Find your exact age in years, months, days — and total days lived.
Enter Dates
Age Result
Born on a Monday · Monday, June 25, 2001
Next Birthday
Friday, June 25, 2027
How it works: Age is calculated using calendar arithmetic — years and months are exact calendar units, and the remaining days are the leftover after subtracting full months. Total days use the precise millisecond difference between dates.
The Age Calculator tells you exactly how old you are — down to the year, month, and day — from any birthdate you enter. It also shows your total days lived, total weeks, total months, approximate total hours, and counts down to your next birthday. Whether you need your precise age for a form, or just want to know how many days you have been alive, this free tool gives you the answer instantly.
Age is computed using calendar arithmetic. Full years are counted first, then full calendar months, and the remaining days are whatever is left over. This matches how age is counted in everyday life — for example, someone born on March 31 turns one month older on April 30, not April 31.
Because calendar years are not all 365 days — leap years have 366. The total days figure uses the precise millisecond difference between your birthdate and the reference date, so it accounts for every leap year in between.
Yes. The "Age As Of" field defaults to today but you can change it to any future or past date. This is useful for legal documents, historical research, or finding out how old someone was on a specific day.
Yes. If you were born on February 29, the calculator uses February 29 as your birthday in leap years and March 1 in non-leap years when computing your next birthday, matching the most common legal convention.