orbitHow to calculate age
Select a date of birth in the date field. The calculator immediately shows the exact age as of today in full years, months and days, based on the date of the device you are using.
How the age is calculated
The calculator counts complete calendar years first, then complete months, then the remaining days. When the day of the month has not been reached yet, it borrows the length of the previous month, so the result is correct for months with 28, 29, 30 or 31 days and for leap years.
Example: someone born on 15 March 1990 is, on 10 June 2026, 36 years, 2 months and 26 days old.
When you need an exact age
- Forms and applications that ask for age at a specific date.
- Checking eligibility for school entry, sports categories, insurance or retirement plans.
- Tracking a baby’s or a pet’s age in months.
- Working out the age of a document, a building or a company from its founding date.
Frequently asked questions
How is a birthday on 29 February handled?
In non-leap years the calculator counts the full year as completed on 1 March. Rules for legal purposes differ between countries, so check local regulations for official matters.
Is the birth date stored?
No. The calculation is done in your browser and nothing is saved or sent anywhere.