A free age calculator that shows exactly how old you are in years, months, and days, how many days you have been alive, and a countdown to your next birthday.
Just enter the month, day, and year you were born, and the tool works out your exact age in a single click. It also measures your life in weeks, days, and hours, names the day of the week you were born, and tells you how long until your next birthday arrives.
Below the calculator you will find a plain language guide to how your age is figured, a note on leap years, a table showing how many days old you are at common ages, and answers to the questions people ask most.
Age Calculator
How Old Am I?
Enter your birth date to see your exact age in years, months, and days, how many days you have been alive, and a countdown to your next birthday.
Your birth date
Please enter a valid birth date that is not in the future.
How This Age Calculator Works
The age calculator measures the exact span between your birth date and today. It counts your full years first, then the leftover months, and finally the leftover days, which is the same way ages are written on official forms. You enter three numbers, press the button, and the full breakdown appears right below.
This age calculator is built for general and everyday use. Your birth date stays in your browser and is never saved or sent anywhere.
How Your Age Is Calculated
The tool follows the calendar rather than a plain day count. Say you were born in March. The calculator adds up each full year that has passed, then the extra months since your last birthday, then the extra days since the start of the current month. That layered method is why your age reads as years, months, and days instead of one long number.
Leap years are handled for you as well. Because February gains an extra day every four years, a simple count can drift if those days are ignored. The age calculator folds them in on its own, so your total stays accurate no matter which year you were born.
How Many Days Old You Are at Common Ages
People are often surprised by how the days add up. Here is roughly how many days old you are at a handful of milestone ages.
Age
Approximate days old
10 years
3,653
20 years
7,305
30 years
10,958
40 years
14,610
50 years
18,263
60 years
21,915
These counts are close estimates, since leap years nudge the exact figure by a day here and there. Enter your real birth date above and the calculator gives you the precise number for your own life.
More Than Just Your Age
The calculator returns far more than a single figure. It shows how many months, weeks, days, and hours you have been alive, which can be a fun way to see your life from a fresh angle. It names the day of the week you were born, so you can finally settle whether you are a Monday child or a Friday one. And it counts down the days until your next birthday, along with the age you will turn and the weekday it lands on.
Why People Use an Age Calculator
There are more reasons than you might expect. A few of the most common:
Filling out forms. Applications often ask for your exact age or age in months on a certain date.
Checking eligibility. Jobs, programs, and benefits sometimes carry an age requirement.
Parenting. Doctors track a baby's age in weeks and months, not years.
Planning ahead. A birthday countdown helps with parties, trips, and milestones.
Plain curiosity. Many people simply enjoy knowing the exact count of days behind them.
Frequently Asked Questions
How do I calculate my exact age?
Enter your birth month, day, and year in the tool above, then press the button. The age calculator instantly shows your age in years, months, and days, measured against today's date.
How many days have I been alive?
The calculator counts every day between your birth date and today, leap days included. You will see the total in the results, right beside the count in weeks and hours.
What day of the week was I born?
After you calculate your age, the tool names the weekday of your birth, so you can see at a glance whether you arrived on a weekend or a workday.
What is chronological age?
Chronological age is the plain measure of how long you have been alive, counted from your birth date to today. It is the number this age calculator gives you, and the one used on most official documents.
Is the age calculator free?
Yes. The age calculator is completely free, needs no sign up, and works on any phone, tablet, or computer. Your birth date stays in your browser and is never stored.
