Age Calculator

Do you want to calculate your age? Then the age calculator online tool is best for you. You can use the age calculator to check the age of someone and something, getting accurate answers instantly. Follow this guide to know everything about age calculation, age calculators, and other relevant information for determining age.

What is an Age Calculator?

An age calculator is an online tool that calculates the age of someone. It determines how old a person or thing is by using information on birth date and current date to deduce age. An age calculator can measure age in years, months, and even days, and can also allow users to find the age of someone at any point in time by adjusting the current date.

How to Use Age Calculator?

To use an age calculator correctly, follow the steps below:

• Input Date of Birth: Enter the date of birth of the person you want to calculate their age in the available space. Input the information in the highlighted format (e.g mm/dd/yy), and make sure it is the date you want to start calculating from.
• Input Current Date: In the next input field, enter today’s date to calculate age until today. Some age calculators may not require users to do this as it is already a placeholder You may also decide to enter a date you want to calculate up to rather than the current date.
• Calculate Age: Click the “Calculate” to proceed with the calculation. You’ll be able to view the age of the person in days, months, and years equivalents, or in singular expressions. .
• Reset Calculator: After successfully calculating age with the calculator, click the reset button to clear your data. This way you can enter new data to calculate another person’s age.

What Does the Output Page of this Calculator Show?

The output age of an age calculator shows the results in the following ways:

• An equivalent of the subject’s age in days, months, and years equivalents. For example, the output page of the age calculation for the date of birth, May 03, 1919, and the current date of May 02, 2025, will show 102 years, 11 months 19 days.
• A singular expression summarizing the age in various units, such as months and days, weeks and days, days alone, and even down to hours, minutes, and seconds. For example, the output page of the age calculation for the date of birth, May 03, 1919, and the current date of May 02, 2025, will show:
  • 1271 months, 19 days, or
  • 5,529 weeks, 3 days, or
  • 38,706 days or
  • 928,944 hours or
  • 55,736,640 minutes or
  • 3,344,198,400 seconds

How Does Age Calculator Work?

An age calculator works by subtracting the date of birth from the current date, while considering leap years, to deduct the number of years, months, or days lived by the subject. The calculator is based on the Gregorian calendar, which divides a year into 365 days and a leap year into 366 days.

The calculator employs the standard age system, where an individual’s age begins at zero and advances to one year only upon completing 12 months. Consistent with this method, any age calculation performed here increments a person’s age by one year after the passage of 12 full months from their birth or starting date.

Why Use Our Age Calculator?

If you’re looking to calculate the age of someone or something, here’s why our age calculator is the best option for you:

• Instant Results: Get your exact age in a split second once you click the calculate button.
• User-Friendly Interface: Enjoy an easy-to-use calculator design that fits every device, allowing smooth operations with a few clicks.
• Accurate Calculations: Leverage our real-time date and time for accuracy, including a fool-proof algorithm cut out for precision.
• Privacy-Focused: Our calculator does not store or share your personal data.
• Free and Accessible: Access our calculator anytime and calculate as much age data as you want without any costs.
• Multiple results formats: View age in years, total days, or even weeks and hours.

Where You Can Use This Age Calculator

Here are situations or contexts where you can use an age calculator:

• Personal age check: You can use an age calculator to calculate your own age or that of any individual.
• Age check in bulk: Age calculators can be useful for calculating the individual ages of multiple individuals, such as in surveys, forms, or databases.
• Finding age difference: Easily find the age gap between two individuals with age calculators.
• Artefacts dating: When trying to date historical items, age calculators are a great tool for running complex age calculations.

What is My Age?

To know your age, subtract your birth year from the current year. If your birthday has already occurred this year, that’s your current age. If your birthday hasn’t happened yet this year, subtract one from that result. You can also use the age calculator for accurate results, getting your current age and your age at any point in time, broken down to years, months, and days.

How Old is My Child?

Calculate the age of your child by inputting the date of their birth into the age calculator. As a parent of a newborn, the calculator will help you determine how old they are, providing their age in weeks or months.

For example, the age of a child born on 1st January 2025 will be 4 months and a day by 3rd May, 2025. In smaller age units, the child will be 17 weeks and 3 day-old, or more precisely, 122-day old.

How Age is Calculated

The age calculator calculates age using two different primary methods, depending on the format you need:

• Standard Age Format (Years, Months, and Days): In this method, age is calculated by measuring how many full years, months, and days have passed between two dates. The following are calculation guidelines:
  • Every year is treated as 365 days, regardless of leap years.
  • Each month is averaged at 30.4167 days, calculated by dividing 365 by 12.
• Total Days Calculation: In this case, the age calculator determines the exact number of days between two dates. This age calculation method:
  • Counts each regular as 366 days.
  • Accurately calculates leap years with their extra days.
  • Including any remaining days in the partial year or month between the two dates

Number of Days per Month

The following table shows the number of days in each month of the year: 

How to Calculate Age from Birthdate in Excel

You can calculate age in Excel using simple formulas and the date of birth. Follow the steps below to get started: 

• Enter the date of birth in a cell using the MM/DD/YYYY format. For example, type 03/15/1990 in cell A1.
• Calculate the number of full years since that date by entering the following formula in another cell: =DATEDIF(A1, TODAY(), “Y”).
• Use the following formula to calculate the number of full months after the last completed year: =DATEDIF(A1, TODAY(), “YM”).
• To find the remaining days after the last full month, use this formula: =DATEDIF(A1, TODAY(), “MD”).
• To combine the results into one readable sentence, use the CONCAT function like this: =CONCAT(A2, ” years, “, A3, ” months, “, A4, ” days”). Here, A2, A3, and A4 represent the results from steps 2, 3, and 4.

Different Cultural Methods of Age Calculation

Given the several cultural variations in age calculation, the following should be considered when calculating age: 

Conclusion

An age calculator is a helpful tool for quickly calculating one’s age, or the period of years, months, or days, between two dates. Different places in the world have their own age systems, so it is advisable that you consider these systems when calculating age within a particular cultural context.