Age calculator
Calculate age in calendar years, months and days, and find the next birthday.
Your results
Age calculator
Calculate calendar age between a birth date and a chosen reference date. See years, months, remaining days and the total number of days between the dates.
How to use this tool
- Choose a birth date and a reference date, then calculate the difference.
- Review the preview or settings, then create and check your result.
Available settings
- Date of birth
- Calculate on
Output and limitations
Calculate age in calendar years, months and days, and find the next birthday.
Dates use your local calendar. February 29 birthdays use February 28 in non-leap years.
How are leap-day birthdays handled?
Calendar months are clamped to the last available day, so February 29 uses February 28 in a non-leap year.
What if processing fails?
Check the supported formats and file limits, then try a smaller file. Keep an original copy. A clear error message will explain an unsupported input or an unavailable processing service.