Date calculator
Age Calculator.
Calculate exact age in years, months, and days
Date math depth
How this age calculator page differs
Each calculator type uses the same interactive shell, so the page adds type-specific examples, edge cases, and canonical boundaries to avoid becoming a duplicate utility surface.
Best use case
Best for exact age in years, months, and days from a birth date or anniversary date.
Worked example
A March 15 birthday checked on March 13 has not reached the next full year yet, so the result stays one year lower until March 15.
Edge cases this page calls out
February 29 birthdays depend on the calendar date being checked · Partial months are not rounded up · For live birthday countdowns, use the richer age-calculator tool
Richer companion route
The dedicated age tool adds live seconds, next-birthday countdown, and milestone dates. This page stays indexable as the lightweight date-calculator variant, while the companion route handles deeper interactive intent.
Calculations are deterministic calendar math. User-entered dates stay in the browser component and are not turned into crawlable pages or structured data.
Age calculator
The dedicated age tool adds live seconds, next-birthday countdown, and milestone dates.
Open Age calculator →Popular countdowns
Public holidays by country
FAQ
How is the exact age calculated?▾
Age is computed as full years since birth, then remaining full months, then remaining days. A person born on March 15, 1990 is 35 years, 11 months, and 28 days old on March 13, 2026.