Age Calculator
Calculate your exact age in years, months and days from your date of birth. Free online age calculator with next-birthday countdown.
About the Age Calculator
This free age calculator works out your exact chronological age from your date of birth — in years, months and days, plus the total number of days you have lived. Pick your birth date, and the result updates instantly. You can also set a custom "as of" date, which is handy for official forms, school admissions, job applications or competitive exams that require your age on a specific cut-off date.
The calculator uses real calendar arithmetic rather than a rough 365-day approximation. It counts complete years first, then complete months, then the remaining days, correctly handling leap years and months of different lengths. That is why the answer here matches how age is defined on government documents: you turn one year older only on the anniversary of your birth date.
Alongside your precise age, the tool shows a countdown to your next birthday in days. Everything runs in your browser — no sign-up, no data sent to a server — making it a quick, private way to answer "how old am I exactly?" for yourself, your children or anyone else.
How to Use the Age Calculator
- 1Select your date of birth in the first field.
- 2Optionally change the "Age as of" date — it defaults to today.
- 3Read your exact age in years, months and days instantly.
- 4Check the total days lived and the countdown to your next birthday.
Frequently Asked Questions
How is exact age calculated from a date of birth?
The calculator subtracts your birth date from today's date using calendar rules: it first counts full years (each ending on your birthday anniversary), then full months, then leftover days. Leap years and varying month lengths are handled automatically, so the result matches the age used on official documents rather than a rough 365-day estimate.
Can I calculate my age on a specific date, like an exam cut-off?
Yes. Change the "Age as of" field to any date — past or future — and the calculator shows your exact age on that day. This is useful for eligibility checks for exams, school admissions, visas and job applications, which usually specify age as on a particular cut-off date.
Does the age calculator account for leap years?
Yes. Because the tool works with real calendar dates instead of assuming every year has 365 days, February 29 births and leap-year spans are counted correctly. The total-days figure is computed from actual elapsed time between the two dates, so it is exact.
What if I was born on February 29?
Your age still increases once per calendar year. In non-leap years, the calculator treats March 1 as the day your completed-years count increases, which is the convention most jurisdictions use. Your exact age in months and days remains precise in every year.
Is my date of birth stored anywhere?
No. The entire calculation happens locally in your browser using JavaScript. Nothing you type is uploaded, logged or stored on a server, so you can use the tool for yourself, family members or clients with complete privacy.