About the age calculator
Work out an exact age from a date of birth, in years, months and days, plus the total days, weeks and months lived. It also shows the weekday you were born on and counts down to the next birthday. Change the “as of” date to find an age on any past or future day. It runs in your browser.
How to use it
- Enter the date of birth.
- Leave “Age as of” on today, or pick another date.
- Read the exact age and the totals below.
- Check the next birthday row for the date and days remaining.
Questions
- How do I calculate my exact age?
- Count the full years since your birth date, then the full months since your last birthday, then the days left over. The calculator does this for you and handles month lengths and leap years.
- How is age calculated for someone born on February 29?
- In years without a February 29, this calculator treats February 28 as the birthday. Some laws use March 1 instead, so check local rules if the exact day matters legally.
- What day of the week was I born?
- Enter your date of birth and the “Born on a” row shows the weekday.
- How many days old am I?
- The Total days row shows the number of days from your birth date to the “as of” date, counting leap days.