Every kanji has at least two ways to read it. Sometimes three. Sometimes ten. This is the single most confusing aspect of Japanese for new learners. But there are clear patterns — once you see them, it stops being random.
What Are On’yomi and Kun’yomi?
On’yomi (音読み) — The “Chinese reading.” Borrowed from Chinese pronunciation when kanji were imported to Japan ~1,500 years ago. Written in katakana in dictionaries.
Kun’yomi (訓読み) — The “Japanese reading.” The native Japanese word that was assigned to the Chinese character. Written in hiragana in dictionaries.
The Golden Rules
These rules work correctly about 80-90% of the time:
Rule 1: Compound words (jukugo) → On’yomi
When two or more kanji appear together with no hiragana in between, use the on’yomi reading.
| Compound | Reading | Meaning |
|---|---|---|
| 学生 | がくせい (gaku-sei) | Student |
| 電話 | でんわ (den-wa) | Telephone |
| 日本 | にほん (ni-hon) | Japan |
| 大学 | だいがく (dai-gaku) | University |
| 天気 | てんき (ten-ki) | Weather |
Rule 2: Kanji alone (or with okurigana) → Kun’yomi
When a single kanji stands alone or has hiragana attached (okurigana), use the kun’yomi reading.
| Word | Reading | Meaning |
|---|---|---|
| 山 | やま (yama) | Mountain |
| 食べる | たべる (ta-beru) | To eat |
| 大きい | おおきい (oo-kii) | Big |
| 水 | みず (mizu) | Water |
| 新しい | あたらしい (atara-shii) | New |
Visual Quick Reference
漢字 + 漢字 = On’yomi (usually)
漢字 alone = Kun’yomi (usually)
漢字 + hiragana = Kun’yomi (usually)
The Exceptions (And Why They’re Okay)
About 10-20% of words break these rules. The most common exceptions:
- 名前 (namae, “name”) — Two kanji, but kun’yomi
- 大人 (otona, “adult”) — Special reading (jukujikun)
- 今日 (kyou, “today”) — Special reading
Don’t try to memorize exception rules. Instead, learn words as whole units through flashcards. The patterns will become intuitive with exposure.
How Many Readings Should You Learn?
A common mistake is trying to memorize all readings of a kanji in isolation. Don’t do this. Instead:
- Learn the most common on’yomi (usually 1-2)
- Learn the most common kun’yomi (usually 1-2)
- Learn readings through vocabulary — not in isolation
When you learn the word 食べる (taberu, to eat), you automatically learn that 食 has the kun’yomi た (ta). When you learn 食事 (shokuji, meal), you learn the on’yomi ショク (shoku). No extra effort needed.
How Kanjijo Handles Readings
Kanjijo shows both on’yomi and kun’yomi on every kanji flashcard, clearly labeled. But more importantly:
- Each kanji card links to vocabulary words that use both readings
- You learn readings in context, not as isolated lists
- SRS ensures you’re tested on real vocabulary — not abstract readings
- Native audio lets you hear the correct pronunciation immediately
Practice: Which Reading?
Test yourself with these words:
| Word | Type | Answer |
|---|---|---|
| 山 | Single kanji | Kun: やま (yama) |
| 火山 | Compound | On: かざん (kazan) |
| 高い | Kanji + okurigana | Kun: たかい (takai) |
| 高校 | Compound | On: こうこう (koukou) |
| 出る | Kanji + okurigana | Kun: でる (deru) |
| 出口 | Compound | On: でぐち (deguchi)* |
*出口 is actually kun+kun — an exception! This is why learning through vocabulary matters.
Kanjijo teaches on'yomi and kun'yomi naturally through 6,000+ vocabulary words.