Age Calculator

Date of Birth

Target Date

Please select your date of birth to calculate your age

Age Calculator Guide

Age Calculator: Calculate Your Age in Years, Months, and Days

Ever wondered exactly how old you are—right down to the week or day? Or perhaps you need to know how many days are left until a special occasion like a birthday, anniversary, or holiday. Our Age Calculator helps you do just that! This online tool not only shows your age in years, months, and days but also provides additional insights like total weeks, total days, hours, minutes, and even seconds you have been alive.

In this article, we’ll explore how our Age Calculator works, why it’s helpful, and how you can use it to simplify your everyday planning.

What is an Age Calculator?
Why Use an Age Calculator?
Key Features of Our Age Calculator
How the Age Calculator Works
- 1. Years, Months, and Days Approach
- 2. Exact Total Days Approach
Example: Calculating Your Age
How Many Days Until a Future Date or Event?
Calculating a Newborn’s Age in Weeks and Months
How to Calculate Age from Birthdate in Excel
Other Useful Online Tools
Conclusion

What is an Age Calculator?

An Age Calculator is an online tool that computes the time difference between two dates. Typically, you enter your date of birth and a second date (often today’s date) to see exactly how old you are. You can also select a future date to find out your age on an upcoming day—say, your birthday next year or a special anniversary.

Apart from personal use, an age calculator can help you answer questions like:

How many weeks or days have I been alive?
How many days are left until my birthday or next event?

With our Age Calculator, you can get these answers accurately and quickly.

Why Use an Age Calculator?

Accurate Calculations
Dealing with leap years, varying month lengths, and time spans can be tricky. The calculator automatically accounts for these variations.
Multiple Formats
It provides age in years, months, and days, plus total weeks, days, hours, minutes, and seconds.
Countdown to Important Events
Want to know how many days until your next birthday, an anniversary, or a holiday? Our tool gives you an exact count.
Track Your Child’s Growth
For newborns or young children, age is often told in weeks or months. The Age Calculator can quickly convert time spans to those units.

Key Features of Our Age Calculator

Date Range Flexibility
You can calculate the age for any two dates—not just birthdates.
Days Until Future Date
Input a future date to see how many days are left until then.
Precise Results
We count leap years separately to ensure an accurate total day count.
Easy to Use
Simply enter the dates and click “Calculate” to get immediate results.

How the Age Calculator Works

Our Age Calculator uses two main methods for computing your age or the time between two dates:

1. Years, Months, and Days Approach

Years Treated as 365 Days
Every year is treated as 365 days in this method.
Months as 30.4167 Days
Months are taken as an average of 30.4167 days (365 ÷ 12).
Simple, Everyday Calculation
This approach reflects how we commonly talk about age (e.g., “I’m 15 years old,” not “12 normal years plus 3 leap years”).

2. Exact Total Days Approach

Distinguishing Leap Years
Every regular year (365 days) and leap year (366 days) is counted individually.
Adding Partial Years
For instance, if you were born on March 5 and today is June 7, the calculator precisely counts the days from March 5 to June 7.
Accurate to the Day
This method is particularly useful for knowing the exact number of days you’ve been alive or the days until a future date.

Example: Calculating Your Age

Suppose your birthday is March 5, and today’s date is June 7:

Years, Months, and Days Approach:
You will see an age broken down into standard years, average months, and days.
Exact Total Days Approach:
The calculator will add up all the days across the years, including any leap days, plus the days from March 5 to June 7.

How Many Days Until a Future Date or Event?

Account for Leap Years
February can have 28 or 29 days depending on the year, which affects calculations.
Full Month Days
- January: 31
- February: 28 (29 in a leap year)
- March: 31
- April: 30
- May: 31
- June: 30
- July: 31
- August: 31
- September: 30
- October: 31
- November: 30
- December: 31
Use the Age Calculator for Simplicity
Manually counting days can be time-consuming. Instead, input today’s date as the “Date of Birth” and your target date in the “Find Age on” field, and click “Calculate.” The tool displays how many days remain until that day.

Calculating a Newborn’s Age in Weeks and Months

If you need to track a baby’s growth in weeks or months:

Enter the Baby’s Birthdate in the “Date of Birth” field.
Enter Today’s Date (or any future date) in the “Find Age on” field.
Click “Calculate” to see the baby’s exact age in weeks and months.

This is particularly helpful when doctors or family members ask, “How many weeks old is your baby now?”

How to Calculate Age from Birthdate in Excel

You can also use Microsoft Excel to keep track of age or time spans:

Years Since Birthdate
=DATEDIF(A1, TODAY(), "Y")
(Cell A1 contains the birthdate in MM/DD/YYYY format.)
Months (Excluding Full Years)
=DATEDIF(A1, TODAY(), "YM")
Remaining Days
=DATEDIF(A1, TODAY(), "MD")
Combine All Results
=CONCAT(A2, " years, ", A3, " months, ", A4, " days")
(Here, cells A2, A3, and A4 refer to the outputs of the above formulas.)

Other Useful Online Tools

At AtoZPDFTools, we offer more than just an Age Calculator. Explore our range of calculators and PDF tools to simplify your life:

Loan Calculator – Plan your loan payments by calculating monthly EMIs and total interest.
Mortgage Calculator – Find out how much you’d pay for your home loan over time.
SIP Calculator – Estimate your investment growth in mutual funds.
Income Tax Calculator – Determine how much tax you might owe based on your annual income.
Percentage Calculator – Easily solve all percentage-related calculations.
BMI Calculator – Quickly check your Body Mass Index to monitor your health.

In addition, you’ll find handy PDF Tools such as:

Conclusion

Calculating your exact age, down to the day or even the second, can be a fun and enlightening experience. Our Age Calculator makes it quick, accurate, and hassle-free. Whether you’re planning for your next birthday, tracking your newborn’s weekly growth, or simply curious about how many days you’ve been on this Earth, our tool is here to assist.

Don’t forget to explore other helpful calculators and PDF tools at AtoZPDFTools to make your daily life easier. Give our Age Calculator a try today, and see how simple precise date calculations can be!