Age calculator
Calculate years, months and days on a date you choose, together with the total number of calendar days since birth.
Ready when you are.
Inputs stay in your browser. Results use the displayed formula and are rounded only for display. Uses month anniversaries clamped to the last day of shorter months. This is a calendar convention, not an official eligibility rule.
How to use this tool
- Enter the date of birth.
- Enter the date on which you need the age.
- Review completed years, months and remaining days.
Frequently asked questions
What about 29 February birthdays?
In a non-leap year, this calculator uses 28 February as the clamped anniversary. An institution may apply a different rule.
Can I use this for admission eligibility?
Compare your birth date directly with the institution’s official eligibility window. This calculator does not establish eligibility.
How are months counted?
Completed calendar month anniversaries are counted first, then the remaining days. Short months use their last day where needed.