Japanese Era & Age Calculator
Convert a birthdate to Japanese era (wareki), calculate age, upcoming birthday, and school year based on the Japanese academic calendar.
* School year is calculated using the Japanese academic calendar (April 2 – April 1 of the following year).
* All calculations run in your browser—no data leaves the page.
What you can calculate
- Japanese era name and year alongside the Western calendar
- Current age, months lived, zodiac sign, and school grade
- Days until the next birthday with the exact event date
Where it helps
Use it when preparing resumes, pension and insurance paperwork, or helping family members interpret official documents. All calculations run locally, so personal data never leaves your browser.
Notes
School grade outputs follow the Japanese academic year (April start). Adjust the interpretation if your organisation uses a different academic calendar.
Zodiac results use the Gregorian calendar. For rituals that rely on the lunar calendar, verify the zodiac sign against an official lunisolar reference.