Compute exact age between two dates with detailed calendar-based breakdowns.
Overview
The Age Calculator determines exact age from a birth date to today or any target date using calendar-accurate year and month boundaries.
It can also show total days lived and other useful time units for forms, planning, and milestone tracking.
For legal eligibility, school enrollment, or benefits, confirm requirements with official documents rather than online estimates alone.
Steps
Provide your date of birth in the input field.
Use today or choose a custom date for comparison.
Compute age with years, months, and days output.
Check total elapsed days for precise records.
View optional outputs in weeks, hours, or minutes.
Math
Age = difference between target date and birth date using calendar year/month/day rules
The calculator counts full years first, then full months, then remaining days, adjusting for month lengths and leap years.
Worked cases
Exact calendar difference
26 years, 0 months, 0 days
Calendar difference with incomplete current year
30 years, 7 months, 13 days
Count elapsed days including leap days
5,844 days
Why use this
Questions