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Age Calculator
Age Calculator
Calculate your age in years / months / days, plus total days lived and time until your next birthday.
Date of birth
Calculate age on
Calculate
Set “as of” = today
Copy results
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Age
—
Total time lived
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Next birthday
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Enter dates to calculate.
Note: For Feb 29 birthdays, this calculator uses
Feb 28
in non-leap years for “next birthday”.
Explanation
This tool compares your date of birth to an “as of” date and returns your age.
Counts calendar differences (years → months → days), so it handles different month lengths and leap years.
Total days is computed from the exact date difference (not “30 days per month”).
Useful for forms, HR, insurance, and checking age on a specific date.