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Ultimate Guide to Japanese Counter Sound Changes! Brute Force 1-10

# japanese # language
Harry
Lang
EN
Original 中文
日本語

Japanese counter words (助数詞 - じょすうし) are used to count different kinds of objects or events. Why do Japanese counters have sound changes? The sound changes in Japanese counters (「音便」) mainly stem from fluency of pronunciation and historical evolution. When numbers combine with specific counters, to make pronunciation smoother, some syllables undergo voicing (like 「ひき→びき」) or assimilation/gemination (like 「はち＋かい→はっかい」). These changes are not random, but follow predictable rules!

📌 Three main reasons for sound changes:

  1. Pronunciation efficiency: E.g. 「いち＋かい→いっかい」, skipping the pronunciation of 「ち」 makes it more fluent.
  2. Historical habits: Some sound changes are preserved from ancient Japanese pronunciation (like 「はつ→はっ」).
  3. Differentiating meaning: Avoiding ambiguity (like distinguishing between 「しち」 and 「はち」).

Note: This guide is divided into two modules

  1. Brute Force Enumeration: Lists all counters and sound changes for easy reference.
  2. Rule Summary: Summarizes some rules based on all counter sound change situations for easier memorization.

Numbers that undergo sound changes will be highlighted in bold.

Brute Force Enumeration

Counters that undergo sound changes

1.🍊 ～つ - General counter

This is the native Japanese counting method, which only goes up to 10. Commonly used when unsure which counter to use, or when counting abstract things.

Usage Rules:

  1. Imagine this: it has the most rhythmic pronunciation (like a beat). It’s not hard to remember.
  2. Traditional Japanese counting method, mainly used for small items up to 10 or abstract things (Example: One problem - 問題がひとつある).
  3. For 11 or more, “～個 (こ)” is typically used.

2. 📦 ～個 (こ) - Small items

Used to count small and round objects, or general items. Highly versatile.

Usage Rules:

  1. Used for relatively small, fixed-shape objects like apples, stones, boxes.
  2. When “～つ” cannot be used (11 or more), this counter is a great fallback.
  3. Consonant gemination (sokuon) often occurs after numbers 1, 6, 8, 10, 100.

3. 🙆‍♂️ ～人 (にん / り) - People

Used to count people.

Usage Rules:

  1. 1 and 2 people have special readings “ひとり” and “ふたり”.
  2. 4 people is read as “よにん” to avoid the inauspicious pronunciation of “しにん (dead person)”.
  3. 7 and 9 people have multiple readings, but “ななにん” and “きゅうにん” are more common.

4. 🐶～匹 (ひき / ぴき / びき) - Small animals, fish, insects

Used to count smaller animals like dogs, cats, fish, insects.

Usage Rules:

  1. Depending on the last syllable of the number, the counter reading changes between “ひき”, “ぴき”, “びき”.
  2. After numbers 1, 6, 8, 10: “～ぴき” (sokuon + semi-voiced).
  3. After number 3, and when asking “how many(何)”: “～びき” (voiced).
  4. After other numbers: “～ひき”.

5. 🐘 ～頭 (とう) - Large animals

Used to count large animals like cows, horses, elephants.

Usage Rules:

  1. Consonant gemination (sokuon) often occurs after numbers 1, 8, 10.

6. 🐦 ～羽 (わ / ば) - Birds, rabbits

Used to count birds and rabbits (because rabbit ears resemble wings).

Usage Rules:

  1. After number 3 and when asking “how many(何)”, read as “～ば” (voiced).
  2. Numbers 6, 8, 10 are sometimes read as “～っぱ”, but “～わ” is also used.
  3. “何羽” can be read as both “なんわ” and “なんば”.

7. ✏️ ～本 (ほん / ぽん / ぼん) - Long, thin objects

Used to count long and thin objects like pencils, bottles, trees, ties, movies (one film), trains (one run), home runs, etc.

Usage Rules:

  1. Similar to “～匹”, the counter reading changes between “ほん”, “ぽん”, “ぼん” depending on the number’s ending.
  2. After numbers 1, 6, 8, 10: “～ぽん” (sokuon + semi-voiced).
  3. After number 3, and when asking “how many(何)”: “～ぼん” (voiced).
  4. After other numbers: “～ほん”.

8. 📚 ～冊 (さつ) - Bound books

Used to count bound items like books, magazines, notebooks.

Usage Rules:

  1. Consonant gemination (sokuon) often occurs after numbers 1, 8, 10.

9. 🏢～階 (かい / がい) - Floors

Used to count the floors of a building.

Usage Rules:

  1. Consonant gemination (sokuon) often occurs after numbers 1, 6, 8, 10.
  2. After number 3 and when asking “which floor(何)”, read as “～がい” (voiced).

10. 🔁 ～回 (かい) - Times / Frequency

Used to count the number of times an event occurs.

Usage Rules:

  1. Similar to the sound changes of “～階”, but it does not become voiced after number 3.
  2. Consonant gemination (sokuon) often occurs after numbers 1, 6, 8, 10.

11. ☕️ ～杯 (はい / ぱい / ばい) - Cups, bowls

Used to count drinks (water, tea, beer) or food (rice) in cups or bowls. Squids and crabs also sometimes use this counter.

Usage Rules:

  1. Similar to the sound change rules for “～匹” and “～本”.
  2. After numbers 1, 6, 8, 10: “～ぱい” (sokuon + semi-voiced).
  3. After number 3, and when asking “how many(何)”: “～ばい” (voiced).
  4. After other numbers: “～はい”.

12. 🎂 ～歳 (さい) - Age

Used to count people’s age.

Usage Rules:

  1. Consonant gemination (sokuon) often occurs after numbers 1, 8, 10.
  2. Age 20 has a special reading “はたち” (written as “二十歳”).
  3. A more polite way to ask is “おいくつですか？“.

13. 👟 ～足 (そく / ぞく) - Pairs (shoes, socks)

Used to count pairs of footwear like shoes, socks, and Japanese tabi.

Usage Rules:

  1. Consonant gemination (sokuon) often occurs after numbers 1, 8, 10.
  2. After number 3 and when asking “how many pairs(何)”, read as “～ぞく” (voiced).

14. 👕 ～着 (ちゃく) - Clothes

Used to count clothes worn on the body like suits, dresses, coats. (Shirts can also use “～枚 まい”)

Usage Rules:

  1. Consonant gemination (sokuon) often occurs after numbers 1, 8, 10.
  2. Also used for race rankings (Example: 1着 - First place).

15. ⏱️ ～分 (ふん / ぷん) - Minutes

Used to count “minutes” of time.

Usage Rules:

  1. Depending on the last syllable of the number, the counter reading changes between “ふん” and “ぷん”.
  2. After numbers 1, 3, 4, 6, 8, 10, and when asking “how many(何)”: “～ぷん” (1,6,8,10 often have sokuon).
  3. After other numbers: “～ふん”.

16. 🕰️ ～時間 (じかん) - Hours

Used to count the duration of “hours”.

Usage Rules:

  1. 4 o’clock is read as “よじ”, and 9 o’clock is read as “くじ”, so 4 hours is “よじかん”, and 9 hours is “くじかん”.

17. 📅 ～日 (にち / か) - Days, Dates

Reading is relatively complex when counting the number of days or saying dates.

Number of days (Usually add “間 - かん” to indicate duration):

Dates:

Usage Rules:

  1. The 1st to the 10th basically use special native Japanese readings.
  2. The 14th, 20th, and 24th also have special readings.
  3. Other dates use the number reading plus “にち”.
  4. When expressing a duration of days, “～間 (かん)” is often added.

18. 📆 ～週間 (しゅうかん) - Weeks

Used to count the number of weeks.

Usage Rules:

  1. Consonant gemination (sokuon) often occurs after numbers 1, 8, 10.

19. 🈷️ ～ヶ月 (かげつ) - Months (Duration)

Used to count the duration in months. Also written as “～カ月” or “～箇月”.

Usage Rules:

  1. Consonant gemination (sokuon) often occurs after numbers 1, 6, 8 (when read as はっかげつ), 10.
  2. Different from counting the months of the year themselves like “ひとつき - one month, ふたつき - two months”.

20. 🎊 ～年 (ねん) - Years

Used to count the number of years.

Usage Rules:

  1. 4 years is read as “よねん”.
  2. 9 years can also be “くねん”, but “きゅうねん” is more common.

Counters without sound changes

For the following counters, no special sound changes generally occur after numbers (except for the numbers’ own special readings), making them relatively easy to remember.

21. 📄 ～枚 (まい) - Flat objects

Used to count thin and flat objects like paper, plates, shirts, CDs, photos.

Usage Rules:

  1. Pronunciation rules: basically no special sound changes.

22. 🚗 ～台 (だい) - Machines, vehicles

Used to count machines or vehicles with some volume that can be placed, like cars, bicycles, TVs, computers, beds, etc.

Usage Rules:

  1. Pronunciation rules: basically no special sound changes.

Quick Summary

The Sound Change Monsters are mainly 1, 3, 4, 6, 8, 9, 10 (4 and 9 are actually okay). Let’s break them down one by one.

Counters that undergo sound changes after 1, 6, 8, 10:

🎸 Please remember these four sound change kings!!! TLDR: Counters that undergo typical sokuon (gemination) or semi-voiced changes after the four numbers 1, 6, 8, 10 are: ～個 (こ), ～匹 (ひき), ～本 (ほん), ～階 (かい), ～回 (かい), ～杯 (はい), ～分 (ふん), ～ヶ月 (かげつ)

  1. ～個 (こ) - Small items
    • 1: いっこ
    • 6: ろっこ
    • 8: はっこ
    • 10: じゅっこ / じっこ
  2. ～匹 (ひき / ぴき / びき) - Small animals, fish, insects
    • 1: いっぴき
    • 6: ろっぴき
    • 8: はっぴき
    • 10: じゅっぴき / じっぴき
  3. ～本 (ほん / ぽん / ぼん) - Long, thin objects
    • 1: いっぽん
    • 6: ろっぽん
    • 8: はっぽん
    • 10: じゅっぽん / じっぽん
  4. ～階 (かい / がい) - Floors
    • 1: いっかい
    • 6: ろっかい
    • 8: はっかい
    • 10: じゅっかい / じっかい
  5. ～回 (かい) - Times
    • 1: いっかい
    • 6: ろっかい
    • 8: はっかい
    • 10: じゅっかい / じっかい
  6. ～杯 (はい / ぱい / ばい) - Cups, bowls
    • 1: いっぱい
    • 6: ろっぱい
    • 8: はっぱい
    • 10: じゅっぱい / じっぱい
  7. ～分 (ふん / ぷん) - Minutes
    • 1: いっぷん
    • 6: ろっぷん
    • 8: はっぷん
    • 10: じゅっぷん / じっぷん
  8. ～ヶ月 (かげつ) - Months (Duration)

    • 1 month: いっかげつ

    • 6 months: ろっかげつ

    • 8 months: はっかげつ (or はちかげつ)

    • 10 months: じゅっかげつ / じっかげつ

      Counters that partially undergo sound changes after 1, 6, 8, 10:

Counters that undergo sound changes after the number 3 (さん):

To sum up, the counters that undergo sound changes after the number 3 (さん) are:

These sound changes are mainly the voicing (changing to b, g, z sounds) or semi-voicing (changing to p sound) of the counter’s initial sound.

  1. ～匹 (ひき / ぴき / びき) - Small animals, fish, insects
    • 3: さんびき (ひき → びき)
  2. ～羽 (わ / ば) - Birds, rabbits
    • 3: さんば (わ → ば)
  3. ～本 (ほん / ぽん / ぼん) - Long, thin objects
    • 3: さんぼん (ほん → ぼん)
  4. ～階 (かい / がい) - Floors
    • 3: さんがい (かい → がい)
  5. ～杯 (はい / ぱい / ばい) - Cups, bowls
    • 3: さんばい (はい → ばい)
  6. ～足 (そく / ぞく) - Pairs
    • 3: さんぞく (そく → ぞく)
  7. ～分 (ふん / ぷん) - Minutes
    • 3: さんぷん (ふん → ぷん, this is semi-voicing, which is also a type of sound change)

Alright, let’s summarize the special pronunciation cases when the numbers 4 and 9 combine with counters.

The special readings for these two numbers are primarily to avoid homophones with inauspicious words (such as “death” and “suffering”), or due to habitual readings formed over history.

Summary of sound changes and special readings for the number 4 (四)

The number “four” usually has three readings when combined with counters: 「よん」, 「よ」, and 「し」. Among them, 「し」 is avoided in many cases because it sounds the same as “death (し)”.

  1. Cases where it is read as 「よ」 (Most special, needs memorization):
    • ～人 (にん): 4 people → よにん
      • This is to avoid the pronunciation of 「しにん」(dead person).
    • ～時 (じ) (Time point): 4 o’clock → よじ
      • Therefore, ～時間 (じかん) (Duration): 4 hours → よじかん
    • ～年 (ねん): 4 years → よねん
    • ～日 (か) (Date): 4th / 4 days → よっか - This is a native Japanese reading, not just 「よ」.
    • ～つ (General counter): 4 items → よっつ - Native Japanese reading.
  2. Cases where it is usually read as 「よん」 (More common):
    • When not falling into the special cases above, “four” is read as 「よん」 before most counters.
    • For example:
      • ～個 (こ): よんこ (Four)
      • ～匹 (ひき): よんひき (Four)
      • ～本 (ほん): よんほん (Four)
      • ～枚 (まい): よんまい (Four)
      • ～冊 (さつ): よんさつ (Four)
      • ～台 (だい): よんだい (Four)
      • ～階 (かい): よんかい (Four)
      • ～回 (かい): よんかい (Four)
      • ～杯 (はい): よんはい (Four)
      • ～歳 (さい): よんさい (Four)
      • ～足 (そく): よんそく (Four)
      • ～着 (ちゃく): よんちゃく (Four)
      • ～分 (ぷん): よんぷん (Four)
  3. Cases where it is read as 「し」:
    • Months: April (しがつ) Key to memory: Remember the special 「よ」 or native Japanese readings for 「よにん」, 「よじ(かん)」, 「よねん」, 「よっか」, 「よっつ」; most others are 「よん」.

Summary of sound changes and special readings for the number 9 (九)

The number “nine” usually has two readings: 「きゅう」 and 「く」. Because 「く」 sounds the same as “suffering (苦)”, it is replaced by 「きゅう」 in some cases, but there are also cases where 「く」 is the fixed reading.

  1. Cases where it is read as 「く」 (Specific, needs memorization):
    • ～時 (じ) (Time point): 9 o’clock → くじ
      • Therefore, ～時間 (じかん) (Duration): 9 hours → くじかん
    • ～日 (か) (Date): 9th / 9 days → ここのか - Native Japanese reading, not just 「く」.
    • ～つ (General counter): 9 items → ここのつ - Native Japanese reading.
  2. Cases where it is usually read as 「きゅう」 (More common, preferred):
    • When not falling into the special cases above, “nine” is read as 「きゅう」 before most counters. This is the more commonly used reading in modern Japanese to avoid association with “suffering”.
    • For example:
      • ～個 (こ): きゅうこ (Nine)
      • ～人 (にん): きゅうにん (Nine people) (The document also mentions くにん, but きゅうにん is more commonly used)
      • ～匹 (ひき): きゅうひき (Nine)
      • ～頭 (とう): きゅうとう (Nine)
      • ～羽 (わ): きゅうわ (Nine)
      • ～本 (ほん): きゅうほん (Nine)
      • ～枚 (まい): きゅうまい (Nine)
      • ～冊 (さつ): きゅうさつ (Nine)
      • ～台 (だい): きゅうだい (Nine)
      • ～階 (かい): きゅうかい (Nine)
      • ～回 (かい): きゅうかい (Nine)
      • ～杯 (はい): きゅうはい (Nine)
      • ～歳 (さい): きゅうさい (Nine)
      • ～足 (そく): きゅうそく (Nine)
      • ～着 (ちゃく): きゅうちゃく (Nine)
      • ～分 (ふん): きゅうふん (Nine)
      • ～週間 (しゅうかん): きゅうしゅうかん (Nine)
      • ～ヶ月 (かげつ): きゅうかげつ (Nine)
      • ～年 (ねん): きゅうねん (Nine) (The document also mentions くねん, but きゅうねん is more commonly used)
  3. Cases read as 「くにん」, 「くねん」:
    • For ～人 and ～年, nine can also be read as 「くにん」 and 「くねん」. However, 「きゅうにん」 and 「きゅうねん」 are more commonly used.

Key to memory: Remember the special 「く」 or native Japanese readings for 「くじ(かん)」, 「ここのか」, 「ここのつ」; for most other cases, 「きゅう」 is preferred.

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