Age Calculator
Calculate exact age in years, months, and days from a date of birth.
How to use the Age Calculator
Enter your values and pick a mode if the tool offers one.
Click calculate — results appear instantly, computed in your browser.
Copy the result or save the tool to your favorites.
Frequently asked questions
It counts complete years, then remaining months, then remaining days from your date of birth to today.
Your device’s current date, read in your browser.
Yes — month lengths are taken from the actual calendar, including February in leap years.
This version uses today. For a specific target date, use the date difference calculator.
No. It is used only in your browser and never sent anywhere.
About the Age Calculator
This calculator finds an exact age from a date of birth, breaking it down into completed years, months, and days as of today. Rather than a rough number of years, it gives the precise interval, which is useful for forms, eligibility checks, and simply satisfying curiosity about an exact age.
How exact age is calculated
The calculation counts full years first, then the remaining whole months, then the leftover days. It does this by comparing the day, month, and year of the birth date against today's date and borrowing across units where needed, exactly as you would by hand. When the current day of the month is earlier than the birth day, it borrows days from the previous month, using that month's real length, which is why the result accounts correctly for months of different lengths.
Leap years and calendar accuracy
Because the calculation reads actual month lengths from the calendar, it handles leap years correctly, including February's extra day in leap years. This matters for people born on or near the end of February and for any calculation spanning many years, where ignoring leap days would slowly introduce errors. The result reflects the true calendar interval rather than an approximation based on a fixed 365-day year.
Common uses
Exact age is needed for school admissions, where eligibility often depends on age as of a specific cut-off date; for legal and official thresholds; for medical contexts where age in months matters for infants; and for working out precise anniversaries or milestones. It is also handy for calculating the age of an object, account, or event, not just a person.
What it uses as today
The calculator reads your device's current date as the reference point, so the age is correct as of the moment you use it. If you need the age at a different reference date, such as a future eligibility cut-off or a past event, you would calculate the interval to that specific date instead, which a date difference tool handles.
Privacy and tips
Your date of birth is used only within your browser to compute the result and is never sent anywhere or saved. Enter the birth date using the date picker to avoid format confusion between day-first and month-first conventions. For converting dates between formats see the Date Converter, and for time-based calculations the Timestamp Converter. The calculation is instant and entirely private.