Age Calculator
Work out an exact age in years, months and days, plus totals and the countdown to the next birthday.
36 years, 4 months, 23 days
Born on a Thursday
36
Years
4
Months
23
Days
436
Total months
1899
Total weeks
13295
Total days
319,080
Total hours
19,144,800
Total minutes
Next birthday on 2027-05-17 — that is 219 days away, and it will be number 37.
What does this tool do?
Works out the age between two dates: years, months and days exactly, plus the totals in months, weeks, days, hours and minutes, the weekday of the birth date, and when the next birthday is.
Why “years, months and days” is not a subtraction
An age in months and days depends on how long the months in between were, and they are not all the same length. Going from 15 January to 1 March is one month and fourteen days if you borrow from February. The tool does that borrowing properly, which is the only reason the result matches what a registry office or an insurance form expects.
The next birthday
The countdown points to the next time that date comes round: this year if it has not happened yet, next year if it has. Someone born on 29 February will see 1 March in the years that are not leap years, which is the convention most legal systems use. And if today is the birthday, the countdown reads zero rather than a year.
Keep in mind
Dates are handled in UTC, so the result does not shift by a day depending on the time zone you are in. Nothing is sent anywhere: the whole calculation happens in your browser.