CALCULATORS
Age Calculator
Calculate a calendar age in years, months and days. Choose a date of birth and optionally change the date to calculate age on.
Enter a date of birth to calculate the age.
Calculated instantly in your browser. Your dates are not uploaded.
How to calculate age
Enter a date of birth to see the age on today's date. Change “Age on” to calculate age on another date, including a date in the past. The result is shown as complete calendar years, months and remaining days, along with the total number of elapsed calendar days.
Calendar month and leap-year handling
Age is calculated using calendar anniversaries, not by dividing elapsed days by an average year length. If a month does not have the original day number, its last day is used for that month's anniversary. This means a February 29 birthday reaches its yearly anniversary on February 28 in a non-leap year.
Examples
- A person born on January 15, 2000 is 24 on January 15, 2024.
- A person born on January 31 reaches one calendar month on February 28 in a non-leap year.
- A February 29 birthday has a February 28 anniversary in a non-leap year.
Find the number of days between two dates with the Date Calculator, or calculate a birthday-related BMI estimate with the BMI Calculator.