口 — “mouth / opening” in Japanese

Grade 1こう, く, くち

Radical ⼝ · radical 30 The building block this kanji is filed under

“mouth / opening” in Japanese is 口, read kou, ku, kuchi (こう, く, くち). It is a Grade 1 Kyōiku kanji, taught in year 1 of Japanese elementary school, and appears in words such as 入口 (entrance).

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What does 口 mean?

Full details, readings & example

Kanji	口
Meaning	mouth / opening
Readings	こう, く, くち
Grade	Grade 1 (Easiest)
Curriculum	Kyōiku kanji · Japanese elementary school
Example	入口 (entrance)

How to read 口

口 is read kou (こう) or ku (く) or kuchi (くち) depending on the word.

Words with 口

人口じんこう
入口
出口
口笛
窓口

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Kanji read the same way as 口

Same sound, different character — the classic trap. Compare them side by side:

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Updated: 2026-08-28