Age Calculator
Enter your date of birth to see your exact age down to the day.
| Total months | |
| Total weeks | |
| Total days | |
| Total hours |
How your exact age is calculated
Your age in years, months, and days is worked out by comparing your date of birth to today (or any date you choose). The calculator counts full years first, then the leftover months, then the remaining days — accounting for months of different lengths and leap years.
Why total days can differ from age × 365
Leap years add an extra day every four years, so multiplying your age by 365 undercounts. This tool counts the real number of days between the two dates instead.
Frequently asked questions
How do I calculate my exact age?
Subtract your birth date from today's date, counting full years, then remaining months, then remaining days. This calculator does it automatically when you enter your date of birth.
How many days old am I?
Enter your date of birth above and the calculator shows your total age in days, weeks, and hours, counting leap years correctly.