Free online calculator
Age Calculator
Calculate exact age in completed years, months and days using valid Gregorian calendar dates.
Free calculator
Age Calculator
Enter your values to see the result.
Formula explained
Age is calculated by calendar-component subtraction, borrowing the correct number of days from the preceding month when required.
Worked example
Enter a birth date and an “age on” date to see completed years, remaining months and days plus total elapsed days.
Limitations and assumptions
The result uses calendar dates rather than time of birth. Legal age conventions for leap-day birthdays can vary by jurisdiction.
Frequently asked questions
Does this use my device timezone?
No. Dates are parsed as Gregorian calendar components to prevent timezone-related one-day errors.