Age Calculator
Calculate your exact age in years, months and days from your date of birth. Free, fast and private.
Your result will appear here.
Formula: age is counted in full calendar years, then remaining months and days, from your date of birth to the chosen date.
How to use Age Calculator
- Pick your date of birth from the calendar.
- Optionally pick a different 'as of' date — leave it blank to use today.
- Click Calculate Age to see your age in years, months and days, plus the total in days and weeks.
Note: this tool runs in your browser. Nothing is uploaded.
Frequently Asked Questions
How is age calculated?
Age is counted in full calendar years from your date of birth, then the remaining complete months and days up to the chosen date.
Can I calculate my age on a past or future date?
Yes. Enter any 'as of' date — for example, your age on the day you started a job or will turn 18.
Why does the age in days differ from years × 365?
Because leap years add extra days. This calculator counts actual calendar days between the two dates.
Is this age calculator free?
Yes, it is 100% free with no sign-up. Your data stays in your browser.