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Age Calculator
Enter a date of birth to see your exact age in years, months and days, your total days lived, your next birthday and the weekday you were born.
Enter a date of birth to see the age.
How the age is worked out
- Count whole years from the date of birth to the chosen date.
- From that anniversary, count whole months.
- Count the days left after the last whole month.
Months have different lengths, so the day count is taken from the date a whole number of months after the birth date, not from a fixed 30 days. The method is explained in the guide to counting days between dates.
Total days, weeks and months
The table under the result gives the same age as a single count of months, weeks and days. Total days is the exact number of calendar days from the birth date, with leap days included.
Frequently asked questions
How is age calculated in years, months and days?
Whole calendar years are counted from the date of birth, then whole months, then the remaining days. Someone born on 15 May 1990 is, on 4 November 2026, 36 years, 5 months and 20 days old.
Does the day of birth count?
The age is measured from the birth date to the chosen date, so the birth date itself is day zero. You turn a year older on your birthday, not the day after.
How is a 29 February birthday handled?
In years that are not leap years, this calculator treats 28 February as the anniversary. Some countries legally use 1 March instead, so for legal purposes check the rule that applies to you.
Can I find my age on a past or future date?
Yes. Change the Age on date. It starts as today, but you can set any date after the date of birth.
Is my date of birth stored or sent anywhere?
No. The calculation runs in your browser and nothing is uploaded.