How to use this age calculator
- Enter your date of birth.
- Optionally change the "Age on date" to calculate your age on a specific date instead of today.
- View your exact age in years, months, and days along with total days, weeks, months, and next birthday countdown.
How is age calculated?
The calculator finds the difference between your birth date and the target date:
- Years — complete years from birthday to target date.
- Months — remaining complete months after full years.
- Days — remaining days after full months.
Leap years and varying month lengths (28, 29, 30, 31 days) are all handled correctly.
FAQ
What if I was born on February 29?
Your age is calculated correctly. In non-leap years, your birthday is treated as March 1 for age calculation purposes, which is the standard legal convention in most countries.
Does this include the birth date in the count?
The birth day itself is day 0. If you were born on Jan 1 and today is Jan 2, you are 1 day old. This follows the standard convention.
Can I calculate age on a past date?
Yes. Change the "Age on date" field to any date — past or future — to see how old you were or will be on that date.