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Grammar detail: Japanese numbers and counting

Japanese numbers and counting
283 words
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To get started with numbers and counting in Japanese, see the following article, which includes:
  • Zero to ten
  • Eleven to nineteen
  • Twenty to ninety-nine
  • Hundreds
  • One thousand and ten thousand

Counting above ten thousand

Unlike the Western system, which counts in multiples of a thousand, Japanese counts in multiples of 10,000, so numbers larger than 10,000 take a bit of thought to 'convert' from the Western system to Japanese.
10,000 = 10^4万まん12000 ➜ 10000 + 2x1000 ➜ 一万二千 (いちまんにせん)
10,000 x 10,000 = 100,000,000 = 10^8億おく105 million ➜ 1 x 100 million + 500 x 10,000 ➜ 一億五百万 (いちおくごひゃくまん)
10,000 x 10,000 x 10,000 = 1000,000,000,000 = 10^12兆ちょう1 trillion ➜ 1 million x 1 million ➜ 一兆 (いっちょう)

Counting objects and things

Japanese uses a system of 'counters' - terms which are placed after the number and which partially describe the object being counted. This is not dissimilar to English ('five sheets of paper'), but more regular. However, there are many counters. The following article provides an introduction to the basic counters:
This article provides a slightly more advanced overview of the 40 or so most common counters:

Generic counting

When you don't know the counter to use for an object, or a counter is not suitable, the standard numbers can be turned into counters by using the following
くんよ
訓読
み:
1一つひとつ
2二つふたつ
3三つみっつ
4四つよっつ
5五ついつつ
6六つむっつ
7七つななつ
8八つやっつ
9九つここのつ

Numerical order

The order of objects can be expressed using the form:
number + counter + 目 (め)
For example:
  • 三つ目 (みっつめ) third (generic object)
  • 九人目 (きゅうにんめ) ninth person
  • 二回目 (にかいめ) second time
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Kanji used in this grammar

万
マン   バン    10,000   
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一
イチ   イツ   ひとつ    ひと- one   
二
ニ   ふたつ    ふた two   
千
セン   1000; thousand   ち 1000   
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億
オク    hundred million   
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五
ゴ   いつ-    いつつ five   
百
ヒャク    hundred; 100   
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兆
チョウ   きざし sign, indication   きざす to show signs (of)   
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訓
クン    teaching, precept; Japanese reading of a kanji   
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読
ドク   トク   トウ   よむ to read   
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三
サン   み    みっつ three   
四
シ   four   よ    よつ    よっつ    よん    
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六
ロク   むっつ six   むつ    むい    む    
七
シチ   ななつ    なな    なの seven   
八
ハチ   や    やつ    よう eight   
九
ク   キュウ   ここのつ nine   
目
ボク   モク   eye   ま-    め    
人
ジン   ニン   ひと person   
回
カイ   エ   まわる to revolve   まわす to make turn   
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