On’yomi and kun’yomi: how to learn readings in context

What the two labels mean

On’yomi are readings derived historically from Chinese pronunciations adopted into Japanese at different times. Kun’yomi connect a character with native Japanese words that already expressed a related meaning. Because characters and pronunciations entered the language through several routes, one kanji may have multiple readings in either group.

The labels describe the history and behaviour of a reading; they do not tell you that one reading is “correct” and the other is optional. Which reading you need depends on the word you are reading.

A useful first prediction

Multi-kanji compounds often use on’yomi. 学生 is read がくせい, using the on’yomi がく for 学 and せい for 生. A standalone kanji or a kanji followed by hiragana that completes a Japanese word often uses kun’yomi. 書く is read かく, with 書 carrying か and the hiragana く completing the verb.

This prediction is a starting point, not a law. 今日 is read きょう rather than a simple combination of the most obvious readings for 今 and 日. Names, counters, sound changes, and long-established vocabulary create many exceptions.

• Compound of two or more kanji: try the familiar on’yomi-based word first.
• Kanji with okurigana: look for a matching kun’yomi vocabulary form.
• Known exception or special reading: learn the whole word as one unit.

Do not memorise every reading equally

A reference entry may list readings that are uncommon in modern everyday vocabulary. Giving all of them equal study time creates a large memory burden without improving practical reading. Start with the reading found in a common word appropriate to your level.

When a second word introduces another reading, add it as a word-level memory. This creates evidence for when each sound is used. Over time, patterns emerge naturally: you recognise that 学 is がく in 学校 and 学生, while 学ぶ uses まなぶ.

How to review a failed reading

When you miss a reading, avoid staring at the answer and immediately rating it as learned. Say the complete word, check its meaning, hide it, and try again after another card. On the next day, prompt with the written word rather than the isolated kanji.

If two readings compete, write one familiar example beside each. The contrast gives the reading a context: 日 in 毎日 (まいにち) versus 日 in 日 (ひ). The goal is not to recite a database entry; it is to read words accurately.