactly?
Enter a date of birth to get an exact age in years, months and days, plus fun facts such as total days lived and the weekday you were born. Change the "Age on" date to calculate age at any point in time.
Example
Born 15 May 1990, age on 20 October 2026:
| Measure | Result |
|---|---|
| Age | 36 years, 5 months, 5 days |
| Total months | 437 |
| Total weeks | 1,901 |
| Total days | 13,307 |
| Born on a | Tuesday |
| Next birthday | in 207 days |
How the calculation works
- Count full years from the birth date.
- From the last birthday, count full months.
- The remaining days are counted from the last "month-day".
Months have 28–31 days, so "1 month" isn't a fixed number of days. That's why exact ages are calculated on the calendar rather than by dividing by 30.
Common uses
- Forms and applications asking for age on a specific date.
- School admissions and sports age groups with cut-off dates.
- Retirement and pension planning.
- Milestones: when will you be 10,000 days old? (About 27 years and 4 months.)
Related calculators
Count the days between any two dates with the Date Difference Calculator, or count down to your birthday with the Countdown Timer.
How to use the Age Calculator
- Enter your numbers in the fields above. Units and options can be changed at any time.
- The result updates instantly as you type; there's no calculate button to press.
- Check the breakdown under the main result for the details behind the number.
- Adjust the inputs to compare scenarios, for example a different rate or term.