Age Calculator
Find your exact age in years, months and days on any date, how many days you have lived, the day of the week you were born, and when your next birthday is.
How to calculate your age
- Enter your date of birth.
- Leave the second date as today, or set any date to see your age then.
- Read your exact age plus days lived and the countdown to your next birthday.
Features
Exact to the day
Years, months and days, handling leap years and month lengths correctly.
Birthday countdown
Days until your next birthday and the weekday it falls on.
Live results
Numbers update the moment you change an input.
Private
Everything is calculated in your browser; nothing is sent anywhere.
Frequently asked questions
How is age in years, months and days calculated?
Whole years are counted first, then whole months, then the remaining days, the same way people state their age. Month lengths and leap years are respected, so 31 January to 1 March is 1 month and 1 day.
What if I was born on 29 February?
In non-leap years your birthday is treated as falling on 1 March for the countdown, which is the convention most countries use legally.
Can I calculate someone’s age at a past or future date?
Yes. Set the second date to any day, for example the date of an event, to see the age on that day.
Is my date of birth stored?
No. The calculation runs in your browser and nothing is saved or transmitted.