Age Calculator
Calculate your exact age in years, months and days, and find out when your next birthday is.
Key facts
- Age is counted in complete years, then complete months, then the remaining days between the date of birth and the date you choose.
Born on a Tuesday, 20 June 2000
ExampleAge on Thursday, 1 January 2026
25years6months12days
Next birthday: Saturday, 20 June 2026
Coming up
- Turning 26Sat, 20 Jun 2026in 6 months
- 10,000 days oldSat, 6 Nov 2027in 22 months
- Turning 30Thu, 20 Jun 2030in 4.5 years
- Days lived so far9,326
How this works: Method,
How this works
Method
Age is counted in complete years, then complete months, then the remaining days between the date of birth and the date you choose (today by default). When a month is too short for the birth day, the date moves to that month’s last day, and a 29 February birthday counts on 1 March in common years. Totals are whole calendar days, so daylight-saving changes never shift them.
Privacy
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Changes
- Added key facts on how age, leap years and short months are counted.
- Redesigned: separate day, month and year boxes, a ring showing the way to your next birthday, and coming milestones such as 10,000 days old.
- Fixed day counts that could be one off across daylight-saving changes, and ages for birthdays on the 29th to 31st of a month.
- First published.
Frequently Asked Questions
How is age calculated exactly?
Age is calculated by finding the difference between your date of birth and the target date. The calculator counts complete years, then remaining complete months, and finally remaining days. This gives you a precise breakdown like '25 years, 3 months, and 14 days' rather than just a rounded number.
How does the calculator handle leap years?
The calculator correctly accounts for leap years. If you were born on February 29, your birthday in non-leap years is considered to fall on March 1 for age calculation purposes. The total days calculation also correctly includes all leap days that occurred between your birth date and the target date.
Can I calculate my age in different units?
Yes, this calculator provides your age in multiple units simultaneously. In addition to years, months, and days, it shows your total days lived, total weeks, and total months. It also calculates fun statistics like total hours, minutes, and seconds you have been alive.
What is the difference between chronological and biological age?
Chronological age is your actual age based on your date of birth, which is what this calculator measures. Biological age refers to how old your body appears to be based on health markers like fitness level, cellular health, and organ function. Two people with the same chronological age can have very different biological ages depending on lifestyle and genetics.