In English, you just say “three cats.” In Japanese, you need a special word between the number and the noun: 三匹の猫 (san-biki no neko). That special word is a counter (助数詞, josuushi), and it changes depending on what you’re counting. Welcome to one of Japanese’s most notorious quirks.
The Good News
Japanese technically has 500+ counters, but you only need about 15-20 for daily life. Native speakers often use the generic counter つ (tsu) when they forget the specific one. So relax - this is learnable.
The 15 Essential Counters
| Counter | Used For | Example |
|---|---|---|
| つ | Generic (anything) | 一つ (hitotsu) - one thing |
| 個 (こ) | Small objects | 三個 (sanko) - 3 apples |
| 人 (にん) | People | 二人 (futari) - 2 people |
| 本 (ほん) | Long/cylindrical objects | 一本 (ippon) - 1 bottle/pen |
| 枚 (まい) | Flat objects | 三枚 (sanmai) - 3 sheets/tickets |
| 匹 (ひき) | Small animals | 二匹 (nihiki) - 2 cats/dogs |
| 頭 (とう) | Large animals | 一頭 (ittou) - 1 horse/cow |
| 羽 (わ) | Birds, rabbits | 三羽 (sanwa) - 3 birds |
| 台 (だい) | Machines, vehicles | 一台 (ichidai) - 1 car |
| 冊 (さつ) | Books, notebooks | 二冊 (nisatsu) - 2 books |
| 杯 (はい) | Cups, glasses | 一杯 (ippai) - 1 cup |
| 回 (かい) | Times (frequency) | 三回 (sankai) - 3 times |
| 階 (かい) | Floors (building) | 二階 (nikai) - 2nd floor |
| 時 (じ) | O’clock | 三時 (sanji) - 3 o’clock |
| 分 (ふん) | Minutes | 五分 (gofun) - 5 minutes |
The Tricky Part: Sound Changes
Numbers change pronunciation when combined with certain counters. This is called rendaku (連濁) or euphonic changes:
本 (hon): 一本 (ippon), 二本 (nihon), 三本 (sanbon), 四本 (yonhon), 六本 (roppon), 八本 (happon), 十本 (juppon)
匹 (hiki): 一匹 (ippiki), 三匹 (sanbiki), 六匹 (roppiki), 八匹 (happiki), 十匹 (juppiki)
Pattern: numbers 1, 6, 8, 10 often cause sound changes. Don’t memorize rules - learn through repeated exposure with audio.
The Generic Counter: つ (tsu)
When in doubt, use the native Japanese counting system with つ. It works for almost anything and native speakers use it constantly:
- 一つ (hitotsu) - 1
- 二つ (futatsu) - 2
- 三つ (mittsu) - 3
- 四つ (yottsu) - 4
- 五つ (itsutsu) - 5
- 六つ (muttsu) - 6
- 七つ (nanatsu) - 7
- 八つ (yattsu) - 8
- 九つ (kokonotsu) - 9
- 十 (tou) - 10
Limitation: Only works for 1-10. Above 10, you need specific counters.
Fun Counter Facts
- Rabbits use the bird counter (羽) - because their ears look like wings (historical reason)
- Sushi uses 貫 (kan) - a unique counter just for sushi pieces
- Squid and crab use 杯 (hai) - the cup counter, because their bodies are bowl-shaped
How Kanjijo Helps with Counters
Counters are vocabulary - and the best way to learn vocabulary is through SRS flashcards with context:
- Counter kanji (個, 本, 枚, etc.) are part of Kanjijo’s vocabulary curriculum
- Native audio lets you hear the correct sound changes
- SRS reviews ensure you don’t forget counters after learning them
- Encounter counters in real context through OCR scanning of signs and menus
Kanjijo’s native pronunciation makes counter sound changes easy to absorb.