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Age Calculator
Calculate age in years, months, days, and total days between two dates.
Enter your details
Guide
How this age calculator works
This tool calculates the time between a birth date and another date. It shows calendar age plus total days.
Enter the birth date
Start with the original date you want to measure from.
Choose an as-of date
Use today, a future date, or a past date for comparison.
Review calendar age
Years, months, and days are calculated using calendar boundaries.
FAQs
Why do months vary?
Calendar months have different numbers of days, so month and day results depend on the specific dates.
Can I calculate age on a future date?
Yes. Change the as-of date to see age at that point in time.
Does this include time of day?
No. It uses dates only, not hours, minutes, or time zones.
Note: Date math is based on calendar dates entered and does not account for time zones beyond the selected date.
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