Japanese Age Calculator — 年齢計算
満年齢・数え年計算ツール — Calculate 満年齢 and 数え年
Calculate your Japanese age (満年齢) — the official age used on all Japanese
government forms and documents. Also shows traditional counting age (数え年),
your birth era, and days until your next birthday. Free, no login required.
Japanese Age Milestones (年齢の節目)
| Age |
Japanese |
Reading |
Meaning |
| 20 | 成人 | seijin | Coming of age — adult in Japan |
| 60 | 還暦 | kanreki | Full zodiac cycle complete |
| 70 | 古稀 | koki | Rare to reach 70 (from Chinese poetry) |
| 77 | 喜寿 | kiju | Joy of 77 |
| 80 | 傘寿 | sanju | 80th year |
| 88 | 米寿 | beiju | Rice celebration |
| 90 | 卒寿 | sotsuju | Graduation age |
| 99 | 白寿 | hakuju | White longevity |
| 100 | 百寿 | hyakuju | 100 years |
How to Calculate Japanese Age (満年齢の計算方法)
The Japanese age calculator uses your date of birth to compute your
current 満年齢 (man-nenrei) — the official Japanese age used on all
government forms, visa applications, contracts, and official documents
in Japan. 満年齢 works exactly like the Western age system: you are 0
at birth and your age increases by 1 on each birthday.
The calculator also shows your 数え年 (kazoedoshi) — the traditional
Japanese counting age. In this older system, everyone is born age 1
and gains a year on January 1st, not on their birthday. While
kazoedoshi is rarely used in official contexts today, it still appears
in traditional ceremonies, Buddhist rituals, and some regional customs.
Understanding Your Japanese Birth Era (生まれた元号)
Japan counts years using both the Western calendar and the imperial
era system (元号, gengō). The calculator shows which era you were
born in — whether Reiwa (令和, 2019–present), Heisei (平成, 1989–2019),
Showa (昭和, 1926–1989), Taisho (大正, 1912–1926), or Meiji (明治,
1868–1912). This is useful when filling out Japanese forms that ask
for your birth year in era format.
To convert between era years and Western years, use the
Japanese era date converter.
To find your Japanese zodiac sign, try the
Japanese zodiac calculator.
Age calculation follows Japanese law (年齢のとなえ方に関する法律,
1902). Era data sourced from the
Japan Cabinet Office.
Frequently Asked Questions
-
What is 満年齢 (man-nenrei) in Japan?
満年齢 (man-nenrei) is the official Japanese age system, equivalent
to the Western method of counting age. A person's age is 0 at birth
and increases by 1 on each birthday. It has been the legal standard
in Japan since 1902 and is used for all official documents, contracts,
and government purposes.
-
What is 数え年 (kazoedoshi) and how is it calculated?
数え年 (kazoedoshi) is the traditional Japanese age counting system.
A person is considered age 1 at birth, and age increases by 1 every
January 1st regardless of birthday. To calculate kazoedoshi: subtract
the birth year from the current year, then add 1. For example, someone
born in 2000 is kazoedoshi age 26 in 2025.
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How do I calculate my age for Japanese government forms?
Japanese government forms and official documents use 満年齢
(man-nenrei), which is the same as the Western age system. Enter
your date of birth in the calculator above to find your current
満年齢. The age shown is valid for any official Japanese document,
visa application, or government paperwork.
-
What are the special age milestones in Japan?
Japan has several traditional age milestones: 還暦 (kanreki) at
age 60 marks a full zodiac cycle; 古稀 (koki) at 70; 喜寿 (kiju)
at 77; 傘寿 (sanju) at 80; 米寿 (beiju) at 88; 白寿 (hakuju) at
99; and 百寿 (hyakuju) at 100. These are celebrated with special
ceremonies and are important cultural events in Japanese society.
-
What Japanese era was I born in?
Japan uses imperial era years (元号, gengō) alongside the
Western calendar. The current era is Reiwa (令和), which started
May 1, 2019. Before that was Heisei (平成, 1989–2019), Showa
(昭和, 1926–1989), Taisho (大正, 1912–1926), and Meiji
(明治, 1868–1912). Enter your date of birth in the Japanese age
calculator above to find your birth era instantly.