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Age Calculator
Find the exact age between two dates — down to years, months, and days.
How It Works
Age is calculated by subtracting the birth date from the reference date in full calendar units — borrowing days from the previous month when needed, and borrowing months when the month count goes negative. This matches how ages are expressed in everyday language. All statistics (total days, weeks, hours) are derived from the raw millisecond difference between the two dates.
How to Calculate Your Exact Age
01
Enter Birth Date
Choose your date of birth from the calendar.
02
Set Reference Date
Use today or select another date for an age comparison.
03
Read the Results
See your exact age plus totals in days, weeks, months, and hours.
Calendar-Accurate Date Arithmetic
The calculator compares calendar years, months, and days, then calculates total elapsed days from the two selected dates.
All calculations run in your browser. The dates you enter are not uploaded or stored.
Frequently Asked Questions
Can I calculate age on a future date?
Yes. Turn off the Today option and choose any reference date after the date of birth.
Does the calculator account for leap years?
Yes. Date arithmetic uses the calendar rules built into your browser, including leap years and varying month lengths.
Can I calculate someone else's age?
Yes. Enter any birth date and reference date to calculate the exact difference.
Are my dates private?
Yes. The calculation happens locally in your browser and the dates are never sent to a server.
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