Age calculator
Find your exact age on any date, down to the day.
Pick a date of birth to see the exact age.
Next: Date calculator · Unit converter
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How to use Age calculator
Enter a date of birth
Pick the date with the calendar or type it in. Today is used as the date to measure to.
Change the date if you like
Pick another “age on” date to see how old someone was or will be, then press Use today to go back.
Read or copy the age
The age appears as you pick, with totals in months, weeks, days and hours. Copy age puts it on your clipboard.
Why use Utils365
Exact to the day
Whole years first, then whole months, then the days left over, the same way people count ages by hand.
More than one answer
See the same age as total months, weeks, days and hours, the date of your next birthday and the weekday you were born.
Leap-day birthdays handled
For a 29 February birthday, choose whether it counts on 1 March or 28 February in other years.
Private by design
The dates never leave your browser, so nothing about your birthday is stored or sent anywhere.
Frequently asked questions
How is age calculated?
Count the whole years since the date of birth, then the whole months since the last birthday, then the days since that month mark. Someone born on 15 May 1990 is 36 years, 5 months and 16 days old on 31 October 2026.
How many days old am I?
Subtract the date of birth from today and count every day in between. The calculator shows this as In days, and also in weeks and approximate hours.
Why are the hours approximate?
The count runs from midnight to midnight, because the time you were born isn’t known. Your real age in hours can be up to a day more or less.
When is a 29 February birthday in other years?
This calculator uses 1 March by default, which is how the law counts it in places such as Hong Kong and Germany. Some people celebrate on 28 February instead, so you can pick that option.
How many days until my next birthday?
Find the next date your birthday falls on, today or later, and count the days to it. On your birthday itself it shows today.
Can I find someone’s age on a past or future date?
Yes. Change the age on date to any day after the date of birth, for example to see how old someone will be at a wedding or was when a photo was taken.