Kazoedoshi & Longevity Age Calculator
From a birth date, see kazoedoshi (counted age) and full age, plus the years of kanreki, koki, kiju, sanju, beiju, sotsuju, hakuju and jūsan-mairi.
Examples (click to try)
Pick a birth date to see counted age and longevity years
How to use
Pick a birth date. You get today’s kazoedoshi and full age, the gap, and the calendar years of jūsan-mairi through hakuju. “Copy list” copies the table as text.
Kazoedoshi vs full age
Kazoedoshi counts the birth year as age 1 and adds a year every New Year. The formula is calendar year − birth year + 1; the birthday is unused. Full age increases only after the birthday, so the gap is 2 before the birthday and 1 on or after it.
Longevity years
- Jūsan-mairi — counted 13 (birth year + 12); a visit to Kokūzō Bosatsu
- Kanreki — counted 61 (birth year + 60); the sexagenary cycle returns to the birth year
- Koki 70, kiju 77, sanju 80, beiju 88, sotsuju 90, hakuju 99 (all counted ages)
Examples (as of 1 Feb 2026)
- Born 2 Apr 2014 — kazoedoshi 13, full age 11 (gap 2). Jūsan-mairi is 2026
- Born 1 Jan 2014 — kazoedoshi 13, full age 12 (gap 1)
- Born 15 Jun 1965 — kanreki year is 2025
Related tools
Unlucky ages: yakudoshi. Ages 3, 5 and 7: Shichi-Go-San. Baby rites: baby milestone dates.
FAQ
Is the birth date sent to a server?
No. Everything runs in your browser; nothing is transmitted or stored externally.
How is kazoedoshi calculated?
Kazoedoshi is the current calendar year minus the birth year, plus one. You are age 1 in the year you are born, and you gain a year every New Year — the birthday does not matter.
Why is the gap versus full age sometimes 2 and sometimes 1?
Full age increases only after the birthday. Before the birthday the gap is 2; on and after the birthday it is 1.
What age is kanreki?
Kanreki is counted age 61 (birth year + 60). Koki 70, kiju 77, sanju 80, beiju 88, sotsuju 90 and hakuju 99 are also counted ages. Jūsan-mairi is counted age 13 (birth year + 12).
Are yakudoshi and Shichi-Go-San also counted ages?
Traditionally yes. Many families now use full age. Check the year on the yakudoshi and Shichi-Go-San tools.