Japanese Fifty Sounds - Long Vowel Kana Overview

The Japanese fifty-sound chart is the cornerstone of Japanese language learning, composed of different phonetic categories including seion (voiceless sounds), dakuon (voiced sounds), yōon (contracted sounds), sokuon (geminate consonants), and long vowels (chōon). Among these, long vowels (chōon) refer to the phonetic phenomenon of extending the vowel of a kana by one mora, and they hold an important position in the fifty-sound chart. In hiragana, long vowels are typically represented by repeating the vowel kana (e.g., "ああ," "いい," "うう," "ええ," "おお"), while in katakana they are represented using the long vowel mark "ー" (e.g., "アー," "イー," "ウー," "エー," "オー"). Unlike seion, dakuon, yōon, and sokuon, long vowels do not change the consonant itself but rather extend the vowel duration to distinguish word meanings. For example, the difference between "おばさん" (aunt) and "おばあさん" (grandmother) lies in the long vowel. This page collects basic long vowels and common vocabulary examples to help learners cross-reference with the fifty-sound chart and master the writing and pronunciation rules of long vowels.

📝 Long Vowel Hiragana

In the fifty-sound chart, the most common form of hiragana long vowels is the repetition of the same vowel kana: ああ (romaji aa, Unicode U+3042 U+3042), いい (ii, U+3044 U+3044), うう (uu, U+3046 U+3046), ええ (ee, U+3048 U+3048), おお (oo, U+304A U+304A). Unlike the single-syllable structure of seion and dakuon, long vowel hiragana are represented by two kana combining to express one extended syllable. In actual vocabulary, long vowels may be represented by an "a"-row kana followed by "あ," as in "おかあさん" (mother), or by an "o"-row kana followed by "う," as in "こうこう" (high school). Furthermore, like yōon and sokuon, long vowels are not listed separately in the fifty-sound chart but are an indispensable component of the Japanese pronunciation system. For consistency, this page primarily displays long vowel hiragana using repeated vowels.

🔤 Long Vowel Katakana

In the fifty-sound chart, katakana long vowels are uniformly represented using the long vowel mark "ー" (Unicode U+30FC, HTML entity ー). For example, アー (U+30A2 U+30FC), イー (U+30A4 U+30FC), ウー (U+30A6 U+30FC), エー (U+30A8 U+30FC), オー (U+30AA U+30FC). Unlike hiragana long vowels, which are represented by repeating vowels, katakana long vowels consistently use this symbol, a rule that contrasts sharply with the writing methods of seion, dakuon, yōon, and sokuon in the fifty-sound chart. Katakana long vowels are extremely common in loanwords, such as "コーヒー" (coffee), "テーブル" (table), "ノート" (notebook), and so on. The long vowel mark "ー" is rarely used in hiragana but may appear in some onomatopoeia or informal writing. Mastering the katakana long vowel rules is crucial for accurately spelling loanwords.

📌 Important Notes on Using Long Vowels

First, the romaji notation for long vowels typically repeats the vowel, such as aa, ii, uu, ee, oo, but in the Hepburn system, macrons (ā, ī, ū, ē, ō) are often used; this page adopts the repeated vowel form. Second, in hiragana long vowels, an "o"-row kana followed by "う" represents a long vowel (e.g., "とう" is read as too), while an "e"-row kana followed by "い" represents a long vowel (e.g., "せんせい" is read as sensee), which differs from repeated vowels and should be understood by cross-referencing with the pronunciation rules of seion and dakuon in the fifty-sound chart. Third, the katakana long vowel mark "ー" has Unicode U+30FC and is distinct from the Chinese numeral "一"; this distinction is important in programming. Fourth, when typing, long vowels can be input by repeating the vowel or by typing the long vowel mark (e.g., pressing the hyphen key in katakana mode). As with learning yōon and sokuon, correctly mastering the long vowel rules is crucial for Japanese pronunciation and spelling.

💡 Usage Tips

Click any long vowel card above to view detailed information and copy Unicode, romaji, HTML entities, or LaTeX commands with one click. Each long vowel example supports audio playback and downloading a 512×512 pixel transparent-background PNG image. It is recommended to study this page alongside the fifty-sound chart while reviewing seion, dakuon, yōon, sokuon, and other content to build a complete knowledge system of the Japanese fifty sounds. In web development, it is recommended to use UTF-8 encoding and specify a Japanese font (such as Noto Sans JP) to ensure proper display of long vowel marks. To input long vowels, you can repeat the vowel in romaji input (e.g., typing "ka"+"a" yields "かあ") or use the katakana long vowel mark.