How age is calculated
Your age in years, months and days is worked out by counting full calendar months and the remaining days, exactly the way you would say it out loud. Leap years and varying month lengths are handled automatically, so the result matches your real birthday rather than a rough days-divided-by-365 estimate.
Private by design. Your birthday stays in your browser and is never uploaded.
Frequently asked questions
How is my exact age worked out?
It counts whole years and months from your birth date to the chosen date, then the leftover days, handling leap years and different month lengths automatically.
Can I calculate age on a future or past date?
Yes. Change the second date field to any date and the age is calculated as of that day.
Is my birthday uploaded?
No. Everything is calculated locally in your browser.
More free tools
Date tools: Days Between Dates, Countdown Timer, Time Duration Calculator · See all Alienated Tools.