Calculate exact age in years, months, days, hours, minutes, and seconds — from any birthdate, to any reference date.
Calculate age
Tip: Set "as of" to a future date to calculate age at a future moment — useful for school enrollment, visa applications, and retirement planning.
Age
— years
—
Total months0
Total weeks0
Total days0
Total hours0
Total minutes0
Next birthday in—
What this calculator is for
The Age Calculator computes exact elapsed time from a birthdate (or any past date) to a reference date. It's used for:
School enrollment — many districts have age cutoffs (e.g., "must be 5 by September 1")
Visa and immigration — age requirements for dependent visas and citizenship
Retirement planning — exact age at planned retirement date
Insurance and pensions — premium calculations based on age in years and months
Legal milestones — voting age, drinking age, age of majority
Birthday countdowns — days until the next one
Questions, answered
Things people actually ask.
Enter a birthdate and the calculator computes exact age in years, months, days, hours, minutes, and seconds, using calendar math. By default it computes against today, but you can change the 'as of' date for retrospective calculations.
Yes. The calculator uses real calendar dates, so February 29 birthdays are handled correctly and leap-year day counts are accurate.
Some systems count age as 'years completed' (the standard Western way), others as 'years entered' (some East Asian traditions add a year at birth and another at New Year). This calculator uses the Western 'completed years' method.