Age Calculator
Find your exact age in years, months, days — and count down to your next birthday.
Ever needed your age precisely — for a form, a visa application, or simple curiosity? This age calculator takes your date of birth and works out your exact age in years, months and days, along with fun extras: your total days lived, total weeks, and how many days remain until your next birthday.
How the calculation works
Age is calculated calendar-accurately, not by dividing days by 365. The calculator counts complete years first, then complete months, then remaining days — correctly handling leap years and months of different lengths, the same way official documents do.
Common uses
People use age calculators for official paperwork (many forms require age in completed years as of a specific date), checking eligibility ages, comparing ages between two people, or working out an age on a past or future date. Everything runs locally in your browser and no dates are stored.
Frequently asked questions
How is exact age calculated?
The calculator counts complete calendar years from your birth date, then complete months, then leftover days. This matches how ages are computed on official documents and correctly handles leap years.
What if I was born on February 29?
Leap-day babies age normally: in non-leap years your birthday is treated as March 1 for the countdown, and your completed years still increment once per calendar year.
Can I calculate age at a date other than today?
Yes — set the "age at date" field to any past or future date and the calculator shows how old you were, or will be, on that date.
Why does the calculator show total days lived?
Total days and weeks are handy for milestones (like a 10,000th day), for medical dosing contexts, and honestly — because it’s fun to know.