Age Calculator
Find your exact age in years, months, and days. See your next birthday countdown.
Age Calculator
How to Use
- Enter a date of birth using the date picker.
- The "as of" date defaults to today — change it to calculate age at any point in time.
- Age is shown in years/months/days and as total days, weeks, and months.
- Scroll down for the next birthday countdown.
Frequently Asked Questions
QHow is age calculated exactly?
Age is calculated by counting full calendar years, then remaining full months, then remaining days from the last month. The same method used on official documents.
QCan I calculate age at a past or future date?
Yes — change the "as of" date to any date to find how old someone was or will be on that date.
QWhy does my age in days change each day?
Because the calculation always uses today's date. Each day that passes adds one more day to your total.
About This Calculator
Age is calculated using the Gregorian calendar. Leap years are handled correctly — a person born on 29 Feb has their birthday on 28 Feb in non-leap years for the countdown calculation.