Age Calculator – Find Your Exact Age in Years, Months & Days

Enter your date of birth and a target date (or leave it as today). The calculator subtracts the birth date from the target date using calendar rules that account for leap years and varying month lengths. It then breaks the result into years, months, and days — plus weeks, hours, minutes, and seconds if you include the time.

Yes. The calculator counts every leap year between your birth date and target date. It correctly handles February 29 — so if you were born on a leap day, your age is calculated using February 28 or March 1 in non-leap years as appropriate.

Yes. Set the target date to any date up to the year 2099. The calculator works for both past and future dates — useful for planning milestones, birthday countdowns, or determining eligibility on a future date.

The calculator identifies the first occurrence of your birth month and day after the target date and counts the days until that date. This is useful for tracking how many days remain until your next birthday celebration or age milestone.

The precise breakdown is helpful for legal documents that require an exact age at a specific time, for medical records, actuarial calculations, or simply for personal curiosity. Activating the time option gives you granularity down to the second.

The calculator shows your completed age — meaning the number of full years, months, and days that have already passed. For example, if you were born on January 15, 1990 and today is June 30, 2026, you have completed 36 years, 5 months, and 15 days of life. You are in your 37th year, but your completed age is 36.