Age Calculator
Free age calculator. Enter a date of birth to see your exact age in years, months, and days, plus the total days, weeks, and months you've lived, calculated live.
An age calculator works out exactly how old someone is — not just in years, but the precise years, months, and days between a date of birth and any other date. Enter a birthday and the result appears instantly; leave the second date blank and it uses today.
It also breaks your age down into total days, weeks, and months lived, which is handy for milestones, eligibility checks, or simple curiosity. The math accounts for varying month lengths and leap years, and it all runs locally in your browser.
Frequently asked questions
How is age in years, months, and days calculated?
The calculator counts whole years from the birth date, then the remaining whole months, then the leftover days — borrowing from the previous month when needed, just like you'd count it by hand.
Can I find someone's age on a specific past or future date?
Yes. Fill in the 'Age at date' field with any date and the result is calculated for that day instead of today.
Does it account for leap years?
Yes. Because it uses real calendar dates, leap days and the different lengths of each month are handled automatically.
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