Age Calculator
Enter your date of birth to instantly calculate your exact age in years, months, and days. The calculator also shows your total days and weeks lived, and how many days are left until your next birthday.
Frequently Asked Questions
How is exact age calculated?
The calculator counts the full years, months, and remaining days between your birth date and today. For example, if you were born on March 15, 1990, and today is May 20, 2025, your age is 35 years, 2 months, and 5 days.
How many days have I lived?
Multiply your age in years by 365.25 (to account for leap years) as a quick estimate. The calculator computes the exact number by counting every day from your birth date to today.
What is a leap year and how does it affect age?
A leap year has 366 days instead of 365, occurring every 4 years (with exceptions for century years). If you were born on February 29, your "official" birthday is celebrated on March 1 in non-leap years in most countries.
How do I calculate my age in months?
Multiply completed years by 12 and add the remaining months. For example, 25 years and 3 months = 25 × 12 + 3 = 303 months. The calculator shows this total automatically.
How many weeks are in a year?
There are exactly 52 weeks and 1 day in a regular year (365 days ÷ 7 = 52.14...), and 52 weeks and 2 days in a leap year. Over a lifetime of 70 years, that's approximately 3,652 weeks.