Age Calculator

(1) Year difference; (2) Check if the current month/day has passed the birth month/day — if not, subtract 1 year; (3) Calculate remaining months; (4) Calculate remaining days. Example: born 15 March 1990, today is 1 July 2026 → 36 years, 3 months, 16 days. The calculator handles leap years correctly, including 29 Feb birthdays.

Age in years counts complete calendar years elapsed. Age in days counts total days — for a 36-year-old that's approximately 13,140–13,150 days (36 × 365 + leap year count). Exact count depends on birth date. The calculator shows both — total days is useful for legal age thresholds in some jurisdictions.

(1) Set birthday to same day/month in current year; (2) If already passed this year, add 1 to year; (3) Count days from today to that date. For 29 Feb birthdays, in non-leap years the next birthday is either 28 Feb or 1 March depending on jurisdiction.

Yes — enter any two dates, not just a birth date and today. Use cases: time since a project started, days between events, contract duration, time since a historical date, or days until a future deadline. Results show years, months, days, total hours and total days. Calendar days only — not business days.