Every Japanese learner meets 本 early as the word for "book," and then, a few lessons later, meets 本 again as a counter. It is almost irresistible to conclude that you count books with 本. You do not. Books — and every other bound volume — are counted with 冊（さつ）. This is one of the most satisfying "gotchas" in the language: the counter that looks like it should count books is the one counter that specifically does not. This page teaches 冊, its sound changes, and exactly why the 本 trap is so seductive.
What 冊 counts: things that are bound
冊 counts bound volumes — objects made of pages held together along a spine. That covers books (本), magazines (雑誌, zasshi), notebooks (ノート), dictionaries (辞書, jisho), textbooks (教科書, kyōkasho), comic volumes (漫画, manga), and picture books (絵本, ehon). The unifying image is a stack of pages you can flip through and shelve.
The kanji 冊 itself is a pictograph of bamboo or wooden writing-strips lashed together with a cord — the ancient East Asian "book" before paper. So 冊 has meant "a bound bundle of writing" for over two thousand years, which is a nice mnemonic: it is the binding counter.
図書館で本を三冊借りた。
toshokan de hon o san-satsu karita
I borrowed three books from the library.
新しいノートを一冊おろした。
atarashii nōto o issatsu oroshita
I started a fresh notebook.
この漫画、全部で八冊あるんだ。
kono manga, zenbu de hassatsu aru n da
This manga runs to eight volumes in all.
The readings — geminate at 1, 8, 10
冊 begins with an s (like 千 sen and 歳 sai), so it is subject to gemination: after 一, 八, and 十, the s doubles into っさ. But — and this is a genuine irregularity worth flagging — 冊 does not voice after ん. Compare 千, which becomes 三千 さんぜん sanzen (s → z), with 冊, which stays 三冊 さんさつ sansatsu. Same s, same ん before it, different outcome. There is no logic to derive here; it is simply that some s-counters voice and some don't, and 冊 is one that doesn't.
| Number | Reading | Note |
|---|---|---|
| 一冊 | いっさつ (issatsu) | gemination: doubled s |
| 二冊 | にさつ (ni-satsu) | — regular |
| 三冊 | さんさつ (san-satsu) | no voicing (not *sanzatsu*) |
| 四冊 | よんさつ (yon-satsu) | — regular |
| 五冊 | ごさつ (go-satsu) | — regular |
| 六冊 | ろくさつ (roku-satsu) | — regular (no gemination before s here) |
| 七冊 | ななさつ (nana-satsu) | — regular |
| 八冊 | はっさつ (hassatsu) | gemination: doubled s |
| 九冊 | きゅうさつ (kyū-satsu) | — regular |
| 十冊 | じゅっさつ / じっさつ (jussatsu / jissatsu) | gemination: doubled s |
| 何冊 | なんさつ (nan-satsu) | — regular |
夏休みに小説を十冊読んだ。
natsuyasumi ni shōsetsu o jussatsu yonda
I read ten novels over the summer break.
先月、本を何冊読みましたか。
sengetsu, hon o nan-satsu yomimashita ka
How many books did you read last month?
The 本 trap — the whole reason this page exists
Now the payoff. In Japanese, 本 as a noun means "book" (本を読む = "read a book"). But 本 as a counter means "long cylindrical things" — pens, bottles, umbrellas, trees — and it has nothing to do with books. To count books you must use 冊. So the sentence "I bought three books" is:
本を三冊買った。
hon o san-satsu katta
I bought three books. (本 the noun, 冊 the counter)
Look at that sentence carefully: the word 本 (book) and the counter 冊 sit side by side, and the counter is not 本. If you said 本を三本 (hon o san-bon), a Japanese listener would parse it as "three long thin cylinders called hon" — nonsense for books, and a giveaway that you've fallen for the trap.
Bound vs. loose: 冊 vs. 枚
The other boundary to guard is bound versus loose. 冊 requires binding — a spine, a cover, pages held together. A single loose sheet of paper, a printout, a flyer, or one page torn out is not a 冊; it is counted with 枚（まい）, the flat-thin-object counter.
| Object | Counter | Why |
|---|---|---|
| 本・ノート・雑誌 (book, notebook, magazine) | 冊 | bound along a spine |
| 紙・プリント・写真 (paper, handout, photo) | 枚 | a single flat sheet |
レポートをまとめて一冊にした。
repōto o matomete issatsu ni shita
I bound the report pages together into a single volume.
資料はプリント五枚とノート一冊です。
shiryō wa purinto go-mai to nōto issatsu desu
The materials are five printed sheets and one notebook.
That last sentence draws the line cleanly: the loose handouts are 枚, the bound notebook is 冊. For the flat-object counter in full, see 〜枚 (Flat Thin Things).
Register note
冊 is neutral and universal — you use it identically in casual conversation, in a bookshop, and in a library catalogue. There is no formal/informal split. The only nuance is that in very literary or bibliographic contexts you may meet 部（ぶ） for counting copies of a printed run (e.g. a print run of 初版五千部, "a first printing of five thousand copies"), which counts editions/copies rather than physical bound objects — but for the everyday "how many books," 冊 is always right.
このテーマなら、まずこの一冊を読むといいよ。
kono tēma nara, mazu kono issatsu o yomu to ii yo
For this topic, you'd do well to read this one book first.
Common mistakes
❌ 本を三本借りた。
Incorrect — the counter 本 is for long cylinders, not books; use 冊.
✅ 本を三冊借りた。
hon o san-satsu karita
I borrowed three books.
The headline error. The noun 本 (book) does not take the counter 本 (sticks). Books are 冊.
❌ 一冊 ＝ いちさつ
Incorrect — 冊 geminates after 一.
✅ 一冊 ＝ いっさつ
issatsu
one book/volume
❌ 八冊 ＝ はちさつ
Incorrect — 冊 geminates after 八.
✅ 八冊 ＝ はっさつ
hassatsu
eight books/volumes
❌ 三冊 ＝ さんざつ
Incorrect — over-applying 三千 sanzen's voicing; 冊 does not voice after ん.
✅ 三冊 ＝ さんさつ
san-satsu
three books/volumes
Because 三千 becomes sanzen, learners assume 三冊 becomes sanzatsu. It doesn't — 冊 keeps its s.
❌ プリントを一冊もらった。
Incorrect — a loose handout is a flat sheet; use 枚.
✅ プリントを一枚もらった。
purinto o ichi-mai moratta
I got one handout.
冊 needs binding. A single loose sheet is 枚.
Key takeaways
- 冊（さつ） counts bound volumes: books, magazines, notebooks, dictionaries, manga.
- Gemination hits 一冊 issatsu, 八冊 hassatsu, 十冊 jussatsu — same three numbers as before 千. 六冊 stays roku-satsu, and 三冊 does not voice (san-satsu, never sanzatsu).
- The counter 本 does not count books even though the noun 本 means "book." Books are 冊.
- A loose, unbound sheet is 枚, not 冊.
Now practice Japanese
Reading grammar gets you part of the way. The exercises are where it sticks — free, no signup needed.
Start learning Japanese→Related Topics
- 〜枚: Flat Thin ThingsN5 — The counter 枚 for flat, thin objects — paper, tickets, plates, shirts — and the relief that it is completely phonologically regular.
- 〜本: Long Cylindrical ThingsN5 — The counter 本 for long, thin, cylindrical things — pens, bottles, umbrellas, even phone calls and home runs — and its notorious three-way sound change いっぽん・さんぼん・ろっぽん.
- Counter Sound Changes: The Master PatternN4 — The two euphonic rules behind nearly all counter irregularity — gemination after 一/六/八/十 and voicing after 三/何 — laid out as one master grid across 本, 匹, 分, 階, 冊, and 杯.