Age Calculator
Enter a date of birth to calculate age today or on another date, including the next birthday and the total days between the dates.
Enter dates
Change the reference date to check your age on any past or future date.
Age
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Next birthday
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Total days
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Read each age result correctly
The main result is your age in completed years on the reference date. The calendar breakdown shows the remaining months and days, while total days measures the full elapsed date range.
The next-birthday result uses the same reference date, so you can check a past or future date without changing your date of birth.
About this tool
Calculate your age from a date of birth and a reference date. Along with your age in completed years, you can see the calendar time in years, months, and days and how long remains until the next birthday.
All calculations happen in your browser. Your date of birth and reference date are not saved or sent to a server.
Frequently asked questions
How is age calculated?
Your age is calculated from your date of birth to the reference date, using the number of whole years that have passed.
Can I calculate age on a past or future date?
Yes. Change the reference date to calculate the age on that date.
How are February 29 birthdays handled?
February 29 is used in leap years. For this general calendar calculation, February 28 is treated as the corresponding birthday in other years. This tool does not provide a legal determination of age.
Is my date of birth saved?
No. The dates you enter are not saved, and the calculation takes place in your browser.
Can I see the days until the next birthday?
Yes. The result shows both the remaining days and the date of the next birthday.
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