Age CalculatorPrivate, Instant, In Your Browser
Enter a date of birth and we'll break the age down precisely — full years, remaining months and leftover days — and count down to the next birthday. Calendar months have different lengths, so "how old exactly?" is fiddlier than it looks; the calculator walks the real calendar instead of dividing by 365. Like every tool we build, it runs entirely on your device: your date of birth stays in this tab.
Pick a date of birth to see the exact age.
Calculated on your device — your date of birth is never sent anywhere.
Frequently Asked Questions
How is exact age calculated?
We count full years first, then full calendar months since the last birthday, then the days left over. Because months are 28–31 days long, this walk through the real calendar is the only way to get an exact answer — dividing total days by 365.25 gives only an approximation.
What happens if I was born on February 29?
In non-leap years the calculator treats February 28 as the birthday anniversary, which is the most common civil-law convention. Your next-birthday countdown targets the next date that actually exists.
Is my date of birth uploaded or stored?
No. The whole calculation is a few lines of JavaScript running in your browser tab. Nothing is transmitted, logged or stored — close the tab and the date is gone.
Can I calculate someone else's age, or an age at a past date?
Any date of birth works, so you can check the age of a relative, a document or a historical figure. The result is always relative to today's date on your device.