Age Calculator

Calculate your exact age in years, months, and days from your date of birth.

Enter your date of birth to see your exact age.

How to use age calculator

  1. Enter your date of birth
  2. Choose the date to calculate your age at
  3. Read calendar years, months, days, and next birthday

Worked example

January 31, 2020 to March 1, 2021

1 year, 1 month, 1 day

How the result is calculated

Age is calculated using complete calendar months with short-month clamping, then the remaining days. This avoids negative day components around February. It is date arithmetic, not a determination of legal age rules.

Inputs stay in your browser. You can use this tool without joining the waitlist or creating an account.

From a calculation to a daily glance

Keep that milestone in view.

Save your birthday as a countdown in the app, assign it to Countdown 1 or 2, and add that Lock Screen widget.

  1. 1Create or select your countdown in the app.
  2. 2Choose its widget assignment or a matching style.
  3. 3Add the corresponding Lock Screen widget.
Get early accessExplore widget designs

Web results do not automatically sync to the app. Setup is manual; calendar events appear through your enabled calendars.

Timer Countdown native iPhone preview
Countdown widget · example design from the app

Frequently asked questions

How do I calculate my exact age?
Enter your date of birth and the calculator works out your age down to the day - years, months, and days - based on today's date. You can also set a different 'age at' date to find your age on any past or future day.
How long until my next birthday?
The calculator shows the number of days remaining until your next birthday and the weekday it falls on. To keep that countdown visible every day, the Monthly Calendar Widgets countdown widget can sit on your iPhone Lock Screen.
Is my date of birth stored anywhere?
No. Every calculation runs entirely in your browser. Nothing you type is sent to a server or saved, so your date of birth stays private on your device.

More free calendar tools