Japanese Long Vowels: The Complete Guide
Why is ็ (king) written ใใ but ๅคงใใ (big) written ใใ? Why is ๅ ็ ใใใใ but ใๅงใใ ใใญใใใ? And why does katakana use a dash instead? Long vowels are one system with a few spelling rules โ this guide covers all of them, plus the listening skill that makes ใใฐใใ and ใใฐใใใ two different people.
Why Long Vowels Matter
A long vowel in Japanese is simply a vowel held for two beats (two mora) instead of one. Japanese is a mora-timed language: every beat gets roughly equal time, and that extra beat is a real, meaning-carrying unit โ not decoration. Get the length wrong and you are saying a different word.
Learners face two separate problems. First, spelling: the same long โohโ sound can be written ใใ or ใใ, and the long โehโ can be ใใ or ใใ. Second, hearing: if your native language doesnโt use vowel length this way, your ears filter it out entirely. This guide handles both halves.
Learners who studied with romaji feel the spelling problem most. They see โลโ and have no way to know whether to write ใใ or ใใ. The good news: ใใ is the default for almost every word, and the ใใ words are a short, fixed list you can memorize in an afternoon.
The ใใ Rule (the default)
For the vast majority of words โ and almost all kango (kanji compounds) โ a long โohโ is written ใใ. Do not read it as โo-uโ; it is one long ล.
The ใใ Exceptions (memorize this list)
A small group of native Japanese words spells the long โohโ as ใใ. This is a leftover from older kana spelling. There are only a handful in common use โ learn them and you are done.
ใใ vs ใใ: The Sister Rule
The e-row works exactly the same way. The long โehโ is almost always written ใใ โ and pronounced as one long ฤ (not a crisp โe-iโ) โ especially in kanji compounds:
And just like ใใ, a tiny set of words spells it ใใ โ memorize the short list:
Bonus pattern: ใๅงใใ (ใใญใใใ, older sister) sits right next to ใๅ ใใ (ใใซใใใ, older brother), which lengthens with ใใ. Learn the family words as a set.
Katakana: One Mark for Everything โ ใผ
Katakana throws out all the rules above and replaces them with one mark: ใผ, the chลonpu (้ท้ณ็ฌฆ) or โlong-sound mark.โ It means โhold the previous vowel one more beat.โ So ใณใผใใผ is ko + (hold) + hฤซ: four beats, ko-o-hi-i.
The rule: in katakana, lengthen any vowel with ใผ โ never with ใใใใใ. Which syllables are long in a loanword follows the original foreign pronunciation, so you learn each word individually โ but the mark is always ใผ. (In vertical text it becomes a vertical line; same job.)
Long vs Short: Minimal Pairs Your Ears Must Learn
Call your friendโs ใใฐใใใ (grandmother) an ใใฐใใ (aunt / middle-aged lady) and youโll get a look. These pairs differ only in vowel length โ as different to a Japanese speaker as โshipโ and โsheepโ are to you:
How to Actually Hear It
- Clap the beats. ใ-ใฐ-ใใ is 4; ใ-ใฐ-ใ-ใใ is 5. Clap once per mora and the extra beat becomes physical.
- Say both out loud, back to back. Exaggerate the long one at first โ ใใผใผใซ โ then shrink it to normal.
- Train with audio, not text. You already โknowโ these words by spelling; the skill you need is hearing the length in real time. The JLPT listening section tests exactly this.
Common Mistakes
- Writing ใใ where ใใ belongs โ e.g. ในใใใใ โ for ๅๅผท (ในใใใใ โ).
- Reading ใใ as two separate vowels (โo-uโ) or ใใ as a crisp โe-iโ instead of one long vowel.
- Forgetting that the ใใ words exist and โcorrectingโ ใใใใ to ใใใใ โ.
- Leaving the ใผ out of loanwords: ใณใใผ โ instead of ใณใผใใผ โ โ the length change can make the word hard to understand.
- Using a hiragana-style vowel in katakana: ใณใผใใค โ โ katakana lengthens with ใผ, never with ใใช vowels.
Teacherโs Note
Donโt try to derive the exception words from a rule โ memorize the two short lists (ใใ: ๅคงใใ, ๅคใ, ้ ใ, ้ใ, ๆฐท, ๅ, ็ผโฆ / ใใ: ใๅงใใ, ใใ, ใธใ) and default to ใใ and ใใ for everything else. Typing on a computer actually helps: type the reading and watch which spelling converts to the kanji you want. And remember spelling is only half the skill โ knowing ็ is written ใใ only helps if your ears can also tell ล from o. Pair the rules with audio practice and you cover both halves.
Hiragana Guide โ
Read every kana
Katakana Guide โ
Loanword characters
JLPT Listening Tips โ
Train your ears
Hear the difference, donโt just read it
Nihongo Pass adds native audio to every word, so long and short vowels stop blurring together โ exactly what you need for the listening section.