Free Online Age Calculator
Find your exact age in years, months, and days—plus your next birthday countdown.
Leave this as today, or choose a future or past date.
Your age is calculated from calendar dates. Leap years and different month lengths are handled automatically.
About the Age Calculator
This age calculator tells you your exact age in years, months, and days on any date. It also shows your age in total months, weeks, days, and hours, plus a countdown to your next birthday.
How age is calculated
Age is counted the way people normally state it: the number of full years since your date of birth, then the remaining full months, then the remaining days. This is different from simply dividing the total number of days by 365.25, which can be off by a few days depending on birthdays and leap years.
Leap year birthdays
If you were born on 29 February, the calculator treats your birthday as 28 February in non-leap years when calculating the countdown. When calculating age in years, it uses the actual calendar, so the result stays consistent with the date you choose.
How to use this calculator
- Enter your date of birth.
- Leave the “Age at date” as today, or choose another date.
- Click Calculate age to see your exact age and totals.
Frequently asked questions
Why is my age in months not exactly years × 12?
Total months counts every full month that has passed since your birth. The years and months in the exact age are the same total expressed as years plus remaining months.
Can I calculate age on a future date?
Yes. Choose a future date to see how old you will be on that day, along with the number of days until then.
Are time zones considered?
No. The calculator compares calendar dates only, so the result is the same regardless of your time zone.