Age Calculator
Instantly get age in years, Japanese counted age, zodiac, era name, school grade, and days to the next birthday from a birth date.
Compute
How to use
- Enter a date of birth as YYYY-MM-DD to get the age as of today.
- Besides age in years, it shows Japanese counted age (kazoedoshi), zodiac sign, era name (wareki), school grade, days until the next birthday, and whether the person is early-born.
- Results update as you type and are computed entirely in your browser.
FAQ
What is the difference between age and kazoedoshi?
Age counts birthdays reached; kazoedoshi counts you as 1 at birth and adds a year each New Year's Day.
How is the school grade determined?
By the age as of April 1 of that school year (which starts on April 1). Age 6 is grade 1, age 12 is junior-high year 1, age 15 is high-school year 1.
What does early-born mean?
A person whose birthday falls between January 1 and April 1 — relatively early within the same school cohort in Japan.
Is the calculation done on a server?
No. Everything is computed in your browser and no data is sent.