Age Calculator

Age Calculator

Exact age calculation

An exact age is more than the difference between two years. The calculator compares the birth date with the target date and adjusts for whether the birthday has already happened in that target year.

For example, someone born on September 10, 2000 is 25 on September 10, 2025, but still 24 on September 9, 2025. Month and day handling matters when filling forms, checking eligibility, or counting anniversaries.

Days, months, and leap years

Total days can differ from a simple year count because leap years add extra days. People born on February 29 may also need special interpretation depending on the rule used by a school, employer, or government form.

When it helps

Use this calculator for birthdays, application deadlines, age-on-date questions, project timelines, and quick date checks where the exact day matters.