Japanese Counting System: A Complete Guide to Counters

The Japanese counting system is one of the most challenging aspects of the language for learners. Unlike English, where you can say “three cats” or “five books” using the same number format, Japanese requires a specific counter suffix for each type of object. You say 三匹 (san-biki) for three small animals, 三本 (san-bon) for three long cylindrical objects, and 三枚 (san-mai) for three flat objects. Using the wrong counter marks you clearly as a non-native speaker.

This guide covers the Japanese counting system from the ground up. You will learn the basic numeral readings, the universal hitotsu/futatsu system, the most common counters with their irregular readings, effective practice strategies, and how to avoid the most frequent mistakes learners make.

The Basic Number System

Before you can use counters, you must know the core Japanese numerals. There are two parallel number systems: the native Japanese readings (hitotsu, futatsu, mitsu…) and the Sino-Japanese readings (ichi, ni, san…). Counters primarily use the Sino-Japanese system, but some use the native system exclusively.

Sino-Japanese Numbers (Go-on / Kan-on Readings)

These readings come from Chinese and are used for most counters and compound numbers:

Number	Reading	Number	Reading
0	zero / rei	6	roku
1	ichi	7	shichi / nana
2	ni	8	hachi
3	san	9	kyuu / ku
4	shi / yon	10	juu
5	go	100	hyaku

Note that 4 can be read as shi or yon, and 7 as shichi or nana. In counters, yon and nana are preferred because shi also means “death” and shichi can be confused with ichi in rapid speech.

Native Japanese Numbers (Yamato-kotoba)

These are used for the generic tsu counter and in some traditional counting contexts:

Number	Reading	Number	Reading
1	hitotsu	6	muttsu
2	futatsu	7	nanatsu
3	mittsu	8	yattsu
4	yottsu	9	kokonotsu
5	itsutsu	10	too

The native system only goes up to 10. Beyond that, Sino-Japanese numbers are used.

The Universal Tsu Counter

The tsu counter is the most versatile counter in Japanese. It can be used for almost any object when you do not know the specific counter, making it a useful fallback for learners.

Tsu Counter Readings

一つ (hitotsu)
二つ (futatsu)
三つ (mittsu)
四つ (yottsu)
五つ (itsutsu)
六つ (muttsu)
七つ (nanatsu)
八つ (yattsu)
九つ (kokonotsu)
十 (too)

Beyond ten, you use Sino-Japanese numbers with the つ reading dropped. For example, 十一 (juu-ichi) for eleven items.

The tsu counter is particularly useful when shopping or speaking casually. If you forget the specific counter for an object, adding つ to a native number will usually be understood. However, for JLPT exams and formal contexts, knowing the correct counters is expected.

The Most Common Japanese Counters

There are dozens of Japanese counters, but you only need to master about 20-25 for JLPT N3 and above. Here are the most essential ones organized by category.

People Counter: 人 (nin)

一人 (hitori) — one person 二人 (futari) — two people 三人 (san-nin) — three people 四人 (yo-nin) — four people 五人 (go-nin) — five people 六人 (roku-nin) — six people 七人 (shichi-nin / nana-nin) — seven people 八人 (hachi-nin) — eight people 九人 (kyuu-nin) — nine people 十人 (juu-nin) — ten people

Note the irregular readings for one and two people: hitori and futari, not ichi-nin and ni-nin. These two exceptions are very common and must be memorized separately.

Flat Objects: 枚 (mai)

This counter is used for flat, thin objects like paper, photographs, plates, sheets, shirts, and stamps. It has no irregular readings, making it one of the easiest counters:

一枚 (ichi-mai), 二枚 (ni-mai), 三枚 (san-mai), 四枚 (yon-mai), 五枚 (go-mai), 六枚 (roku-mai), 七枚 (nana-mai), 八枚 (hachi-mai), 九枚 (kyuu-mai), 十枚 (juu-mai)

Long Cylindrical Objects: 本 (hon)

This counter is used for long, thin objects: pens, bottles, trees, pencils, umbrellas, legs, and rivers. The readings change due to consonant voicing:

一本 (ip-pon) — one 二本 (ni-hon) — two 三本 (san-bon) — three 四本 (yon-hon) — four 五本 (go-hon) — five 六本 (rop-pon) — six 七本 (nana-hon) — seven 八本 (hap-pon / hachi-hon) — eight 九本 (kyuu-hon) — nine 十本 (jup-pon / ju-pon) — ten

The irregular readings (ip-pon, san-bon, rop-pon, hap-pon, jup-pon) are caused by the consonant changes that occur when certain numbers combine with the H-sound of hon. This pattern of sound changes (called rendaku or sequential voicing) appears in many counters.

Small Animals: 匹 (hiki)

This counter is used for small animals like cats, dogs, fish, insects, and most pets:

一匹 (ip-piki) — one 二匹 (ni-hiki) — two 三匹 (san-biki) — three 四匹 (yon-hiki) — four 五匹 (go-hiki) — five 六匹 (rop-piki) — six 七匹 (nana-hiki) — seven 八匹 (hap-piki) — eight 九匹 (kyuu-hiki) — nine 十匹 (jup-piki) — ten

The same consonant voicing patterns occur: ip-piki, san-biki, rop-piki, hap-piki, jup-piki.

Large Animals: 頭 (tou)

This counter is used for large animals: cows, horses, elephants, whales, and other sizable creatures. It literally means “head”:

一頭 (ichi-tou), 二頭 (ni-tou), 三頭 (san-tou), etc. No irregular readings.

Machinery and Vehicles: 台 (dai)

This counter is used for machines, vehicles, computers, electronics, and appliances:

一台 (ichi-dai), 二台 (ni-dai), 三台 (san-dai), etc. No irregular readings.

Books and Bound Objects: 冊 (satsu)

This counter is used for books, magazines, notebooks, and other bound materials:

一冊 (is-satsu) — one 二冊 (ni-satsu) — two 三冊 (san-satsu) — three 四冊 (yon-satsu) — four 五冊 (go-satsu) — five 六冊 (roku-satsu) — six 七冊 (nana-satsu) — seven 八冊 (has-satsu) — eight 九冊 (kyuu-satsu) — nine 十冊 (jus-satsu) — ten

Again, consonant changes: is-satsu, has-satsu, jus-satsu.

Cups and Glasses: 杯 (hai)

This counter is used for cupfuls, glassfuls, and bowlfuls of liquid. It also extends to servings of food and drinks in bowls:

一杯 (ip-pai), 二杯 (ni-hai), 三杯 (san-bai), 四杯 (yon-hai), 五杯 (go-hai), 六杯 (rop-pai), 七杯 (nana-hai), 八杯 (hap-pai), 九杯 (kyuu-hai), 十杯 (jup-pai)

Floors/Levels: 階 (kai)

This counter is for building floors and levels:

一階 (ik-kai), 二階 (ni-kai), 三階 (san-kai / san-gai), 四階 (yon-kai), 五階 (go-kai), 六階 (rok-kai), 七階 (nana-kai), 八階 (hak-kai), 九階 (kyuu-kai), 十階 (juk-kai)

Note: 三階 is commonly read as san-gai in casual speech, and 四階 is yon-kai (not shi-kai, which sounds like “death” floor).

Times Occurrences: 回 (kai)

This counter is for counting occurrences, frequency, and rounds:

一回 (ik-kai), 二回 (ni-kai), 三回 (san-kai), 四回 (yon-kai), 五回 (go-kai), 六回 (rok-kai), 七回 (nana-kai), 八回 (hak-kai), 九回 (kyuu-kai), 十回 (juk-kai)

The consonant changes are identical to the 階 (kai) counter.

Age: 歳 (sai)

This counter is for years of age:

一歳 (is-sai), 二歳 (ni-sai), 三歳 (san-sai), 四歳 (yon-sai), 五歳 (go-sai), 六歳 (roku-sai), 七歳 (nana-sai), 八歳 (has-sai), 九歳 (kyuu-sai), 十歳 (jus-sai)

In casual conversation, さい is often dropped entirely for small children: もう三つ (mou mittsu — already three years old). This uses the tsu counter instead.

Pairs: 足 (soku)

This counter is for pairs of footwear and socks:

一足 (is-soku), 二足 (ni-soku), 三足 (san-zoku), 四足 (yon-soku), 五足 (go-soku), 六足 (roku-soku), 七足 (nana-soku), 八足 (has-soku), 九足 (kyuu-soku), 十足 (jus-soku)

Small Pieces: 個 (ko)

This counter is one of the most generic. It is used for small, compact objects: fruit (especially apples), eggs, balls, batteries, and other small items:

一個 (ik-ko), 二個 (ni-ko), 三個 (san-ko), 四個 (yon-ko), 五個 (go-ko), 六個 (rok-ko), 七個 (nana-ko), 八個 (hak-ko), 九個 (kyuu-ko), 十個 (juk-ko)

Categorization by Object Type

To help you choose the right counter, here is a quick reference table:

People and living things:

人 (nin) — people (except hitori/futari)
匹 (hiki) — small animals
頭 (tou) — large animals
羽 (wa) — birds and rabbits

Objects by shape:

枚 (mai) — flat objects
本 (hon) — long cylindrical objects
冊 (satsu) — bound objects
個 (ko) — small compact objects
台 (dai) — machinery and vehicles

Abstract concepts:

回 (kai) — occurrences
歳 (sai) — age
足 (soku) — pairs
杯 (hai) — cupfuls

The Consonant Change Rules

The most challenging aspect of Japanese counters is the systematic consonant changes that occur when certain numbers precede a counter starting with H, K, S, or T. These changes follow predictable patterns:

Pattern 1: /h/ becomes /p/ or /b/

When 1, 6, 8, and 10 precede an H-initial counter:

一 + 本 (hon) = ip-pon
六 + 匹 (hiki) = rop-piki
八 + 杯 (hai) = hap-pai
十 + 冊 (satsu) = jus-satsu

When 3 precedes an H-initial counter:

三 + 本 (hon) = san-bon
三 + 匹 (hiki) = san-biki
三 + 杯 (hai) = san-bai

Pattern 2: Geminate consonant (small つ)

When 1, 6, 8, and 10 precede K, S, or T-initial counters:

一 + 個 (ko) = ik-ko
六 + 階 (kai) = rok-kai
八 + 歳 (sai) = has-sai
十 + 冊 (satsu) = jus-satsu

The Number 4 and 7 Exceptions

Numbers 4 and 7 always use yon and nana in counters, never shi and shichi:

四本 (yon-hon), not shi-hon
七匹 (nana-hiki), not shichi-hiki

This avoids confusion with homophones and ensures clarity in speech.

Counters with Native Japanese Numbers

Some counters use the native Japanese number system (hitotsu, futatsu, etc.) instead of Sino-Japanese numbers:

Days of the month: 一日 (tsuitachi), 二日 (futsuka), 三日 (mikka), 四日 (yokka), 五日 (itsuka), 六日 (muika), 七日 (nanoka), 八日 (youka), 九日 (kokonoka), 十日 (touka)

Number of days: Same readings as days of the month when counting duration: 三日間 (mikka-kan — three days), 十日間 (touka-kan — ten days)

Counter for people (alternative): The native counting 一人 (hitori) and 二人 (futari) come from the native system.

Counters in Context

Learning counters in isolation is difficult. Here are examples of counters in full sentences:

人:

教室に学生が五人います。(kyoushitsu ni gakusei ga go-nin imasu — There are five students in the classroom.)
家族は四人です。(kazoku wa yo-nin desu — My family has four people.)

枚:

紙を三枚ください。(kami o san-mai kudasai — Please give me three sheets of paper.)
写真を一枚撮りました。(shashin o ichi-mai torimashita — I took one photo.)

本:

ビールを三本買いました。(biiru o san-bon kaimashita — I bought three bottles of beer.)
鉛筆が二本あります。(enpitsu ga ni-hon arimasu — There are two pencils.)

匹:

猫を二匹飼っています。(neko o ni-hiki katte imasu — I have two cats.)
魚が一匹釣れました。(sakana ga ip-piki tsuremashita — I caught one fish.)

台:

車を一台持っています。(kuruma o ichi-dai motte imasu — I have one car.)
コンピュータが三台あります。(konpyuuta ga san-dai arimasu — There are three computers.)

Common Mistakes and How to Avoid Them

Mistake 1: Using the Wrong Counter

The most common mistake is using a generic counter like 個 (ko) for everything. While Japanese speakers will understand you, it sounds unnatural. The solution is to learn the most common counter for each object you frequently discuss.

Mistake 2: Forgetting Consonant Changes

Beginners often say san-hon instead of san-bon, or ichi-hiki instead of ip-piki. These small errors accumulate and mark your speech as non-native. Practice the consonant change patterns until they become automatic.

Mistake 3: Using Shi and Shichi

Using shi for 4 (which means death) and shichi for 7 (easily confused with ichi) in counters is a common trap. Always default to yon and nana when counting.

Mistake 4: Mixing Native and Sino-Japanese Numbers

Some counters require native numbers, others use Sino-Japanese. The tsu counter uses native numbers, but most other counters use Sino-Japanese. Do not mix them — for example, never say hitotsu-mai or futatsu-hiki.

Mistake 5: Overusing the Generic Counter

The つ counter and 個 counter are useful fallbacks, but relying on them exclusively prevents you from learning the specific counters that make Japanese speech precise and natural.

Effective Practice Strategies

Strategy 1: Learn Counters by Category

Group counters by the type of object they describe (flat, long, small, etc.) rather than memorizing them alphabetically. This helps your brain build semantic categories.

Strategy 2: Use Flashcards with Images

Create flashcards where the front shows a picture of an object and the number, and the back shows the correct counter phrase. Visual association is stronger than text-only memorization.

Our N5 flashcards and N4 flashcards include counter practice for common objects.

Strategy 3: Practice with Real Objects

Walk around your room and count everything you see using the correct counter. This physical, contextual practice is highly effective for retention.

Strategy 4: Listen for Counters in Media

Japanese TV shows, news, and anime use counters frequently. Pay attention to how native speakers use them. Cooking shows are particularly good for practicing the 個, 本, and 枚 counters.

Strategy 5: Use Spaced Repetition

Review counters at increasing intervals to move them from short-term to long-term memory. For more on spaced repetition, read our guide on how to use flashcards for kanji, which applies equally to counter study.

Counters by JLPT Level

N5 Counters (Basic)

人 (nin) — people
枚 (mai) — flat objects
本 (hon) — long objects
匹 (hiki) — small animals
個 (ko) — small objects
歳 (sai) — age
つ (tsu) — generic

N4 Counters (Intermediate)

台 (dai) — machines
冊 (satsu) — books
杯 (hai) — cups
回 (kai) — times
足 (soku) — pairs
階 (kai) — floors
頭 (tou) — large animals

N3 and Above (Advanced)

着 (chaku) — clothing
軒 (ken) — houses
基 (ki) — monuments
曲 (kyoku) — songs
行 (gyou) — lines of text
粒 (tsubu) — grains/drops
羽 (wa) — birds
艘 (sou) — boats
通 (tsuu) — letters/documents
片 (hen) — pieces/slices

Final Thoughts

Japanese counters are a challenging but essential part of the language. The good news is that the system follows consistent patterns. Once you master the consonant change rules and the two-dozen most common counters, you will be able to handle the vast majority of counting situations you encounter.

Start with the tsu counter for everyday situations, add the most common counters for the objects in your daily life, and gradually expand your repertoire. With consistent practice, counter usage will shift from a conscious effort to an automatic part of your Japanese.

For grammar practice that reinforces counter usage, visit our essential Japanese grammar guide. You can also practice counters in context using the N5 study pages and N5 vocabulary pages. For a complete list of vocabulary organized by level, see our Japanese vocabulary guide.

The JLPT tests counters in both the grammar and listening sections. Familiarity with common counters will improve your score in both areas. Combine your counter study with our JLPT N5 study guide and JLPT N4 study guide for comprehensive JLPT preparation.

Practice Your Skills

Ready to apply what you learned? KanjiTest.Online has everything you need:

Study — Browse all N5 kanji with readings and examples
Flashcards — Flip through interactive flashcards
Vocabulary — Learn essential N5 words
Practice Tests — Test your knowledge with timed quizzes

Don’t stop here — check out our guides on how to pass JLPT N5, essential Japanese grammar, and Japanese vocabulary for more.