Two Number Systems
One of the first surprises for learners of Japanese is that the language has not one but two sets of numbers. The Sino-Japanese system (kango / 漢語) was borrowed from Chinese and is by far the most commonly used in daily life. The native Japanese system (wago / 和語) is older and appears in specific contexts, particularly when counting objects without a counter word and in certain traditional expressions.
Understanding both systems and knowing when to use each is essential for sounding natural in Japanese.
Focus on the Sino-Japanese (kango) system first — it covers the vast majority of situations including telling time, giving phone numbers, counting money, and stating ages. You will use it far more often than the wago system.
Sino-Japanese Numbers (Kango): 1-10
The kango system is the backbone of Japanese counting. These are the numbers you will use most often.
いち、に、さん、よん、ご
ichi, ni, san, yon, go
One, two, three, four, five.
ろく、なな、はち、きゅう、じゅう
roku, nana, hachi, kyuu, juu
Six, seven, eight, nine, ten.
Notice that the numbers 4, 7, and 9 each have two possible readings. This is not just trivia — the choice of reading matters and changes depending on what you are counting.
The number 4 can be read as し (shi) or よん (yon), and 7 can be しち (shichi) or なな (nana). In most everyday counting, prefer よん and なな because し and しち are easy to confuse with each other. The number 9 can be く (ku) or きゅう (kyuu) — prefer きゅう in most cases.
Larger Numbers
Building larger numbers in the kango system follows a logical pattern, but the grouping differs from English. Japanese groups numbers by ten-thousands (万 / man) rather than thousands.
ひゃくにじゅうさん
hyaku ni juu san
123 (one hundred, two tens, three).
いちまん ごせん ろっぴゃく
ichiman gosen roppyaku
15,600 (one ten-thousand, five thousand, six hundred).
The key units are:
- じゅう (juu) — 10
- ひゃく (hyaku) — 100
- せん (sen) — 1,000
- まん (man) — 10,000
Japanese has a dedicated unit for 10,000 (まん / man) with no direct English equivalent. The number 100,000 is expressed as じゅうまん (ten ten-thousands), not as a single word. This grouping-by-four-digits system takes some getting used to but becomes natural with practice.
Native Japanese Numbers (Wago): 1-10
The wago numbers are used when counting objects generally (without a specific counter word) and in some fixed expressions. They only go up to 10.
ひとつ、ふたつ、みっつ、よっつ、いつつ
hitotsu, futatsu, mittsu, yottsu, itsutsu
One, two, three, four, five (things).
むっつ、ななつ、やっつ、ここのつ、とお
muttsu, nanatsu, yattsu, kokonotsu, too
Six, seven, eight, nine, ten (things).
These wago numbers are extremely useful when you do not know the right counter for something, or when ordering food and general items.
The native Japanese number system reflects the language before Chinese influence arrived. While the kango system dominates modern usage, wago numbers survive in everyday situations like ordering at restaurants ("ふたつください" — "two, please"), children's counting games, and traditional contexts like Shinto rituals.
Essential Counter Words
Japanese requires counter words (also called classifiers) when counting specific types of objects. You cannot just say "three books" with a bare number — you need the right counter.
People: 人 (nin)
Counting people is one of the most important counters, and it has highly irregular readings for 1 and 2.
ひとり で 来ました。
hitori de kimashita.
I came alone (one person).
ふたり の 子供がいます。
futari no kodomo ga imasu.
I have two children (two people).
The counter for people (人) uses wago readings for 1 and 2: ひとり (hitori) and ふたり (futari). From 3 onward, it switches to kango: さんにん (sannin), よにん (yonin), ごにん (gonin). This is one of the most common mistakes for beginners — do not say "いちにん" for one person.
Long, Thin Objects: 本 (hon)
This counter is used for bottles, pens, umbrellas, trees, roads, and anything elongated.
ペンを にほん ください。
pen wo nihon kudasai.
Two pens, please.
ビールを さんぼん 飲みました。
biiru wo sanbon nomimashita.
I drank three bottles of beer.
The counter 本 is notorious for its sound changes: いっぽん (1), にほん (2), さんぼん (3), よんほん (4), ごほん (5), ろっぽん (6), ななほん (7), はっぽん (8), きゅうほん (9), じゅっぽん (10).
Flat Objects: 枚 (mai)
Used for paper, shirts, plates, tickets, and other flat things.
切符を にまい 買いました。
kippu wo nimai kaimashita.
I bought two tickets.
Small Animals: 匹 (hiki)
Used for cats, dogs, fish, insects, and other small-to-medium animals. Large animals like horses and elephants use 頭 (tou) instead.
猫を さんびき 飼っています。
neko wo sanbiki katte imasu.
I have three cats.
Small Objects: 個 (ko)
A general counter for small, compact things like apples, eggs, balls, and boxes.
りんごを よんこ ください。
ringo wo yonko kudasai.
Four apples, please.
Machines and Vehicles: 台 (dai)
Used for cars, computers, televisions, bicycles, and other machines.
車を にだい 持っています。
kuruma wo nidai motte imasu.
I have two cars.
Quick Reference Table
| Number | Kango | Wago | People (人) | Long Things (本) |
|---|---|---|---|---|
| 1 | いち (ichi) | ひとつ (hitotsu) | ひとり (hitori) | いっぽん (ippon) |
| 2 | に (ni) | ふたつ (futatsu) | ふたり (futari) | にほん (nihon) |
| 3 | さん (san) | みっつ (mittsu) | さんにん (sannin) | さんぼん (sanbon) |
| 4 | よん (yon) | よっつ (yottsu) | よにん (yonin) | よんほん (yonhon) |
| 5 | ご (go) | いつつ (itsutsu) | ごにん (gonin) | ごほん (gohon) |
| 6 | ろく (roku) | むっつ (muttsu) | ろくにん (rokunin) | ろっぽん (roppon) |
| 7 | なな (nana) | ななつ (nanatsu) | ななにん (nananin) | ななほん (nanahon) |
| 8 | はち (hachi) | やっつ (yattsu) | はちにん (hachinin) | はっぽん (happon) |
| 9 | きゅう (kyuu) | ここのつ (kokonotsu) | きゅうにん (kyuunin) | きゅうほん (kyuuhon) |
| 10 | じゅう (juu) | とお (too) | じゅうにん (juunin) | じゅっぽん (juppon) |
Summary
Japanese numbers require learning two systems and a collection of counter words, but the patterns become intuitive with practice. The key takeaways:
- Learn kango numbers first — they are used in the majority of situations including time, money, ages, and phone numbers
- Know wago numbers 1-10 — they are your fallback when you do not know the right counter, especially useful when ordering food
- Master the people counter early — ひとり and ふたり are irregular and used constantly in daily conversation
- Watch for sound changes — counters like 本 change pronunciation depending on the number (いっぽん、にほん、さんぼん)
- Avoid し for 4 and しち for 7 — prefer よん and なな in everyday counting to avoid confusion and cultural sensitivity around the number 4