Age Calculator
Work out an exact age in years, months and days.
Private by design. This tool runs entirely in your browser. Your input is processed on your own device and is not uploaded by DO101.
About the Age Calculator
Enter a date of birth and DO101 works out the exact age today, or on any date you choose, down to the day. It also shows total months, weeks, days and the countdown to the next birthday.
How to use it
- 1Enter the date of birth.
- 2Leave the second date as today, or pick another date.
- 3Read the exact age and the extra breakdowns.
What you get
- Exact years, months and days
- Totals in months, weeks, days, hours and minutes
- Days until the next birthday
- Day of the week you were born
- Calculated locally
Frequently asked questions
How is an exact age calculated?
DO101 counts whole years first, then whole months from that anniversary, then the remaining days — the same way you would say it out loud. Calendar month lengths and leap years are handled properly.
Why does the day count differ from other calculators?
Some tools approximate a month as 30 days. DO101 uses the real calendar, so February and 31-day months are counted correctly.
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