Age Calculator — How Old Am I?
Enter your date of birth and get your exact age in years, months and days — plus total months, weeks, days and hours, the weekday you were born on, your next birthday countdown and your zodiac sign. Free, instant, no signup.
| Total months | — |
| Total weeks | — |
| Total days | — |
| Total hours | — |
| Total minutes | — |
| Total seconds | — |
| Born on | — |
| Next birthday | — |
| Zodiac sign | — |
100% private — your date of birth never leaves your browser.
How to use this calculator
How the age calculator works
Your exact age is the time between two dates: your date of birth and today (or any “as of” date you choose). This age calculator counts full years first, then the remaining full months, then the remaining days — the same way official documents do. The tricky part is months: they are 28 to 31 days long, and leap years add a February 29 every four years. A naive calculator that treats every month as 30 days drifts by several days over a lifetime; this one borrows days from the actual previous month, so the result is exact.
More than just years
Knowing you are “27 years old” is rarely the whole story. Forms and eligibility rules sometimes ask for age in months; curious minds want the total days lived; and the weekday you were born on is a classic conversation starter. That is why the calculator also shows total months, weeks, days, hours and minutes, plus your birth weekday and Western zodiac sign — all computed instantly from the same date.
Birthdays and the Feb 29 edge case
The next-birthday countdown tells you how many days remain until your next birthday, which weekday it falls on, and which age you will turn. If you were born on February 29, the calculator celebrates on February 28 in non-leap years — the most widely used convention.
How to calculate age manually
You can work out anyone's exact age on paper in three steps. Say someone was born on 15 June 2000 and today is 4 October 2026: 1) Subtract the years: 2026 − 2000 = 26. 2) Subtract the months: 10 − 6 = 4. 3) Subtract the days: 4 − 15 is negative, so borrow the length of the previous month (September has 30 days): 4 + 30 − 15 = 19 days, and subtract one month. Result: 26 years, 3 months, 19 days. The borrowing step is where most people — and sloppy calculators — go wrong, because months are 28 to 31 days long. If the month subtraction goes negative, subtract one year and add 12 months instead.
Popular uses
People use an age calculator for job and visa forms that ask for age on a specific date, school admission cutoffs, retirement planning, insurance quotes, and — honestly — just for fun. Whatever the reason, your date of birth stays on your device: the calculation runs entirely in your browser and nothing is uploaded or stored. If you like quick everyday tools, try our QR code generator next.