The core image: filled to the top
Ippai combines ichi, one, with hai, a cup. Something ippai is full the way a cup is full, with no room left, and every other use grows out of that picture.
In writing, the literal one cup usually appears as 一杯, while the looser meanings of full and lots are often written in hiragana as いっぱい.
| Japanese | Romaji | Meaning |
|---|---|---|
| 一杯 | ippai | One cup, one glass |
| いっぱい | ippai | Full, lots of |
| コップがいっぱいです。 | Koppu ga ippai desu. | The glass is full. |
Onaka ippai: I am full
The phrase every learner needs at a dinner table. Onaka is stomach, so onaka ippai is a full stomach. Adding mō makes it a gentle way to refuse more food.
It pairs naturally with a compliment, so the host hears that you stopped because you were full, not because you disliked the food.
| Japanese | Romaji | Meaning |
|---|---|---|
| お腹いっぱいです。 | Onaka ippai desu. | I'm full. |
| もうお腹いっぱいです。 | Mō onaka ippai desu. | I'm already full, thank you. |
| おいしかったです。お腹いっぱいです。 | Oishikatta desu. Onaka ippai desu. | That was delicious. I'm full. |
| お腹いっぱい食べた。 | Onaka ippai tabeta. | I ate until I was full. (casual) |
Ippai as lots of
In casual speech, ippai means a lot or lots of, and often suggests somewhere filled or crowded. Children and friends use it constantly.
In polite speech, takusan or ōku no is usually the better fit, and ippai can sound a little childlike in formal settings.
| Japanese | Romaji | Meaning |
|---|---|---|
| 人がいっぱいいる。 | Hito ga ippai iru. | There are loads of people. (casual) |
| 電車が人でいっぱいでした。 | Densha ga hito de ippai deshita. | The train was packed. |
| 宿題がいっぱいある。 | Shukudai ga ippai aru. | I've got loads of homework. (casual) |
| たくさんの人が来ました。 | Takusan no hito ga kimashita. | Many people came. (neutral) |
One cup: the hai counter
As a counter, hai counts cups, glasses and bowlfuls. Its sound changes after certain numbers, which is the part learners get wrong most often.
Chotto ippai is also a set phrase for a quick drink after work, whether or not it really stops at one.
| Japanese | Romaji | Meaning |
|---|---|---|
| コーヒーを一杯ください。 | Kōhī o ippai kudasai. | One coffee, please. |
| ビールを二杯お願いします。 | Bīru o nihai onegaishimasu. | Two beers, please. |
| ちょっと一杯行かない？ | Chotto ippai ikanai? | Fancy a quick drink? (casual) |
| もう一杯いかがですか。 | Mō ippai ikaga desu ka. | Would you like another glass? |
| Number | Reading | Note |
|---|---|---|
| One | Ippai | Sound changes to pai |
| Two | Nihai | Regular |
| Three | Sanbai | Sound changes to bai |
| Four | Yonhai | Regular |
| Six | Roppai | Sound changes to pai |
| Eight | Happai | Sound changes to pai |
| Ten | Juppai | Sound changes to pai |
| How many | Nanbai | Sound changes to bai |
Ippai ippai: at your limit
Doubling the word pushes the image past full: the cup is overflowing. Ippai ippai means you are stretched to the limit, whether with work, money or emotion.
It is a useful, honest way to decline extra work without sounding lazy, because it describes your capacity rather than your willingness.
| Japanese | Romaji | Meaning |
|---|---|---|
| 今、いっぱいいっぱいです。 | Ima, ippai ippai desu. | I'm at my limit right now. |
| 自分のことでいっぱいいっぱい。 | Jibun no koto de ippai ippai. | I've got my hands full with my own things. (casual) |
Sei ippai and time limits
Sei ippai means with all your strength, doing as much as you possibly can. It is a humble, sincere way to commit to effort.
Ippai after a time word means right up to the end of that period, which shows up in resignations, sales and deadlines.
| Japanese | Romaji | Meaning |
|---|---|---|
| 精一杯頑張ります。 | Sei ippai ganbarimasu. | I'll do my very best. |
| 今月いっぱいで辞めます。 | Kongetsu ippai de yamemasu. | I'm leaving at the end of this month. |
| セールは今週いっぱいです。 | Sēru wa konshū ippai desu. | The sale runs until the end of this week. |
Keeping the uses straight
Once you see the full cup behind every use, ippai stops feeling like several unrelated words. The counter sounds are the only part that needs deliberate drilling.
Unihongo's learn-by-playing vocabulary games help keep words like sei ippai and onaka ippai fresh, while ordering drinks in a roleplay is what fixes the counter sounds in your mouth.
- Onaka ippai for full, with mō to decline more.
- Takusan rather than ippai in polite speech.
- Ippai, nihai, sanbai for glasses and cups.
- Ippai ippai for at your limit; sei ippai for your best effort.