Google Sheets: How to Calculate Age from Date of Birth


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

To convert the date of birth to an age in decimal years for cell A2, we can type the following formula into cell B2:

=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:

How to Calculate Average Time in Google Sheets
How to Calculate Average Age in Google Sheets
How to Calculate a Future Date in Google Sheets

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