About this tool
Calculate exact age in years, months and days from a date of birth.
The Age Calculator computes your exact age from a date of birth to today (or any target date). The result is shown in years, months and days — not just years. It correctly accounts for leap years and month-length variations. Useful for filling in forms, health screenings, legal documents and age-verification checks.
Example
DOB: 1990-06-15 · Today: 2026-06-10 → 35 years, 11 months, 26 days
How to use
- Enter your date of birth.
- Optionally change the target date (defaults to today).
- Exact age in years, months and days appears instantly.
- Check the next birthday countdown below.
Features
- Years, months and days result
- Accounts for leap years
- Custom target date
- Next birthday countdown
- Works for any historical date
Frequently Asked Questions
How is the exact age calculated?+
The tool counts complete calendar years, then complete months, then remaining days — handling variable month lengths and leap years correctly.
Can I calculate age on a specific past or future date?+
Yes. Change the target date from "today" to any date and the age is recalculated.
What is the oldest date supported?+
Any valid Gregorian calendar date. The Gregorian calendar is well-defined back to 1582.
Does it count leap year birthdays correctly?+
Yes. If you were born on February 29, the calculator handles the birthday correctly in non-leap years.
Does it account for leap years?+
Yes. The calculation is date-based, so leap-day birthdays (29 February) are handled correctly.
Can I calculate the age of a business or historical event?+
Yes. Enter any past date. The tool works for any date from 1900 onwards.