Calculating age from birth date in Excel is a simple task that can be accomplished with a few basic steps. Whether you’re working with a personal spreadsheet or a large dataset, knowing how to calculate age can be incredibly useful for a variety of purposes, such as tracking employee information, calculating insurance premiums, or even planning birthday parties.
In this article, we’ll guide you through the process of calculating age from birth date in Excel, step by step. We’ll start with the basics of using the DATE function to extract the year, month, and day components of a birth date, and then we’ll show you how to use these components to calculate the person’s age in years, months, and days. By the end of this article, you’ll have the skills and knowledge necessary to perform age calculations quickly and easily in Excel.
Before diving into the specific steps, let’s first understand the underlying concept behind calculating age from a birth date. Age is essentially the difference between a person’s current date and their birth date. To calculate age in years, we need to determine the number of years that have elapsed since the person’s birth year. For months and days, we need to consider the difference between the current month and day and the birth month and day.
How to Calculate Age from Birth Date in Excel
Calculating age from birth date in Excel is a simple yet useful task. Here are 8 important points to remember:
 Use the DATE function to extract year, month, and day from birth date.
 Calculate age in years by subtracting birth year from current year.
 Consider leap years when calculating age in years.
 Use the MONTH function to extract the birth month and current month.
 Calculate age in months by subtracting birth month from current month.
 Use the DAY function to extract the birth day and current day.
 Calculate age in days by subtracting birth day from current day.
 Format the result cells to display age in the desired format.
By following these steps, you can easily calculate age from birth date in Excel, whether you’re working with a personal spreadsheet or a large dataset.
Use the DATE function to extract year, month, and day from birth date.
The DATE function in Excel is a powerful tool that allows you to extract the year, month, and day components from a date value. This is the first step in calculating age from birth date in Excel.
The DATE function takes three arguments: year, month, and day. The year argument is a fourdigit number representing the year, the month argument is a number between 1 and 12 representing the month, and the day argument is a number between 1 and 31 representing the day.
To extract the year, month, and day from a birth date, you can use the following formula:
=DATE(YEAR(birth_date), MONTH(birth_date), DAY(birth_date))
For example, if the birth date is stored in cell A2, the formula would be:
=DATE(YEAR(A2), MONTH(A2), DAY(A2))
This formula will return a date value that represents the birth date. You can then use this date value in other calculations to determine the person’s age.
The DATE function can also be used to extract the current date. To do this, simply omit the arguments and use the following formula:
=DATE()
The DATE function is a versatile tool that can be used for a variety of daterelated calculations in Excel. By understanding how to use the DATE function, you can easily extract the year, month, and day components from a birth date and use this information to calculate age.
Calculate age in years by subtracting birth year from current year.
Once you have extracted the year component from the birth date and the current date, you can calculate the person’s age in years by simply subtracting the birth year from the current year.

1. Extract the birth year and current year:
Use the YEAR function to extract the year component from the birth date and the current date. The YEAR function takes a date value as its argument and returns a fourdigit year.

2. Subtract the birth year from the current year:
Once you have the birth year and the current year, you can subtract the birth year from the current year to get the person’s age in years. The following formula shows how to do this:
=current_year – birth_year

3. Consider leap years:
When calculating age in years, it’s important to consider leap years. A leap year is a year that has 366 days instead of the usual 365 days. Leap years occur every four years, except for years that are divisible by 100 but not by 400. For example, the year 2000 was a leap year, but the year 1900 was not.

4. Format the result:
Once you have calculated the person’s age in years, you can format the result to display it in the desired format. For example, you can format the result as a whole number or as a decimal number with two decimal places.
By following these steps, you can easily calculate a person’s age in years from their birth date in Excel. This information can be useful for a variety of purposes, such as tracking employee information, calculating insurance premiums, or even planning birthday parties.
Consider leap years when calculating age in years.
Leap years can be tricky when calculating age in years. A leap year is a year that has 366 days instead of the usual 365 days. This can throw off your calculations if you’re not careful.

1. Leap years occur every four years:
The most important thing to remember about leap years is that they occur every four years. This means that if someone was born on February 29th, their birthday will only come around every four years.

Exceptions to the rule:
There are two exceptions to the rule that leap years occur every four years. The first exception is that years that are divisible by 100 are not leap years. For example, the year 1900 was not a leap year.

Second exception:
The second exception is that years that are divisible by 400 are leap years. For example, the year 2000 was a leap year.

Adjust your calculations:
When calculating age in years, you need to adjust your calculations to account for leap years. If the person’s birthday falls on February 29th, you need to add an extra day to their age every four years. You can do this by using the following formula:
=age_in_years + IF(MONTH(birth_date) = 2 AND DAY(birth_date) = 29, 1, 0)
By following these steps, you can ensure that your age calculations are accurate, even for people who were born on leap day.
Use the MONTH function to extract the birth month and current month.
Once you have calculated the person’s age in years, you can use the MONTH function to extract the birth month and the current month. This information can be useful for calculating age in months and days.

1. Extract the birth month and current month:
Use the MONTH function to extract the month component from the birth date and the current date. The MONTH function takes a date value as its argument and returns a number between 1 and 12, representing the month.

2. Calculate the difference between the birth month and the current month:
Once you have the birth month and the current month, you can calculate the difference between them using the following formula:
=current_month – birth_month

3. Adjust for negative values:
If the result of the calculation is a negative value, it means that the person’s birthday has not yet occurred in the current year. In this case, you need to add 12 to the result to get the correct difference.

4. Format the result:
Once you have calculated the difference between the birth month and the current month, you can format the result to display it in the desired format. For example, you can format the result as a whole number or as a decimal number with two decimal places.
By following these steps, you can easily extract the birth month and the current month from a date value and use this information to calculate age in months and days.
Calculate age in months by subtracting birth month from current month.
Once you have extracted the birth month and the current month, you can calculate the person’s age in months by simply subtracting the birth month from the current month.

1. Subtract the birth month from the current month:
To calculate the person’s age in months, simply subtract the birth month from the current month using the following formula:
=current_month – birth_month

2. Adjust for negative values:
If the result of the calculation is a negative value, it means that the person’s birthday has not yet occurred in the current year. In this case, you need to add 12 to the result to get the correct age in months.

3. Consider leap years:
When calculating age in months, it’s important to consider leap years. If the person’s birthday falls in February, you need to add an extra day to their age every four years. You can do this by using the following formula:
=age_in_months + IF(MONTH(birth_date) = 2, 1, 0)

4. Format the result:
Once you have calculated the person’s age in months, you can format the result to display it in the desired format. For example, you can format the result as a whole number or as a decimal number with two decimal places.
By following these steps, you can easily calculate a person’s age in months from their birth date in Excel. This information can be useful for a variety of purposes, such as tracking employee information, calculating insurance premiums, or even planning birthday parties.
Use the DAY function to extract the birth day and current day.
Once you have calculated the person’s age in years and months, you can use the DAY function to extract the birth day and the current day. This information can be useful for calculating age in days.

1. Extract the birth day and current day:
Use the DAY function to extract the day component from the birth date and the current date. The DAY function takes a date value as its argument and returns a number between 1 and 31, representing the day of the month.

2. Calculate the difference between the birth day and the current day:
Once you have the birth day and the current day, you can calculate the difference between them using the following formula:
=current_day – birth_day

3. Adjust for negative values:
If the result of the calculation is a negative value, it means that the person’s birthday has not yet occurred in the current month. In this case, you need to add the number of days in the previous month to the result to get the correct difference.

4. Format the result:
Once you have calculated the difference between the birth day and the current day, you can format the result to display it in the desired format. For example, you can format the result as a whole number or as a decimal number with two decimal places.
By following these steps, you can easily extract the birth day and the current day from a date value and use this information to calculate age in days.
Calculate age in days by subtracting birth day from current day.
Once you have extracted the birth day and the current day, you can calculate the person’s age in days by simply subtracting the birth day from the current day.

1. Subtract the birth day from the current day:
To calculate the person’s age in days, simply subtract the birth day from the current day using the following formula:
=current_day – birth_day

2. Adjust for negative values:
If the result of the calculation is a negative value, it means that the person’s birthday has not yet occurred in the current month. In this case, you need to add the number of days in the previous month to the result to get the correct age in days.

3. Consider leap years:
When calculating age in days, it’s important to consider leap years. If the person’s birthday falls in February, you need to add an extra day to their age every four years. You can do this by using the following formula:
=age_in_days + IF(MONTH(birth_date) = 2, 1, 0)

4. Format the result:
Once you have calculated the person’s age in days, you can format the result to display it in the desired format. For example, you can format the result as a whole number or as a decimal number with two decimal places.
By following these steps, you can easily calculate a person’s age in days from their birth date in Excel. This information can be useful for a variety of purposes, such as tracking employee information, calculating insurance premiums, or even planning birthday parties.
Format the result cells to display age in the desired format.
Once you have calculated the person’s age in years, months, and days, you can format the result cells to display the age in the desired format. Excel provides a variety of formatting options that you can use to customize the appearance of the result cells.
To format the result cells, follow these steps:

Select the result cells:
Select the cells that contain the age calculations. 
Open the Format Cells dialog box:
Rightclick on the selected cells and select “Format Cells” from the context menu. You can also press Ctrl+1 to open the Format Cells dialog box. 
Select the desired number format:
In the Format Cells dialog box, click on the “Number” tab. In the “Category” list, select the “Number” category. In the “Format” list, select the desired number format. For example, you can select the “General” format to display the age as a whole number, or you can select the “Decimal” format to display the age with two decimal places. 
Apply the number format:
Once you have selected the desired number format, click on the “OK” button to apply the format to the selected cells.
In addition to the basic number formats, Excel also provides a variety of custom number formats that you can use to display the age in a more specific way. For example, you can use the following custom number format to display the age in years, months, and days:
[>=1]”y” “y” “m” “d”;[>0]0″y” “m” “d”;0″d”
This custom number format will display the age in years, months, and days, with the years and months displayed as whole numbers and the days displayed as a decimal number with two decimal places. If the age is less than one year, it will be displayed as the number of days.
By following these steps, you can easily format the result cells to display the person’s age in the desired format.
FAQ
If you have any questions about how to calculate age from birth date in Excel, check out these frequently asked questions:
Question 1: How do I calculate my age in years from my birth date?
Answer 1: To calculate your age in years from your birth date, simply subtract your birth year from the current year.
Question 2: How do I calculate my age in months from my birth date?
Answer 2: To calculate your age in months from your birth date, first calculate your age in years. Then, multiply your age in years by 12.
Question 3: How do I calculate my age in days from my birth date?
Answer 3: To calculate your age in days from your birth date, first calculate your age in years. Then, multiply your age in years by 365. You may need to adjust this calculation for leap years.
Question 4: How do I format the result cells to display my age in the desired format?
Answer 4: To format the result cells to display your age in the desired format, select the cells that contain the age calculations and then open the Format Cells dialog box. In the Number tab, select the desired number format from the Category list.
Question 5: Can I use Excel to calculate the age of multiple people?
Answer 5: Yes, you can use Excel to calculate the age of multiple people. Simply enter the birth dates of each person in a separate column. Then, use the formulas described above to calculate the age of each person.
Question 6: Can I use Excel to create a birthday reminder list?
Answer 6: Yes, you can use Excel to create a birthday reminder list. Simply enter the names, birth dates, and email addresses of each person in a spreadsheet. Then, use the TODAY function and conditional formatting to highlight the rows of people who have birthdays coming up.
If you have any other questions about calculating age from birth date in Excel, please feel free to leave a comment below.
Now that you know how to calculate age from birth date in Excel, check out these tips for using the DATE, MONTH, DAY, and YEAR functions:
Tips
Here are a few tips for using the DATE, MONTH, DAY, and YEAR functions in Excel to calculate age from birth date:
Tip 1: Use the DATE function to extract the year, month, and day components of a birth date.
The DATE function allows you to extract the year, month, and day components of a birth date into separate cells. This makes it easy to perform calculations on the individual components.
Tip 2: Use the MONTH function to extract the birth month and the current month.
The MONTH function allows you to extract the birth month and the current month into separate cells. This makes it easy to calculate the difference between the birth month and the current month.
Tip 3: Use the DAY function to extract the birth day and the current day.
The DAY function allows you to extract the birth day and the current day into separate cells. This makes it easy to calculate the difference between the birth day and the current day.
Tip 4: Use the TODAY function to get the current date.
The TODAY function returns the current date as a date value. This can be used in conjunction with the DATE, MONTH, and DAY functions to calculate the age of a person as of the current date.
By following these tips, you can easily use the DATE, MONTH, DAY, and YEAR functions to calculate age from birth date in Excel.
Now that you know how to calculate age from birth date in Excel, you can use this skill to track employee information, calculate insurance premiums, or even plan birthday parties.
Conclusion
Calculating age from birth date in Excel is a simple yet useful task that can be accomplished with a few basic steps. By using the DATE, MONTH, DAY, and YEAR functions, you can easily extract the year, month, and day components of a birth date and use this information to calculate the person’s age in years, months, and days.
This information can be useful for a variety of purposes, such as tracking employee information, calculating insurance premiums, or even planning birthday parties. By following the steps outlined in this article, you can easily calculate age from birth date in Excel, regardless of your skill level.
So, the next time you need to calculate someone’s age, don’t reach for a calculator. Just open up Excel and follow the steps in this article. You’ll be amazed at how easy it is!