Age Calculator
Enter a date of birth to get an exact age in years, months and days — as of today or any other date — along with the total days lived and a countdown to the next birthday.
Runs in your browser
How to use
- Enter the date of birth.
- Change the reference date if you need the age on a specific day.
- Read the age and the extra details.
How it works
Age is counted in calendar units, the way people and official documents do it: whole years first, then whole months, then remaining days. If the day of the month hasn't been reached yet, a month is borrowed and the days of the previous month are added.
People born on 29 February celebrate on 1 March in non-leap years in this calculation.
Examples
- Born 15 May 1990
- On 18 September 2026: 36 years, 4 months, 3 days.
Common uses
- Checking eligibility ages for forms
- Counting days until a birthday
- Genealogy and history
Privacy & security
This tool runs entirely in your browser. Your files and text are never uploaded to our servers — processing happens on your device and results are created locally. How each tool handles files
Frequently asked questions
Is my data stored?
No. The calculation runs in your browser and nothing is saved.
Why do some sites give a different number of days?
They may include the end date or use 30-day months. This tool uses the real calendar.
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