Age Calculator
Exact age in years, months and days from a birth date.
Find your exact age — or anyone else’s — down to the day. Enter a date of birth to see the years, months and days that have passed, plus the totals in days and weeks.
Formula / method
Examples
~26 years
~36 years
How age is counted
This calculator gives your exact age in years, months and days from your date of birth to today, plus the totals in days and weeks. It accounts for the different lengths of months and for leap years, so the count matches how a calendar actually works rather than a rough 365-day estimate.
Uses beyond curiosity
Precise age matters for forms, eligibility cut-offs, milestone dates and working out how many days remain until a birthday or deadline. To measure the gap between two arbitrary dates rather than from birth to today, the Date Difference Calculator does the same maths between any start and end date.
Where it's used
- Finding an exact age in years, months, and days for a form or application
- Working out a baby's age in months for milestone or vaccination schedules
- Counting the days until a birthday or anniversary
- Checking age eligibility for voting, driving, or retirement dates
- Measuring the age gap between two people or two events
Real-world examples
- A parent finding a baby born on 2025-03-15 is exactly 15 months old today
- Someone born on 1990-07-02 confirming they are 36 as of July 2026
- A couple calculating that their wedding on 2010-09-20 was over 5,700 days ago
Did you know?
Not every country counts age the same way: on 28 June 2023 South Korea officially dropped its traditional 'Korean age' system (where a baby is one at birth and everyone ages a year each January 1), standardizing on international age and making millions of people a year or two younger overnight.
FAQ
Does it count leap years?
Yes — the calculation uses real calendar dates, so leap years are handled automatically.