年齢計算機
国際式、韓国式、年ベースのシステムを使って年齢を計算します。
Overview
Three age systems coexist in East Asia, and they can disagree by two years for the same person on the same day. International age counts completed years and increments on the birthday. Korean counting age (세는나이) starts at one on the day of birth and advances every 1 January. Korean year age (연나이) is the bare calendar-year difference, with no birthday check at all.
国際年齢
歳
韓国式年齢
歳
年度年齢
歳
生存日数
次の誕生日まで
日
年齢システム
| 方式 | 説明 |
|---|---|
| 国際式 | 誕生日ごとに年齢が増える |
| 韓国式 | 生まれた時点で1歳、毎年1月1日に増える |
| 年度年齢 | 生まれた年を現在の年から引く |
How to Use
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1
Enter your birth date
Select your date of birth, and optionally a target date to calculate age as of that day.
-
2
Choose the counting system
Compare international age with Korean, Vietnamese, Japanese, or Chinese age-counting systems.
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3
Read your exact age
Your age in years, months, and days — plus total days lived — is calculated instantly.
About
South Korea adopted international age as its legal standard in June 2023, so statutes, contracts and medical records now use completed years unless a provision says otherwise. Counting age survives in conversation, where relative age governs speech level and forms of address, and year age remains the basis for conscription screening, school entry and the Youth Protection Act — rules administered by birth year rather than by birth date.
Vietnamese tuổi mụ and the traditional Japanese kazoedoshi follow the same ordinal logic as Korean counting age, which is why a Korean, a Vietnamese and a Japanese record of the same birth year can each report a different number.