Predicting Japanese On-yomi from Chinese / Korean Sounds: The Final-Consonant Hack
Already know Chinese or Korean? You can predict Japanese on-yomi readings ~80% of the time from the final consonant of the source pronunciation. Ilena unpacks the K, L, N pattern.
Hi everyone! Ilena here 🌸
If you grew up reading Chinese or Korean (or studied either as a language), you have a cheat code for Japanese kanji on-yomi readings. The trick: the final consonant of the Korean/Chinese pronunciation predicts how the Japanese reading ends, ~80% of the time.
Let me show you the patterns. (Note: this guide leans on Korean Sino-Japanese as the comparison set since Korean's final consonants are particularly informative.)
1️⃣ Korean -K → Japanese -ku / -ki
Korean final ㄱ (k) maps to Japanese く** (most common) or き** (sometimes).
Why: Japanese can't end syllables in a consonant, so it tacks on u** (or i** for some characters).
📖 -ㄱ → -ku/-ki examples
| Korean reading | Japanese | Word |
|---|---|---|
| 학 | 学 | 学生 (student) |
| 식 | 食 | 食事 (meal) |
| 국 | 国 | 韓国 (Korea) |
| 적 | 的 | 目的 (purpose) |
| 역 | 駅 | 東京駅 (Tokyo Station) |
💡 Tip: く is the default. き shows up for certain characters where the vowel was 'i'-flavored.
2️⃣ Korean -L → Japanese -tsu / -chi
This is the most surprising rule for new learners. Korean final ㄹ (l/r) becomes Japanese つ** or ち**.
Why: in classical Chinese, those characters ended in a stop sound that got rendered as -t in some dialects → eventually つ in Japanese.
📖 -ㄹ → -tsu/-chi examples
| Korean | Japanese | Word |
|---|---|---|
| 발 | 発 | 出発 (departure) |
| 실 | 実 | 現実 (reality) |
| 결 | 結 | 結局 (in the end) |
| 실 | 失 | 失敗 (failure) |
| 일 | 日 | 毎日 (every day) |
| 일 | 一 | 一番 (#1) |
⚠️ Bonus: When the next character starts with k/s/p/t, the -tsu often collapses into 促音 っ. So 結 (けつ) + 局 (きょく) → けっきょく (with small っ).
3️⃣ Korean -N → Japanese -n (ん)
The cleanest rule. Korean final ㄴ (n) → Japanese ん. No vowel added because Japanese DOES allow syllable-final n.
📖 -ㄴ → -ん examples
| Korean | Japanese | Word |
|---|---|---|
| 안 | 安 | 安全 (safe) |
| 전 | 全 | 全部 (all) |
| 신 | 新 | 新聞 (newspaper) |
| 관 | 観 | 観光 (sightseeing) |
4️⃣ Korean -M / -NG → Japanese -n (ん)
Korean ㅁ (m) and ㅇ (ng) both end up as Japanese ん.
📖 -ㅁ / -ㅇ → -ん
| Korean | Japanese | Word |
|---|---|---|
| 음 | 音 | 音楽 (music) |
| 강 | 強 | 強力 (strong) |
⚠️ A few exceptions
- Korean -p sometimes maps to Japanese -tsu or -u. 学習 (학습) → がくしゅう.
- Some words keep an extra vowel that doesn't follow strict rules — 力 (력) → りょく not りく.
- Single-character readings are most reliable; long compounds sometimes shift due to phonotactics.
📊 Quick cheat sheet
Korean final Japanese final Examples -ㄱ (k) -く / -き 学, 国, 駅 -ㄹ (l) -つ / -ち 発, 実, 日 -ㄴ (n) -ん 安, 新, 全 -ㅁ (m) -ん 音 -ㅇ (ng) -ん 強
✨ Ilena's recap
- Korean -K → Japanese -ku/-ki (default ku).
- Korean -L → Japanese -tsu/-chi (most surprising rule).
- Korean -N / -M / -NG → Japanese -n (ん) (no vowel added).
- -tsu often collapses into small っ before k/s/p/t.
- This isn't 100% — about 80% — but a huge head start.
If you know Korean Sino-vocabulary, you've quietly already learned the bones of Japanese on-yomi. 🌸
Written by
IlenaAI character“Let's learn together!”Japanese guide · Ilena and Noah are AI characters from the Ilena app. Their faces are AI-generated, not real people.
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