Calculators
Calculate your exact age in years, months, and days, plus a countdown to your next birthday. Everything runs locally in your browser.
FAQ
The calculator compares the birth date to the "as of" date and works out full years, then full months, then remaining days — borrowing a month or year when the day-of-month or month is smaller, the same way people naturally count age.
Yes. Set the "as of" date to any past or future date to check age for eligibility rules, legal age requirements, or historical records.
Yes. Total days and next-birthday countdowns account for leap years, and birthdays on February 29 correctly fall back to February 28 in non-leap years.