The Five Vowels | Japanese Grammar

Japanese has exactly five vowels, and they are the backbone of every word you will ever say. Compared with the fifteen-or-so vowel sounds of English, this is a gift. But the gift comes with one condition: each Japanese vowel is short, pure, and unchanging — no gliding, no diphthongs, no lazy reduction to "uh". If you say the five vowels cleanly and evenly, you have already fixed most of what makes a beginner sound foreign.

Five vowels, and that is the whole set

Kana	Rōmaji	IPA	English touchstone (imperfect)
あ	a	[a]	the a in father, but shorter and crisper
い	i	[i]	the ee in see, but short and with no glide
う	u	[ɯ]	like oo in food but with the lips relaxed, not pushed forward
え	e	[e]	the e in bet, but purer, with no ey off-glide
お	o	[o]	the o in for, but purer, with no ow off-glide

Notice that the touchstones are all labelled "imperfect". Every one of them is an English vowel that moves — English speakers slide see toward a y, and go toward a w, without noticing. Japanese vowels hold still. Think of each as a single held note, not a slide.

あい

a i

love — two pure vowels, a then i; not the English diphthong 'eye'.

うえ

u e

above / up — two clean beats, u then e, never fused into one sound.

大きい

ōkii

big — o held long (おお), then ki-i; every vowel gets full value.

The four easy ones: a, i, e, o

Four of the five vowels are close enough to English that you can get them right immediately if you keep them short and pure.

あ [a] — an open, bright "ah", as in 朝（あさ）"morning". Shorter than English father.
い [i] — a tight "ee", as in 犬（いぬ）"dog". Do not let it drift into English ih.
え [e] — a mid "eh", as in 駅（えき）"station". This is the one English speakers most often ruin by adding a y glide (see below).
お [o] — a rounded "oh", as in 音（おと）"sound". Keep the lips still; do not let it roll into ow.

朝ごはんを食べました。

asagohan o tabemashita

I ate breakfast. — 朝（あさ）'morning': a clean, short 'a'.

駅はどこですか。

eki wa doko desu ka

Where is the station? — 駅（えき）: pure [e], not 'ay-kee'.

犬がいます。

inu ga imasu

There's a dog. / I have a dog. — 犬（いぬ）: tight [i] then the tricky unrounded u.

The one to watch: う [ɯ]

Japanese う is the only vowel that is genuinely different from anything in English, and getting it wrong is an instant giveaway. English oo (as in food) is made with the lips pushed forward and rounded into a small circle. Japanese う is made with the lips relaxed, flat, even slightly compressed — the tongue is high and back like oo, but the lips do nothing.

The practical fix: start to say English "oo", then un-purse your lips until they are neutral and relaxed, keeping the tongue where it is. The result is a duller, more "swallowed" vowel. Linguists write it [ɯ] (unrounded) rather than [u] (rounded).

海が好きです。

umi ga suki desu

I like the sea. — 海（うみ）: lead with the flat, unrounded u, not a puckered 'oo'.

うたを歌います。

uta o utaimasu

I'll sing a song. — 歌（うた）'song': again the relaxed u.

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The unrounded う is also why Japanese u often seems to vanish. Between two voiceless consonants or at the end of a word, い and う frequently devoice — they are whispered rather than voiced. すき (suki) comes out close to "ski", and です (desu) close to "dess". This is normal, native pronunciation, not sloppiness. See Vowel Devoicing for the full picture.

No gliding: the "ey" and "ow" trap

This deserves its own section because it is the most stubborn English habit. In English, the "long e" of say is really e sliding into y ([eɪ]), and the "long o" of go is o sliding into w ([oʊ]). English speakers do this automatically and cannot hear themselves doing it.

Japanese え and お are monophthongs — single, steady positions. え is a held "eh" that never becomes "ey"; お is a held "oh" that never becomes "ow". If you say 駅（えき）and hear yourself glide toward a y, you are still speaking English. Freeze the vowel.

お茶をどうぞ。

ocha o dōzo

Here, have some tea. — the お in お茶 is a pure 'oh', held still.

ここに名前を書いてください。

koko ni namae o kaite kudasai

Please write your name here. — 名前（なまえ）ends na-ma-e: the final え is a clean, glide-free 'eh'.

Adjacent vowels stay separate

Because there are no diphthongs, when two vowels sit next to each other, each is pronounced fully and separately, as its own beat. English fuses vowel sequences into single glides; Japanese refuses to.

The word 青（あお）"blue" is a-o, two distinct beats — not a single "ow" sound. 上（うえ）"above" is u-e, two beats — not "way". This separateness is why counting beats works: あおい (aoi, "blue") is three morae, a-o-i, each vowel clear.

空が青いです。

sora ga aoi desu

The sky is blue. — 青い（あおい）is a-o-i, three separate vowel beats.

家に帰ります。

ie ni kaerimasu

I'm going home. — 家（いえ）'house' is i-e, two clean vowels, never one syllable.

The insight that fixes your accent: no schwa

Here is the deepest point on this page. English has a vowel called schwa — the colourless "uh" that unstressed syllables collapse into: the a in about, the o in lemon, the e in taken. English speakers reduce vowels to schwa constantly and unconsciously.

Japanese has no schwa. Every vowel, in every syllable, stressed or not, first or last, keeps its full, clear value. The word お母さん（おかあさん）"mother" is o-ka-a-sa-n — five clean vowels — not "uh-KAH-sun" with the outer vowels swallowed. When you resist the urge to reduce, and give the last vowel of a word exactly as much value as the first, you eliminate a huge slice of foreign accent in one move.

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If you fix one thing about your vowels, make it this: never let a vowel go grey. Give the final vowel of every word its full colour. English trains you to weaken word-final and unstressed vowels; Japanese needs every single one at full strength.

Common mistakes

駅

❌ ay-kee (glided 'ey')

Wrong: English adds a y-glide, turning [e] into 'ey'.

駅

✅ eki (pure [e], no glide)

Right: a steady 'eh', frozen in place — 'e-ki'.

音

❌ OH-toh (glided 'ow', stressed)

Wrong: gliding [o] toward 'ow' and stressing the first beat.

音

✅ oto (two pure, even vowels)

Right: 'o-to', both vowels held still and equal.

すし

❌ soo-shee (rounded 'oo')

Wrong: puckering the lips into an English 'oo' for う.

すし

✅ sushi (unrounded, u often whispered)

Right: flat, relaxed lips; the u is [ɯ] and may devoice.

あさ

❌ AH-suh (final vowel reduced to schwa)

Wrong: letting the final 'a' collapse into 'uh'.

あさ

✅ asa (both 'a' vowels full and clear)

Right: 'a-sa', the second 'a' as strong as the first.

上

❌ way (u and e fused into one glide)

Wrong: merging adjacent vowels into a single English diphthong.

上

✅ ue (two separate beats, u then e)

Right: 'u-e', each vowel its own clean mora.

Key takeaways

There are five vowels, each short and pure — hold each like a single steady note, never a slide.
The four easy vowels (a, i, e, o) are fine if you keep them crisp and glide-free: え is not "ey", お is not "ow".
う is unrounded — say "oo" with relaxed, un-pushed lips; it also devoices to a whisper between voiceless sounds.
Adjacent vowels stay separate — 青（あお）is two beats, not a diphthong.
Japanese has no schwa: give every vowel, especially the last one in a word, its full value.

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