Age calculator
Enter a date of birth to see an exact calendar age and the countdown to the next birthday.
Free online age calculator by date of birth
This free online age calculator by date of birth gives your exact chronological age in years, months, and days. Enter your date of birth and it works as an age calculator for date of birth, year, month, and day — showing completed years, remaining months, extra days, total days lived, your birth weekday, and a live countdown to your next birthday.
Looking for a date of birth calculator online, free, with years, months, and days? That is exactly what this page is: a chronological age calculator that handles leap years and months of different lengths automatically, so the result matches official documents.
Age calculator FAQ
How is the exact age calculated?
The calculator counts completed years first, then completed calendar months, then the remaining days. That avoids treating every month as the same length.
Why can total days differ from years × 365?
Leap years add extra days, so total lifetime days are calculated directly between the birth date and today rather than estimated.
What happens with a February 29 birthday?
In a non-leap year, this calculator uses March 1 for the next-birthday countdown.
How does the age calculator date of birth year month day work?
Enter the year, month, and day of your birth. The tool compares that date of birth with today and returns your age broken into completed years, months, and days — plus total days, weeks, and hours lived.
Is this date of birth calculator online free with years months days?
Yes. It is completely free, works in your browser with no sign-up, and shows your age in years, months, and days instantly — along with your next birthday countdown.
What is a chronological age calculator?
A chronological age calculator measures the exact time elapsed since your date of birth — your age in years, months, and days. This page is one: it calculates chronological age precisely, accounting for leap years.