KoguNavi

Age Calculator

Enter a birth date and reference date to see practical Japanese age details, including a copy-friendly education history year table.

Conversion tools

What it helps with

  • Check age for Japanese forms
  • See kazoedoshi and zodiac quickly
  • Estimate school-year timing for a child
  • Prepare education history years for a Japanese resume

How to use

  1. Enter a birth date using the calendar picker or manual YYYY-MM-DD input.
  2. Choose a reference date, or use today.
  3. Optionally add gap years before university or repeat / leave years.
  4. Calculate and review full age, kazoedoshi, zodiac, school-year hints, education history years, and milestones.

Examples

Before birthday

Input

2000-07-10 | 2026-07-05

Output

Full age: 25

After birthday

Input

2000-07-10 | 2026-07-10

Output

Full age: 26

School year hint

Input

2018-04-02 | 2025-04-10

Output

Elementary grade 1

Resume education years

Input

2000-04-02 | 2026-07-05

Output

Elementary school: 2007 entry / 2013 graduation

Good to know

  • School year, yakudoshi, and longevity celebrations are practical estimates.
  • University years assume a typical 4-year path unless you add gap or repeat years.
  • Local school paths, customs, and official form rules can vary.
  • This tool is not legal, medical, or administrative advice.

FAQ

Does this calculate kazoedoshi?
Yes. It shows both full age and kazoedoshi for the selected reference year.
Are school year results official?
No. They are practical estimates based on the common Japanese April 2 cutoff and April school year.
Can this prepare resume education history years?
Yes. It shows elementary through university entry and graduation years as a copy-friendly estimate.
Are the dates uploaded?
No. The calculation is designed to run in your browser for this tool.

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