Age calculator
Get an exact age in years, months and days, and count down to the next birthday.
How to use the age calculator
- Enter the date of birth.
- Optionally change the “age on” date, which defaults to today.
- Read the age and the countdown to the next birthday.
About this tool
Enter a date of birth to get the exact age today, the way you would count it on a calendar: full years, then full months, then days. You can also set a different “as of” date to find someone’s age on a past or future day.
Below the age you will find the total time lived in months, weeks and days, and how long until the next birthday.
Calendar age
Age = full years + full months + remaining days between the two dates
Birthdays on February 29 are treated as March 1 in non-leap years, the convention used by most US agencies.
Example
Someone born on February 29, 2000 is 26 years, 7 months and 22 days old on October 21, 2026.
Frequently asked questions
How do I calculate my exact age?
Count the full years since your birth date, then full months since your last birthday, then the remaining days. The calculator does this automatically.
How is a February 29 birthday handled?
In non-leap years the birthday is counted on March 1, the most common legal convention in the US.
Can I calculate age on a specific date?
Yes. Change the “age on” date to any day in the past or future.
How many days old am I?
The total days lived are shown under the main result.