Age calculator
Completed years, leftover months and days. Useful for exams, visas, and Aadhaar-style forms.
Defaults to your region. Switch to compare any other scale.
Western completed-year age. Japan also uses this officially since 2022.
Result
30
Completed years
0 months, 0 days
- Total days10,957
- Next birthdaySunday, September 12
Formula
Years = completed birthdaysThen leftover months and days on the civil calendar
How it is calculated
- Enter the birth date and an as-of date (defaults to today).
- Count completed years, then months, then days.
- Next birthday is the next anniversary at or after as-of.
Questions
Kazoe vs completed years?
This page uses completed (Western) years. Traditional Japanese kazoe-doshi counts 1 at birth and adds a year every New Year — it is no longer the legal default.