Age Calculator
Enter your date of birth to calculate your exact age in years, months and days.
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How Age Is Calculated
Your age is the elapsed time between your date of birth and today, expressed in full years, then remaining months, then remaining days. The calculation accounts for leap years and different month lengths automatically.
Age Formula
Age = Today − Date of Birth (in calendar years, months and days)
Example
Born on 1990-01-01, calculated on 2026-07-11:
- 36 years, 6 months, 10 days
More Tools
Use Age Difference mode to compare two birth dates, or Birthday Countdown to see how many days remain until your next birthday.
Frequently Asked Questions
Exact age counts full calendar years since birth, then remaining months, then remaining days, automatically handling leap years and month lengths.
If you were born on January 1, 1990, you are 36 years old as of 2026. Enter your exact birth date for a precise result in years, months and days.
Use the Birthday Countdown mode: enter your date of birth and the calculator shows the date, weekday and days remaining until your next birthday.
Embed this tool on your website
Free to use — copy this code onto your site. It stays up to date automatically and includes a link back to CalcSun.