How to convert date of birth to age in act

Imagine you're working with a list of birth dates in Excel and need to show their precise current ages. How can you efficiently achieve this? This article provides tips for easily calculating age from a date of birth in Excel.

Calculate age from date of birth with formulas

In this section, we've outlined various formulas to calculate age from the date of birth under different scenarios:

• Calculate age as the number of full years
  • With INT function (Basic)
  • With YEARFRAC function (More accurate)
  • With DATEDIF function (Can display age in various time units)
  • With DATEDIF function

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  Convert birthdate to age with INT function

  We can calculate age by subtracting the birth date from the current date. Then, by using the INT function, we can display the age in complete years as follows:

  Select a blank cell where you want the age to be displayed, input the below formula and press the Enter key. Then, select the result cell and drag its fill handle (the small green square in the lower-right corner of the cell) down to get all results.

  =INT((TODAY()-A2)/365)

  

  Notes:

  To get someone's age at a certain date, replace the TODAY() function in the formula with that specific date. For instance, if the particular date is in cell B2, use the formula below:

  =INT((B2-A2)/365)

  

• Using this formula in Excel, which divides the difference in days between two dates by 365, usually yields accurate results, but it's not perfect. It may inaccurately calculate ages around leap years or for those born on February 29. An alternative is to divide by 365.25 to account for leap years, but this can also lead to errors, especially for ages not spanning a leap year. While this method is generally effective, it's not ideal for precise calculations. The following formulas introduce specialized functions that provide flawless age calculations in all scenarios.

Convert birthdate to age with the YEARFRAC function

The YEARFRAC function is more accurate for calculating age from a date of birth because it considers the exact number of days in each year, including leap years. By setting the third argument, basis , to 1, YEARFRAC uses the actual day count in its calculation, ensuring precision, especially in cases involving leap years.

In an empty cell where you want the age calculated, enter the formula below and press Enter . To replicate this calculation for other data, drag the fill handle of the result cell downward.

=ROUNDDOWN(YEARFRAC(A2, TODAY(), 1), 0)

Convert birthdate to age with the DATEDIF function

The DATEDIF function in Excel can be used to calculate age from a date of birth. By using "y" in the unit argument of the function, it calculates the number of complete years between two dates.

Select an empty cell to display the age, input the formula provided below, and hit the Enter key. Then, click on the cell with the result and drag its fill handle downwards to apply the formula to other cells and obtain all results.

=DATEDIF(A2,NOW(),"y")

Note: In the above DATEDIF formula, "y" calculates the complete years from the date in cell A2 to today. You can substitute "y" with "m", "d", "md", "ym", or "yd" to calculate different aspects of the date difference:

• "M": The number of complete months in the given period.
• "D": The number of days in the given period.
• "MD": The difference between the days of the given two dates. The months and years of the dates are ignored.
• "YM": The difference between the months of the given two dates. The days and years of the dates are ignored
• "YD": The difference between the days of the given two dates. The years of the dates are ignored.

Display age in Year + Month + Day format with the DATEDIF function

To calculate age in the format of Year + Month + Day, combine three DATEDIF formulas in Excel, each with a different unit argument.

Select an empty cell to display the age, input the formula provided below, and hit the Enter key. Then, click on the cell with the result and drag its fill handle downwards to apply the formula to other cells and obtain all results.

=DATEDIF(A2,TODAY(),"Y") & " Years, " & DATEDIF(A2,TODAY(),"YM") & " Months, " & DATEDIF(A2,TODAY(),"MD") & " Days"

Easily calculate age from date of birth without remembering formulas

Kutools for Excel's Date & Time Helper feature simplifies age calculations, allowing you to easily convert birthdates to age with just a few clicks, without the need to remember formulas. It offers the flexibility to calculate age up to the current day or a specific date, and provides results in various formats like years, months, weeks, days, or a combination of years + months + days. This user-friendly tool streamlines the process, making it quick and accessible for all Excel users.

Before applying Kutools for Excel, please download and install it firstly.

1. Select a blank cell to display the age. Then click Kutools >Formula Helper >Date & Time Helper.
   
2. In the Date & Time Helper dialog box, please configure as follows.
   1. Go to the Age tab;
   2. In the Date of Birth box, select the cell containing the birth date you wish to calculate the age from;
   3. Choose the Today option in the To section;
   4. Choose the desired age output format, like years, months, days, or a combination, from the Output result type drop-down list;
   5. Click the OK button.
      

Then the age is populated in the selected cell. Select the result cell and then drag its fill handle all the way down to get all ages.

Notes:

• To display the age in the Year + Month + Day format, select Year + Month + Day from the Output result type drop-down list. The result will appear as illustrated in the screenshot below. Additionally, this feature supports displaying age in months, weeks, or days, catering to your specific requirements.
  
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