How old are you, exactly — not just in years, but in months and days too? Enter your date of birth and this calculator works out your precise age using real calendar arithmetic (actual month lengths, leap years included). You can also pick any "as of" date to find someone's age on a past or future date, handy for eligibility checks and forms.
Leave empty to use today's date.
Your results appear here
Fill in the values and the math updates instantly.
Age is counted the way birthdays work: complete years first, then complete months, then leftover days — borrowing from the previous month (with its real length) when the day-of-month hasn't arrived yet.
Age = full years + full months + remaining days
All math runs in UTC on calendar dates, so timezones can't shift your birthday by a day. Leap years are handled naturally because February's real length is used every time.
Born 15 Jan 2000, age on 6 Oct 2026:
Your age is the exact calendar age — the number you'd state on a form. Total days lived counts every day since birth, leap days included. Next birthday is the upcoming anniversary of your birth date (29 February birthdays are shown on 28 February in non-leap years).
For eligibility (government exams, licences, retirement), what matters is the age on the cut-off date — set "calculate age as of" to that date rather than today.
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Content last reviewed on 2026-10-06.