Age Calculator
Enter a birth date to calculate the exact age in years, months and days, with total days, weeks and the next birthday.
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About the Age Calculator
This calculator works out age from a birth date to today, or to any as-of date you choose. It reports the exact calendar age in years, months and days, plus the total number of days, full weeks, full months and the next birthday countdown.
How to use it
- Enter the birth date.
- Leave the as-of date blank to use today, or enter a different date.
- Read the exact age and the totals below the form.
The exact age uses calendar dates, so month lengths and leap years are handled by the browser's date engine. For people born on February 29, the next birthday is shown as February 28 in non-leap years. The dates are processed locally in your browser and are never uploaded.
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Can I calculate age on a past or future date?
Yes. Enter an as-of date to calculate the age on that specific day. Leave it blank to calculate age as of today.
Does the age calculator handle leap years?
Yes. Calendar differences use real month lengths and leap years. February 29 birthdays use February 28 for the next birthday in non-leap years.
What is the difference between exact age and total days?
Exact age is split into calendar years, months and days. Total days is the raw number of full days between the two dates.
Are the dates stored or uploaded?
No. The calculation happens locally in your browser, so the dates you enter never leave your device.