Age calculator
Enter a date of birth. The age updates instantly.
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- Total months
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- Total weeks
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- Total days
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- Next birthday
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How age is calculated
The calculator counts whole years since the date of birth, then the whole months since the last birthday, then the remaining days. That's the same way age is worked out on official forms, so a person born on 15 March is one year older on each 15 March.
Change the "age on this date" field to find out how old someone was, or will be, on any date: the day they started school, a wedding, or a future retirement date.
Leap year birthdays
If you were born on 29 February, this calculator counts your birthday as 28 February in years without a 29th. Some countries use 1 March for legal purposes instead.
Questions people ask
How do I calculate my exact age?
Count the full years since your birthday, then the full months since your last birthday, then the days left over. This calculator does all three instantly.
How many days old am I?
Enter your date of birth and the total days figure shows how many days you've been alive as of today.
Can I calculate age on a past or future date?
Yes. Change the age on this date field to any date to see the age at that moment.
What day of the week was I born?
Enter your date of birth and the answer appears under your age.