Translation guide
In Japanese, expressing 'one book' depends on the type of book and context. The most common way is to use the counter 冊 (さつ) for bound volumes, but other counters apply for different formats. This guide covers counting books, referring to a single book, and related expressions.
一冊
one book (bound volume)
To say 'one book' when counting or specifying a single bound volume, such as a novel, textbook, or notebook.
The standard counter for bound books. Use this for most physical books.
この本を一冊ください。
Please give me one copy of this book.
彼は一冊の本を読んだ。
He read one book.
To say 'one book' when the item is a magazine, notebook, or other non-bound volume, where 冊 may not be appropriate.
Often still used for magazines and notebooks, though some may prefer other counters. 冊 is widely accepted for most book-like objects.
ノートを一冊買った。
I bought one notebook.
Used for copies of a publication, especially when emphasizing a single copy or issue. More formal or technical.
To say 'one book' when the focus is on the book as an object, not on the number, e.g., 'I have a book' or 'There is one book on the table'.
Literally 'one book's worth of book'. This is the most natural way to say 'one book' when the number is important but the noun is needed.
机の上に一冊の本がある。
There is one book on the desk.
Using the noun first with the counter after. Common in spoken Japanese.
本が一冊あります。
There is one book.
Noun directly followed by counter, without particle. Casual and common in conversation.
本一冊で十分だ。
One book is enough.
To specify 'one book' when referring to a single volume from a series or set.
Counter for volumes of a series. Use this for manga, novels, or any multi-volume work.
この漫画の一巻を読んだ。
I read volume one of this manga.
Also acceptable if the volume is a bound book, but 一巻 is more precise for volumes.
シリーズの一冊目を買った。
I bought the first book of the series.
To say 'one book' when referring to a digital book or e-book.
Even for digital books, 冊 is commonly used. It's the default counter for books regardless of format.
電子書籍を一冊ダウンロードした。
I downloaded one e-book.
Used in commercial or library contexts to count titles. Not common in everyday speech.
このサイトでは一タイトルから購入できます。
You can purchase from one title on this site.
To express that there is only a single book, or to emphasize the small number.
Adds emphasis on the small quantity. 'Only one book' or 'just one book'.
彼はたった一冊の本も持っていない。
He doesn't even have a single book.
Means 'only one book'. だけ is a particle meaning 'only'.
一冊だけ借りられます。
You can borrow only one book.
Do not say 'いちほん' (一本) for 'one book'. 本 (ほん) is the counter for long cylindrical objects, not books. Always use 冊 (さつ) for bound books.
In Japanese, counters usually come before the noun with の (e.g., 一冊の本) or after the noun with a particle (e.g., 本が一冊). Both are correct, but the former is slightly more formal.
昨日、本を一冊読んだ。
I read one book yesterday.
棚に本が一冊だけある。
There is only one book on the shelf.
I reserved one copy of this magazine.