Age Calculator
Enter a date of birth to get the exact age in years, months and days, on today’s date or any other.
Age
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- Total months
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- Total weeks
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- Total days
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- Born on a
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- Next birthday
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How to calculate age from a date of birth
Count the full years since the birth date, then the full months since the last birthday, then the days left over. The calculator does this for you, including leap years and months of different lengths, and also shows the total in months, weeks and days.
Frequently asked questions
How is the exact age calculated?
Whole months are counted from the birth date first, then the remaining days. Someone born on 31 January turns one month old on the last day of February.
What about birthdays on 29 February?
In years without 29 February, the calculator treats 28 February as the birthday. Some countries use 1 March legally, so check local rules for official purposes.
Can I calculate age on a past or future date?
Yes. Change the “Age on” date to find someone’s age on any day, for example on a deadline or an event date.