Age Calculator
Find your exact age in years, months and days — plus the totals in months, weeks and days. Just pick your date of birth.
Pick your date of birth to begin.
How to calculate age
Your age is the time elapsed between your date of birth and a later date — usually today. Because months have different lengths and leap years add an extra day, the most natural way to express age is in whole years, then the remaining whole months, then the leftover days. This calculator does that for you and also converts the span into total months, weeks and days.
What you can use it for
- Find your precise age for forms, applications or eligibility.
- Work out a child's age in months for milestones.
- Count down to a birthday or anniversary.
- Measure the gap between any two dates.
Frequently asked questions
How does the age calculator work?
Enter your date of birth and the date you want to measure to (it defaults to today). The calculator breaks the difference into exact years, months and days, and also shows the totals in months, weeks and days.
How are months and days counted?
It counts full calendar months and the leftover days, accounting for the differing lengths of months and for leap years — the same way you'd naturally say your age.
Can I calculate age at a future or past date?
Yes. Change the second date to any date on or after the birth date to find how old someone was, or will be, on that day.
Is my data private?
Yes. The dates you enter are processed only in your browser. Nothing is uploaded or stored.