Translation guide
In Japanese, expressing 'third class' depends heavily on context: it can refer to a rank, grade, tier, or category in systems like train travel, school years, or quality levels. The most common translations use 三等 (santō) for general ranking, or specific counters and suffixes like 三年 (sannen) for third year in school. Direct translation is often unnatural; instead, use the appropriate noun + number + counter/classifier pattern.
To refer to the third class in a hierarchical system like train tickets, ship cabins, or hotel categories.
The most direct and common translation for 'third class' in contexts like train travel, ship cabins, or seating categories. It is a noun that can be used attributively with の.
I rode in a third-class carriage.
Literally 'the third class', using 番目 (ordinal) and クラス (class). This is more descriptive and can be used when the system isn't formally named, but it's less natural than 三等 in established contexts.
To indicate the third year of school (elementary through high school) or third grade.
To describe a third-level rank in a proficiency test, martial arts belt system, or product quality tier.
Used for graded examinations (e.g., 英検, 漢検) or skill levels. Often paired with the test name.
To refer to the third category in a set of classes or types, such as in biology, library classification, or social strata.
Means 'the third type/kind'. Common in official classifications (e.g., 第三種郵便物 for third-class mail).
While クラス (class) is a loanword, it is not used in the same way as English 'class' for ranks or tiers. Saying サードクラス is not natural Japanese; use 三等 or the appropriate counter instead.
third-class carriage (not サードクラスカー)
三等 (santō) is a neutral term for third class in a system. 三流 (sanryū) means 'third-rate' and carries a negative connotation of inferior quality, similar to 'third-rate' in English. Do not use 三流 unless you intend to disparage.
Third-class cabins are the cheapest.
This train doesn't have a third class.
Standard term for a third-year student. Can be used for elementary, junior high, high school, or even college (though 三回生 is sometimes used for university).
He is a third-year junior high school student.
The third-grade classrooms are on the second floor.
Simply 'third year' or 'third grade', often used in compounds like 三年クラス (third-year class) or when the context is clear.
I'm the homeroom teacher for the third-year class.
Used specifically for third-year university students, though 三年生 is also common.
He is a third-year university student.
I passed the third level of the English proficiency test.
This product is third-class (quality).
Specifically for martial arts ranks (dan system). Third dan black belt.
He holds a third-degree black belt in judo.
This letter is third-class mail.
Used for 'third category' in scientific or formal classifications (e.g., chemicals, dangerous goods).
This medicine is a third-class drug.
あのホテルは三流だ。
That hotel is third-rate.