Age Calculator

Your exact age in years, months and days.

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Date of birth–

How to use this calculator

1 Pick a date of birth; the exact age as of today appears immediately.
2 The result is broken down into full years, remaining months and remaining days, the way official forms usually ask for it.
3 Below the age you also see the total number of days lived and how many days remain until the next birthday.
4 It works for anything with a start date: a company's age, a contract's runtime, or how old your pet is.

How is age in years, months and days calculated?: Full calendar years are counted first, then full months, then the remaining days. Someone born on 15 March is exactly X years and 0 days old on 15 March.
What about a February 29 birthday?: In non-leap years, the age rolls over on 1 March, since that is the first day after 28 February. The day count itself is always exact.
Is the age calculated for today?: Yes, the reference is today's date on your device. Every time you open the page, the result is current.
Why does my age differ from the 'days divided by 365' shortcut?: Because of leap years: a calendar year is on average 365.25 days. This calculator uses real calendar dates, so the result matches how birthdays actually fall.

Count days between dates, or jump a number of days ahead.

The date a set number of days ahead, and the same distance back.

Body mass index from height and weight.