How it counts
age in days = count-to date − date of birthyears and months follow the calendar
- date of birth
- the starting date
- count to
- the date to measure the age at
- days old
- exact calendar days lived
The years figure is the completed age; the months and days show how far into the next year you are.
Frequently asked questions
How do I find how many days old I am?
Enter your date of birth and leave the second date as today; the tool shows your age in days, weeks, months and years.
Does it include leap days?
Yes. The day count is exact calendar days, so every February 29 you have lived through is already counted.
Can I find my age on a future date?
Yes. Set the second date to any future day to see how old you will be then.
Why does the age in months not match days ÷ 30?
Because months vary in length, so the calendar count differs slightly from a fixed 30-day month.