Enter any birth date to see your age in years, months and days, plus total weeks, days, hours and the next birthday countdown.
Calendar math is harder than it looks, leap years and month lengths trip up most calculators. Ours uses the standard date library that powers banks and accounting software.
Leap years, varying month lengths and time zones make manual age math unreliable. Someone born on 29 February has edge cases in non-leap years. An age calculator accounts for calendar rules automatically.
School admissions, insurance forms, visa applications and sports age brackets often require age as of a specific date, not today. Use this tool to verify eligibility before you submit official paperwork.
Yes. People born on February 29th have their age incremented on March 1st in non-leap years, matching the legal convention in most countries.
We count the start date as day 0 (you were 0 days old at birth). Some calculators count day 1, which is why answers can differ by one.
Set the 'as of' date to the other person's date of birth and the result is their age relative to the first person.
Ages are calculated against local midnight. Time zones only matter on the day of birth and the day of the calculation.