Your age is
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Total days
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Next birthday in
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Enter your date of birth for your exact age, next birthday countdown, and the day you were born.
Your age in years is the number of full years between your birth date and today, but an exact age also counts the leftover months and days. The calculation is not simply today's year minus your birth year: if your birthday has not happened yet this year, you are still a year younger. The calculator above works out your precise age in years, months and days, and accounts for the varying lengths of months.
Leap years and edge cases. Because a leap year adds a day every four years, exact day counts have to account for them, which is why a reliable calculator does the date maths rather than approximating a year as 365 days. People born on 29 February are a special case, usually marking their birthday on 28 February or 1 March in common years.
Why it is useful. Precise age matters for things like medication dosing, pension and benefit eligibility, age-gated milestones, and simply working out age gaps or how long until a birthday. You can also use the same date maths to find the number of days you have been alive, which is a fun figure.