Calculate age in years, months and days from a date of birth to today or a chosen date.
Try an example
Load a ready-made sample into this tool and run it. Every result you see is calculated live by the tool itself — nothing here is a pre-written answer.
Sample: dob: 1990-05-15; asof: 2026-10-28
How to Use
- Pick a date of birth.
- Optionally pick an “as of” date; today is used otherwise.
- Read the age in years, months and days.
What this age calculator does
This age calculator works out an exact age from a date of birth, expressed in years, months and days rather than a rounded number of years. Enter a birth date and the age is calculated to today, or pick a different “as of” date to find the age on a past or future day. That precision helps with forms, school or sports cutoffs, anniversaries and eligibility checks that turn on a specific date.
How the age is counted
The calculator counts complete calendar years first, then complete calendar months, then the remaining days, so the result is exact to the day. Because it uses real calendar months rather than an average month length, the result matches how ages are normally stated. Someone whose birthday falls late in a month therefore reaches each month milestone on the calendar date itself, not on an averaged estimate.
Good to know
The result is a calendar calculation only, not a legal age check. Official age can depend on local rules — for example, the time of birth or the moment a law treats someone as reaching an age — so confirm important eligibility decisions against the rules that apply in your case rather than relying on this figure alone.
Frequently asked questions
Can I calculate an age for a date other than today?
Yes. Pick an “as of” date alongside the birth date and the age is calculated to that day instead. Left unset, it uses today’s date, which suits everyday checks.
Why is the age given in years, months and days?
A whole-years figure hides the remainder, which matters near a birthday or cutoff date. Months and days show the exact elapsed time, so you can see how close someone is to the next milestone.
Is this an official legal age verification?
No. It is a plain calendar calculation from the dates you enter. Legal age can involve extra rules set by governments, schools or organizations, so treat the result as a planning figure, not proof.
How to use Age Calculator
- Pick a date of birth.
- Optionally pick an “as of” date; today is used otherwise.
- Read the age in years, months and days.
Limitations
Age uses calendar months, not an average month length, and is a calendar calculation only, not a legal age check.