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To calculate age from date of birth using Google Sheets, you can use the DATEDIF function. This function takes the date of birth as the starting date and today’s date as the ending date, and returns the age in years, months, or days. First, enter the date of birth in one cell and today’s date in another cell. Then, use the DATEDIF function in a third cell, specifying the start date, end date, and unit of measurement (e.g. “Y” for years). This will give you the age in years. You can also use this function to calculate age in months or days by changing the unit of measurement.
You can use the following formulas to calculate age based on date of birth in Excel:
Formula 1: Calculate Age in Years (e.g. 23 years)
=DATEDIF(A2,NOW(),"y")
Formula 2: Calculate Age in Decimal Years (e.g. 23.567 years)
=YEARFRAC(A2,NOW())
Formula 3: Calculate Age in Years, Months, Days (e.g. 23 years, 6 months, 25 days)
=DATEDIF(A2,NOW(),"y")&" years, "&DATEDIF(A2,NOW(),"ym")&" months, "&DATEDIF(A2,NOW(),"md")&" days"
Each formula assumes that the date of birth is located in cell A2.
The following examples show how to use each formula in practice with the following date of births in Google Sheets:
Example 1: Calculate Age in Years
To convert the date of birth to age for cell A2, we can type the following formula into cell B2:
=DATEDIF(A2,NOW(),"y")
We can then click and drag this formula down to each remaining cell in column B:
Column B displays the age for each birth date in column A in terms of years.
Example 2: Calculate Age in Decimal Years
=YEARFRAC(A2,NOW())
We can then click and drag this formula down to each remaining cell in column B:
Column B displays the age for each birth date in column A in terms of decimal years.
Example 3: Convert Date of Birth to Age in Years, Months, Days
To convert the date of birth to an age in years, months and days for cell A2, we can type the following formula into cell B2:
=DATEDIF(A2,NOW(),"y")&" years, "&DATEDIF(A2,NOW(),"ym")&" months, "&DATEDIF(A2,NOW(),"md")&" days"
We can then click and drag this formula down to each remaining cell in column B:
Column B displays the age for each birth date in column A in terms of years, months, and days.
Additional Resources
The following tutorials explain how to perform other common tasks in Google Sheets: