SnapTool Logo
SnapToolSnap. Solve. Done.

Age Calculator

Calculate your exact age in years, months, and days. See your total days lived, next birthday countdown, day of the week you were born, and your zodiac sign — free and instant.

Last Updated: May 2026

Advertisement

Ad Space (Responsive)

How to Use the Age Calculator

  1. 1

    Enter Your Date of Birth

    Click the date picker and select your birth date. The calendar restricts future dates automatically.

  2. 2

    Set the Target Date (Optional)

    By default, the tool calculates age as of today. Change the 'Age as of' date to find age at any point in time — past or future.

  3. 3

    Click Calculate Age

    Your exact age in years, months, and days appears instantly, along with your total days lived, birthday countdown, day of the week you were born, and zodiac sign.

What Is an Age Calculator?

An age calculator computes the exact elapsed time between a date of birth and a target date, expressed in years, months, and days. Unlike a simple year subtraction, a proper age calculator accounts for the varying lengths of months, leap years, and whether a birthday has occurred in the current year yet. Our free age calculator goes further — it also shows your total days lived (a surprisingly motivating number), counts down the days to your next birthday, identifies the day of the week you were born on, and reveals your zodiac sign. All calculations are performed entirely in your browser using JavaScript's native Date object.

Interesting Age Facts

~27,375 days

Average human lifespan (75 years)

7 years

All cells in your body are replaced approximately every 7 years

1 in 1,461

Odds of being born on February 29 (leap day)

~25,000 days

The number of sunrises the average person witnesses

Frequently Asked Questions

How do I calculate my exact age?

Your exact age is calculated by finding the difference between your date of birth and today's date (or any target date). This gives you years, then the remaining months, then the remaining days. Our calculator handles all edge cases including leap years and months with different day counts.

How many days old am I?

To find how many days old you are, multiply your age in years by 365, add the days in the remaining months, and add any additional days. Our age calculator does this automatically and shows your total days lived in the result. The average person lives approximately 27,375 days (75 years).

Can I calculate someone else's age from their date of birth?

Yes — you can calculate anyone's age. Enter their date of birth in the 'Date of Birth' field, and optionally change the 'Age as of' date to any target date. This is useful for calculating the age of a historical figure, a child, or an elderly relative.

What is my zodiac sign based on my birthday?

Your zodiac sign (also called sun sign) is determined by your date of birth. For example: Aries is March 21–April 19, Taurus is April 20–May 20, and so on through Pisces (February 19–March 20). Our calculator displays your zodiac sign automatically after you enter your date of birth.

How are leap years handled in age calculation?

Our age calculator correctly handles leap years. February 29 birthdays are counted as February 28 in non-leap years when calculating the remaining days. The total days lived count is always calculated from the actual calendar difference between two dates, so leap year days are included.

Advertisement

Vertical Ad (Skyscraper)