〜本: Long Cylindrical Things

本（ほん）counts long, thin, cylindrical things — pens, bottles, umbrellas, trees, roads, ribbons, chopsticks-worth-of noodles. It is one of the first counters every learner meets, and also the one that produces more pronunciation errors than any other single counter in the language. That is because the reading of 本 shape-shifts three ways depending on the number in front of it: ほん / ぼん / ぽん. Master this one counter and you have effectively learned the entire counter sound-change system, because 本 exercises every rule at once. This page is built around that table.

What 本 counts

The core image is a stick or a stalk: something distinctly longer than it is wide. Once you have that picture, most of the vocabulary follows:

• Writing tools: ペン (pen), 鉛筆（えんぴつ, pencil）
• Drinks in a tall container: ビール (bottle of beer), ワイン, ジュース, 牛乳（ぎゅうにゅう, milk carton）
• Long thin objects: 傘（かさ, umbrella）, ネクタイ (necktie), ロープ (rope), バナナ
• Growing/standing long things: 木（き, tree）, 花（はな, a stem of a flower）
• Lines and routes: 道（みち, road）, 川（かわ, river）, 電車の路線（train line）

The sound-change table — the whole point of this page

Here is the table to memorise cold. The pattern is not random; it is the output of the two euphonic forces that run the entire counter system (explained in full on Sound Changes in Numbers):

• Gemination after 1, 6, 8, 10 — the number fuses into っ and h hardens to p: いっぽん, ろっぽん, はっぽん, じゅっぽん.
• Voicing after 3 and 何 (ん) — the h softens to b: さんぼん, なんぼん.
• Everything else (2, 4, 5, 7, 9) is quiet and keeps the base ほん.

Where English speakers go wrong: reading it all as ほん

Because the kanji 本 is famous (it also means "book," and nihon = 日本 "Japan"), learners default to pronouncing it ほん everywhere — ichi-hon, san-hon, roku-hon. Every one of those is wrong. There is no ichi-hon; it is ippon. There is no san-hon; it is sanbon. The written form gives you no warning, which is exactly why 本 has to be over-learned.

A pair of real-world anchors will cement the two hardest forms:

• 一本 = ippon is the word a judo referee shouts for a match-winning point — 「一本！」 You've probably heard it. Let that fix ippon in your ear.
• 六本 = roppon is hiding in the Tokyo district 六本木 (Roppongi), literally "six trees" (六本 roppon
  • 木 gi). Once you notice roppon inside Roppongi, you never say roku-hon again.

本 stretches to abstract "long" things

Here is what surprises learners most: 本 is not limited to physical sticks. Anything that is conceptually linear, extended, or drawn out takes 本 — and English has nothing like this metaphor. A phone call unspools like a line; a home run traces an arc; a film runs in a long strip. So:

• 電話（でんわ）a phone call → 一本 (a call "comes in" like a line)
• 映画（えいが）a film → 一本 (historically a reel of film)
• ホームラン a home run → 一本
• 電車の路線（ろせん）a train/subway line → 一本

A useful near-homophone: 二本 and 日本

二本 (two long things) is pronounced にほん nihon — segmentally identical to 日本 (Nihon, "Japan"). They are told apart by pitch accent and, overwhelmingly, by context: nobody hears ビールを二本 and thinks "beer of Japan." Mentioning it here just so the coincidence doesn't throw you when you meet it.

Common mistakes

The through-line: the number in front of 本 decides its sound. Don't read the kanji as ほん by reflex — check whether the number is a geminator (1/6/8/10 → p), a voicer (3/何 → b), or quiet (2/4/5/7/9 → h). For the master grid across all counters, see Counter Sound Changes; for a counter that gives your ears a rest, the perfectly regular 〜枚 is next door.

Key takeaways

• 本（ほん）counts long, thin, cylindrical things — pens, bottles, umbrellas, trees, roads — and by extension linear abstractions like phone calls, films, and home runs.
• It changes three ways: ぽ (ippon, roppon, happon, juppon) after 1/6/8/10, ぼ (sanbon, nanbon) after 3/何, and plain ほん after 2/4/5/7/9.
• Never read it flatly as ichi-hon or san-hon; the number dictates the sound.
• Anchor the hard forms with 一本 = ippon (judo) and 六本 = roppon (Roppongi).