What do the “days” in the result mean?

Days are the remainder after full months, not total lifetime days. For a single day count between two dates, use the days-between calculator.

How do I count days until my next birthday?

This tool measures elapsed age, not a future countdown. Put today and your next birthday into days-between or the countdown-to-date tool.

Why isn’t subtracting the years enough?

Calendar-year subtraction doesn’t show whether this year’s birthday has already passed. Month and day move the boundary — that’s why the result is years, months, and days.

Does the calculator account for leap years?

Yes. When the range crosses 29 February in a leap year, month and day remainders follow the real calendar.

Age Calculator

Calculate exact age in years, months and days

Date of birth

As of date

Defaults to today. Change it to see age on another date.

Enter a date of birth, then calculate.

Methodology

Age from birth date to selected date

Frequently asked questions

Enter your date of birth and optionally an as-of date (usually today). The tool counts full years, then remaining months and days on a real calendar, including leap-year Februaries.

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