Everyday calculators
Age Calculator
Calculate age in years, months, and days from a date of birth.
Calculate an age from a birth date using your device's current date. The result shows completed years plus remaining months and days.
How calendar age is calculated
Age is based on completed calendar anniversaries, not simply the number of days divided by 365. That avoids errors around leap years and different month lengths.
Official age rules can differ
Certain legal, medical, school, or benefit systems may define age or eligibility using specific cutoff dates or rules. Use the relevant authority for official decisions.
Privacy
The calculation runs in your browser. This page does not need to upload the entered date to perform the math.
Frequently asked questions
Does leap day work?Modern browsers handle leap-year dates; official birthday treatment in non-leap years can vary by context.
Can I calculate age on a future date?This version calculates age as of today.