Age Calculator

Enter a date of birth to see the exact age in years, months and days, the total days lived and the next birthday.

Calculate exact age from a date of birth.

How age is calculated

Your age is the time between your date of birth and a second date, usually today. This age calculator counts complete years first, then the remaining months and days. For example, someone born on June 15, 1990 is 36 years, 4 months and 5 days old on October 20, 2026, which is 13,276 days in total. It also shows your age in months and weeks, the days left until your next birthday and the day of the week you were born.

Good to know

  • Age on another date: enter a past or future date in the second field to find out how old someone was or will be on that day.
  • Leap-day birthdays (February 29) are counted on March 1 in non-leap years by this calculator’s date arithmetic.
  • Legal and official ages (for example for retirement, school or insurance) follow each program’s own rules.

For other date math, see the date calculator and the business days calculator.

How to use the age calculator

  1. Enter the date of birth.
  2. Optionally enter another date to calculate the age on that day; leave it empty for today.
  3. Read the age in years, months and days, the total days and the days to the next birthday.

Frequently asked questions

How do I calculate my age?

Subtract your birth date from today’s date: count the full years, then the remaining months and days. The calculator above does this instantly.

How many days old am I?

Enter your date of birth and the calculator shows the total number of days between that date and today.

Can I calculate age on a future date?

Yes. Enter the future date in the second field to see how old you will be on that day.

When is my next birthday?

The calculator shows the number of days left until your next birthday.

Does it work for any date of birth?

Yes, for any date of birth that is before the date you are calculating to.

Related tools: Date calculator · Business days calculator · Percentage calculator

← All tools