onakagasuku-vs-onakagaippai

How do you say “I’m hungry” and “I’m full” in Japanese? These two expressions — お腹が空く (onaka ga suku) and お腹がいっぱい (onaka ga ippai) — are essential for anyone eating out, visiting a Japanese family, or simply having a meal-time conversation. They look similar but work very differently grammatically. This guide breaks them down with natural examples and explains the nuances English speakers often miss.

Yuka

Hey Rei, what’s the best way to remember the difference between onakagasuku and onakagaippai?

Rei

The best trick is to associate each word with a strong image or situation. By the end of this article you’ll have one for each — promise!

At a Glance

Key insight: お腹が空く uses a verb (空く, to become empty), so it naturally describes a process or state change. お腹がいっぱい uses いっぱい (an adjective meaning “full/stuffed”), describing a current state.

What Does お腹が空く (Onaka ga Suku) Mean?

お腹が空く (おなかがすく) literally means “my stomach becomes empty” and is used to express hunger. The verb 空く (suku) means “to become empty/vacant.” The expression can describe both a current state and a process of becoming hungry.

Register variations:

Example 1

お腹空いたー！
Onaka suita!
I’m hungry!

Example 2

お腹が空いてきました。
Onaka ga suite kimashita.
I’m getting hungry.

Example 3

お腹空いてますか？
Onaka suite masu ka?
Are you hungry?

Example 4

さっき食べたのにもうお腹すいてきたよ。
Sakki tabeta noni mō onaka suite kita yo.
Even though I just ate, I’m already getting hungry again.

What Does お腹がいっぱい (Onaka ga Ippai) Mean?

お腹がいっぱい (おなかがいっぱい) literally means “my stomach is full” and is used to express being full / satisfied after eating. The word いっぱい means “full” or “lots of.” Unlike お腹が空く, this is an adjective construction rather than a verb — it describes a current state.

Register variations:

Example 1

お腹いっぱいー！
Onaka ippai!
I’m stuffed!

Example 2

お腹がいっぱいになってきました。
Onaka ga ippai ni natte kimashita.
I’m getting full.

Example 3

お腹いっぱいですか？
Onaka ippai desu ka?
Are you full?

Example 4

さっき食べたからお腹いっぱいだよ。
Sakki tabeta kara onaka ippai da yo.
I ate a while ago, so I’m full.

Hungry vs. Full: Side-by-Side Comparison

Grammar note for English speakers: English says “I am hungry / I am full” — both with the verb “to be.” Japanese is different: hunger uses a VERB (空く), while fullness uses an ADJECTIVE (いっぱい). This is why the conjugation patterns look different for each expression.

Related Food and Appetite Expressions

腹ペコだ！
Harapeko da!
I’m starving! (Very casual — often used by children or in playful speech)

満腹です。
Manpuku desu.
I’m full. (Slightly more formal than お腹がいっぱいです)

Decision Flowchart: Which Expression to Use?

Are you talking about hunger or fullness?
              |
              Yes
              |
Do you want to eat? (Your stomach feels empty?)
       |                    |
      Yes                   No
       |                    |
お腹が空く             Has your stomach become full after eating?
(onaka ga suku)              |                    |
= I'm hungry               Yes                   No
                             |                    |
                     お腹がいっぱい          → Maybe: 食欲がない
                  (onaka ga ippai)               (no appetite)
                  = I'm full

Register reminder: In daily casual conversation, most Japanese speakers drop the が (ga particle) and say お腹すいた and お腹いっぱい without it. The full forms お腹が空いています and お腹がいっぱいです are used in more polite or written contexts.

Quick Quiz: Fill in the Blank

Choose お腹が空く (hungry) or お腹がいっぱい (full) — or their variants — for each sentence. Answers below.

Q1. もうお＿＿すいたよ。まだ昼ごはんまで時間があるのに。
I’m already _____. Even though there’s still time until lunch.

Q2. たくさん食べたのでお腹が＿＿です。
I ate a lot so I’m _____.

Q3. お腹が＿＿てきたから、そろそろ食べよう。
I’m getting _____, so let’s eat soon.

Q4. お腹＿＿ですか？もう少し食べませんか？
Are you _____? Won’t you eat a little more?

Q5. 朝ごはんを食べなかったので、もうお腹が＿＿います。
Because I didn’t eat breakfast, I’m already _____.

Answers:

A1. 腹 (お腹すいた) — Feeling empty, wanting to eat → お腹すいた。

A2. いっぱい (お腹がいっぱい) — After eating a lot, stomach is full → お腹がいっぱいです。

A3. 空い (空いてきた) — Progressive hunger (“becoming hungry”) → お腹が空いてきたから、そろそろ食べよう。

A4. いっぱい (お腹いっぱい) — Asking if someone is full → お腹いっぱいですか？

A5. 空いて (空いています) — Current state of hunger → お腹が空いています。

Summary

These are two of the most frequently used expressions at the dinner table in Japan. Master both, and you will be able to handle every meal-time conversation with ease.

Also read:

あわせて読みたい

anzen-vs-kiken How do you say "safe" and "dangerous" in Japanese? 安全 (anzen) and 危険 (kiken) are essential vocabulary for travel, daily conversation, and understanding J...

＼ Learn Japanese with a personal native teacher!／

あわせて読みたい

suki-vskirai Two of the first Japanese words learners pick up are すき (suki) and きらい (kirai) — "like" and "dislike." They seem straightforward at first, but these wor...