Age Calculator
Enter your date of birth to find out your exact age in years, months, and days — plus total months, weeks, and days lived.
Calculated locally in your browser.
How to use
- Enter your date of birth — type or use the date picker.
- Set the “as of” date — defaults to today, but you can calculate your age on any date.
- The result shows your age in years, months, and days, plus totals in months, weeks, and days.
Example
- Date of birth: January 15, 2000
- As of: September 18, 2026
- Result: 26 years, 8 months, 3 days
How age is calculated
- Years — counted from birthday to birthday.
- Months — remaining months after full years.
- Days — remaining days after full months. Month lengths (including leap years) are accounted for exactly.
Leap year birthdays
If you were born on February 29, the calculator handles this correctly for any target year, including non-leap years.
FAQ
- Does it use my timezone? Yes — all dates are calculated using your browser's local date, not server time.
- Can I calculate a future age? Yes — set the “as of” date to any future date to see what your age will be.
- What if I enter a future birth date? The calculator shows a clear validation message rather than a negative age.
- Is my data sent anywhere? No — all calculations run locally in your browser. Nothing is sent to a server.