Excel Age Calculation Formulas
Use these <strong>Excel formulas</strong> to calculate chronological age from date of birth. The <strong>DATEDIF function</strong> provides the most accurate results in years, months, and days. Copy-paste these formulas directly into your spreadsheets for bulk age calculation.
Formula 1: Basic Age in Years
=DATEDIF(A1, B1, "Y")A1 = birth date, B1 = target date. Returns complete years.
Formula 2: Age in Years, Months, and Days
=DATEDIF(A1,B1,"Y")&" years, "&DATEDIF(A1,B1,"YM")&" months, "&DATEDIF(A1,B1,"MD")&" days"Returns a formatted text string like "8 years, 3 months, 12 days".
Formula 3: Age as of Today
=DATEDIF(A1, TODAY(), "Y")Automatically calculates current age. Updates every day.
Formula 4: Total Months
=DATEDIF(A1, B1, "M")Returns total complete months between dates.
Formula 5: YEARFRAC Alternative
=INT(YEARFRAC(A1, B1, 1))Uses actual day count for more precise fractional year calculation. The basis parameter of 1 uses actual/actual day counting.
Formula 6: Days Until Next Birthday
=DATE(YEAR(B1)+IF(DATE(YEAR(B1),MONTH(A1),DAY(A1))<B1,1,0),MONTH(A1),DAY(A1))-B1Calculates how many days remain until the next birthday from the target date.
Bulk Calculation Tips
To process an entire column of birth dates:
- Place birth dates in column A starting at A1
- Enter =TODAY() in cell C1 for current date reference
- In B1, enter: =DATEDIF(A1,$C$1,"Y")&"y "&DATEDIF(A1,$C$1,"YM")&"m "&DATEDIF(A1,$C$1,"MD")&"d"
- Press Ctrl+D to fill the formula down column B
For more calculation tools, visit our interactive calculator or manual calculation guide.