What this tool helps you find
Choose a birth date to calculate completed calendar years, months, and days up to today. The page also estimates total elapsed days and the next birthday.
Formula
Age is the calendar difference between the birth date and today.
Worked example
A person born 2000-01-01 turns 26 on 2026-01-01.
Common mistake
The result depends on today’s date and your device calendar. A February 29 birthday in a non-leap year is treated as the next calendar date in March.
When to use it
Find an exact calendar age or count how many days remain until a birthday.
Questions and answers
Does this handle leap-day birthdays?
Yes. The calculation uses calendar dates and handles leap years.
Is my birth date saved?
No. Date calculations happen locally in your browser.