Age Calculator
Calculate age from a date of birth.
Calculate age from a date of birth.
Age details
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Tool guide
Free Online Age Calculator
Calculate whole calendar years from a birth date to a chosen as-of date. The result also shows the next birthday and the number of calendar days remaining until it.
Steps
How it works
- Enter the birth date.
- Choose the as-of date for the calculation.
- Calculate the age in completed years.
- Review, copy, or download the next-birthday details.
Highlights
Key features
- Calculates completed age in whole calendar years.
- Uses a selectable reference date rather than forcing today's date.
- Rejects an as-of date earlier than the birth date.
- Shows the next birthday date.
- Reports calendar days until the next birthday.
Use cases
Common uses
- Find a person's age on a particular date.
- Check completed years for a past or future reference date.
- See when the next birthday occurs.
- Count the calendar days remaining until a birthday.
Notes
Limitations to know
- This calculator reports whole years, not a years-months-days breakdown.
- Birth time, hours, minutes, and live updating are not supported.
- February 29 birthdays follow browser date rollover when constructing a birthday in a non-leap year.
- Calculations use date-only values in the browser's local calendar.
- The result is not a legal-age determination for every jurisdiction.
FAQ
Frequently asked questions
Is age always calculated as of today?
No. The As of date is selectable and defaults to the current date when the tool opens or is cleared.
Does it show years, months, and days?
No. It reports completed years, the next birthday, and days until that birthday.
Can I enter a future birth date?
The calculation rejects any birth date later than the selected as-of date.
How are February 29 birthdays handled?
The next birthday uses browser calendar rollover when the reference year does not contain February 29.
What is the difference from Exact Age Calculator?
Age Calculator focuses on completed years and the next birthday. Exact Age Calculator adds calendar components and elapsed-time units.