Mastering Japanese Numbers: A Comprehensive Guide to Japanese Numeral Systems

みなさん、こんにちは！

げんきにしていますでしょうか？

So, Today we are going to master the Japanese Number System.

Just like us, people in Japan write numbers like 1, 2, 3, 4, 100, 10000, 999999 etc. The difference is in how they say those numbers, and trust me, it sounds completely different! It might seem tricky at first, but it’s not rocket science.

There are specific rules in the Japanese counting system that make it easier to count anything once you get the hang of it. 

So, whether you’re planning a trip to Japan, learning the language, or just curious, we’re going to break it down together and make counting in Japanese simple and fun!

In this comprehensive guide, We’ll start with the basics of Japanese numerals, like counting from 1 to 10, and then move on to bigger numbers. 

By the end, you’ll be able to read and say Japanese numbers with confidence. 

Ready to dive in? 

Let’s get started and master these Japanese numbers together!

じゃ、はじめましょう。

Introduction To Japanese Number System

In Japanese, numbers can be written in several different ways, depending on the context. The three main writing systems we can see in Japan are Kanji, Hiragana, and the standard Arabic numerals (like 1, 2, 3). 

Each system has its own unique usage and significance. 

Let’s break it down.

#1. Kanji (漢字)

Kanji numerals are traditional Chinese characters that represent numbers. For example, the number one is written as 一 (ichi), two as 二 (ni), and three as 三 (san). Kanji is commonly used in formal writing, dates, money, and when expressing large numbers. 

Learning kanji numerals is essential for reading Japanese text in books, newspapers, and official documents.

#2. Hiragana (ひらがな)

Although not as common for numbers, hiragana can be used to write out numbers phonetically, especially for younger children or when trying to emphasize the sound of the number. 

For example, one is written as いち (ichi), two as に (ni), and three as さん (san). This method is less formal and is often seen in educational materials or simplified texts.

#3. Arabic Numerals (1, 2, 3)

Just like in English, Arabic numerals are widely used in Japan for convenience. You’ll see them on clocks, in phone numbers, prices, and when writing numbers in a casual context. 

They are the most straightforward and universally recognized way to write numbers, making them especially useful in everyday life.

Basic Numbers (1-10) in Japanese

Learning to count from 1 to 10 in Japanese is the first step in understanding the language’s number system. 

These numbers are used all the time—from telling time to counting objects. Once you know these basic numbers, you can move on to larger numbers too.

So, let’s learn from the chart below showing the numbers 0 to 10 in Japanese, written in kanji, hiragana, Arabic numerals, and with the Japanese pronunciation:

Special Notes on Zero(ゼロ, れい、まる), Four(よん、し), Seven(なな、しち)

• Zero(ゼロ, れい、まる): As shown in the chart above, the number zero in Japanese has three common pronunciations: ゼロ (Zero), れい (Rei), and まる (Maru). ゼロ (Zero) is borrowed from English and is often used in modern contexts. 

れい (Rei) is the traditional kanji pronunciation, frequently used in formal settings.

Lastly, まる (Maru), meaning “circle,” is casually used in situations like sports scores or phone numbers etc.

• Four (4) – 四 (し/よん): The number four in Japanese has two common pronunciations: “shi” (し) and “yon” (よん).
  
  The pronunciation “shi” is often avoided because it sounds like the word for death (死). As a result, “yon” is generally preferred in most contexts.
  
  However, “shi” is still used in certain cases, such as when counting months—for example, April is pronounced as “shi-gatsu” (四月). 

• Seven (7) – 七 (しち/なな): Just like “shi” for four, “shichi” (しち) for seven is also used in certain contexts, such as counting months—for example, July is “shichi-gatsu” (七月). However, “nana” (なな) is more commonly used in everyday situations.

Building on the Basics: Numbers From 11 To 19

Now that you’ve got the foundation of the Japanese number system, you can easily form numbers beyond 10. By using the basic numbers, you can create any number from 11 to 19, then move on to the tens, hundreds, and even thousands. Here’s how it all comes together.

Now that you’ve got the foundation of the Japanese number system, you can easily form numbers beyond 10. By using the basic numbers, you can create any number from 11 to 19, then move on to the tens, hundreds, and even thousands. 

Let’s start with the numbers 11 through 19, which are simply the number 10 (十, juu) combined with the numbers 1 through 9. For example, 11 is 十一 (juu-ichi) which is simply (10 + 1), 12 is 十二 (juu-ni) which is (12+2), and so on.

Below is a chart that shows how these numbers are formed:

So, to form the numbers from 11 to 19, you just need to add the corresponding single-digit number to ten (十, juu). For example, adding one (一, ichi) to ten gives you eleven (十一, juu-ichi), and adding two (二, ni) to ten gives you twelve (十二, juu-ni). It’s a simple and logical pattern that makes learning these numbers straightforward.

Building Numbers From 20 and Beyond

Once you know the numbers from 1 to 19, learning the tens like 20, 30, and 40 is easy. The method is simple: you use multiples of 10 as your Base.

For example:

20 is 二十 (ni-juu), which means “two tens.”

30 is 三十 (san-juu), which means “three tens.”

40 is 四十 (yon-juu), which means “four tens.”

To make numbers like 21 or 32, just add the extra numbers to these bases:

21 is 二十一 (ni-juu-ichi), which means “20 plus 1.”

32 is 三十二 (san-juu-ni), which means “30 plus 2.”

 This pattern makes it easy to count up to 99. 

Below is a detailed chart to help you see how each number is constructed.

So, to make any number from 20 to 99, you just follow a simple pattern: [number of tens] + 十 (juu) + [number of ones]. For example、 45 is 四十五 [よんじゅうご] (yon-juu-go)、 which means 4 x 10 + 5. This way, you can easily count all the way up to 99.

Now, let’s move on to learning how to count in the hundreds, thousands, and beyond!

Understanding Hundreds and Above

Now that you’ve got the basics down, let’s explore how to count up to 999 in Japanese. Just like with tens, forming hundreds is a matter of multiplying the base numbers (1–9) by 100. 

But you should know what “hundred” is called in Japanese—it’s 百 (ひゃく, hyaku).

So, what about 101?

I bet you’ve already figured it out. 

Yep, it’s 百一 (ひゃくいち, hyaku-ichi). 

We used the same formula we learned before: simply add the smaller numbers after “hyaku.” 

Easy, right?

So, what do you think 200 is?

It’s 二百 (にひゃく, ni-hyaku), which is simply 2 x 100. Just like before, you use the number 2 and then add “hyaku” to indicate the hundreds place.

Let’s expand this with a complete chart from 100 up to 900:

So, the above chart gives you an idea of how to form numbers in the hundreds. 

But Have you noticed in the chart that the pronunciation for 300, 600, and 800 is a bit different from what you might expect? 

For example, 

300 is pronounced さんびゃく (san-byaku) instead of “さんひゃく、san-hyaku”.

600 is ろっぴゃく (roppyaku) instead of “ろくひゃく、roku-hyaku”.

and 800 is はっぴゃく (happyaku) instead of “はちひゃく、hachi-hyaku”. 

Why such a difference? 

The reason for these differences is that Japanese often changes the pronunciation slightly for smoother and faster speech. This helps make the numbers easier to say.

So, now let’s create some random number to better understand how it works.

Understanding Thousands and Above

Now that you’re comfortable with counting in the hundreds, it’s time to level up and explore how to count in the thousands. The principle is the same: you multiply the base numbers (1–9) by 1,000.

In Japanese、 the word for “thousand” is 千 (せん, sen). So, just as 百 (ひゃく, hyaku) is used for 100, 千 (せん, sen) is used for 1,000.

Let’s dive into what 1,000 looks like.

What about 1,001?

Just like with the hundreds, you can guess how to say it. 

It’s 千一 (せんいち, sen-ichi), which combines 1,000 (sen) and 1 (ichi). 

It’s that simple.

And 2,000?

That’s 二千 (にせん, ni-sen), which is simply 2 x 1,000.

To give you a clearer idea, here’s a complete chart from 1,000 up to 9,000:

Just like with the hundreds, where some numbers had slight pronunciation changes, you’ll find that 3,000 and 8,000 are a little different from what you might expect.

So, here you have to remember, 3,000 Pronounced さんぜん (san-zen) instead of saying “さんせん” (san-sen) and 8000 Pronounced はっせん (hassen), Instead of saying “はちせん” (hachi-sen.

So How Do You Say 3,333 in Japanese?

If you’ve been following along, you might be able to guess how to say it.

It’s 三千三百三十三 (さんぜんさんびゃくさんじゅうさん, san-zen san-byaku san-juu san). This is 3 x 1,000 + 3 x 100 + 3 x 10 + 3.

And what about 8848 in Japanese?

Here’s a fun one: the height of the world’s tallest mountain, Mount Everest in Nepal, is 8,848 meters.

In Japanese, you would say it as 八千八百四十八 (はっせんはっぴゃくよんじゅうはち, hassen happyaku yon-juu hachi). This is 8 x 1,000 + 8 x 100 + 4 x 10 + 8.

Let’s View More Examples of How Thousand Numbers Are Formed

This way, you can easily count up to 9,999 in Japanese. Whether it’s 1,234 or 9,876, you can apply the same principles you’ve learned to form these numbers. The same pattern continues until you reach 9,999.

From here, the next step would be learning how to count beyond 10,000, where the pattern changes slightly. 

So Let’s dive in.

Expanding to 10,000 and Beyond

Now that you’ve conquered counting up to 9,999, it’s time to step into the world of five-digit numbers. 

In Japanese, there’s a fascinating twist: instead of grouping by thousands as we do in English, numbers are grouped by ten-thousands. This is a unique feature of the Japanese numbering system that reflects a different way of conceptualizing large numbers.

While in English, we naturally think of 10,000 as “ten thousand,” in Japanese, it’s treated as a single unit called 万 (まん, man). 

This grouping method requires a slight shift in thinking but is quite logical once you get the hang of it. 

So, 10,000 is 万 (まん, man) right? 

Well… Nooooooo, not exactly! Here’s a small twist.

Just like how we used “百” (ひゃく, hyaku) for hundreds and “千” (せん, sen) for thousands, you might think you’d just say “万” (まん, man) for 10,000. But in Japanese, we actually need to add “一” (いち, ichi) before “万” (まん, man) to make it clear we’re talking about one set of 10,000. Means it’s 一万 (いちまん) “one ten-thousand.” (1 x 10,000). 

And just like before, when you move on to bigger numbers like 20,000, 30,000, and beyond, you simply add the appropriate number before “万” (まん, man). For example, 20,000 is “二万” (にまん, ni-man) and 30,000 is “三万” (さんまん, san-man).

Now, if you’re expecting things to change after “十万” (じゅうまん, juu-man or 100,000), you’re in for a surprise. 

Here it keeps going in the same way up to 9999 x 万 which is  “九千九百九十九万” (きゅうせんきゅうひゃくきゅうじゅうきゅうまん, kyuu-sen-kyuu-hyaku-kyuu-juu-kyuu-man or 99990000).

Confused? 

Let’s practice converting some large numbers in the Japanese counting system.

Let’s take the number 25,300 as an example.

So, as we discussed above, it’s expressed as 二万五千三百 (にまんごせんさんびゃく, ni-man go-sen san-byaku). 

Here’s how it breaks down: 

“二万” (にまん, ni-man) represents 20,000.

 “五千” (ごせん, go-sen) stands for 5,000.

and “三百” (さんびゃく, san-byaku) covers 300. 

So when you put it all together (20000 + 5000 + 300) , you get  25,300.

Now, Let’s take a look at an even more complex number, such as 3,472,589. 

In Japanese, this would be written as 三百四十七万二千五百八十九 (さんびゃくよんじゅうななまんにせんごひゃくはちじゅうきゅう, san-byaku yon-juu nana-man ni-sen go-hyaku hachi-juu kyuu). 

Here’s how it all comes together:

“三百四十七万” (さんびゃくよんじゅうななまん, san-byaku yon-juu nana-man) represents 3,470,000.

“二千” (にせん, ni-sen) adds 2,000.

“五百” (ごひゃく, go-hyaku) adds 500.

“八十九” (はちじゅうきゅう, hachi-juu kyuu) adds the remaining 89.

When you combine these elements, you get 3,472,589.

That way, we can count up to 99,999,999. Which is 九千九百九十九万九千九百九十九, (きゅう せん きゅう ひゃく きゅう じゅう きゅう まん きゅう せん きゅう ひゃく きゅう じゅう きゅう)

But what about numbers even larger than that?

Ho To Count Numbers Over 100,000,000 in Japanese

When we move beyond 99,999,999, we step into the category of 億 (おく, oku), which is equivalent to 100 million. Just like 万 (まん, man) is the unit for ten thousand, 億 (おく, oku) is the unit for one hundred million. 

So, 100,000,000 (100 Millions) becomes  一億 (いちおく, ichi – oku)

This way, we can write 200,000,000 (200 Millions) as  一億 (におく, ni – oku).

Let’s take another example.

If you want to express the number 1,234,567,890 (1.23 billion). In Japanese, you would say it as:

十二億三千四百五十六万七千八百九十 (じゅうにおく さんぜん よんひゃく ごじゅう ろくまん ななせん はっぴゃく きゅうじゅう, juu-ni oku san-zen yon-hyaku go-juu roku-man nana-sen happyaku kyuu-juu).

Breaking it down:

“十二億” (じゅうにおく, juu-ni oku) represents 1,200,000,000 (1.2 billion).

“三千四百五十六万” (さんぜんよんひゃくごじゅうろくまん, san-zen yon-hyaku go-juu roku-man) adds 34,560,000.

“七千八百九十” (ななせんはっぴゃくきゅうじゅう, nana-sen happyaku kyuu-juu) adds the remaining 7,890.

This system allows us to go up to 九千九百九十九億 (きゅうせんきゅうひゃくきゅうじゅうきゅうおく, kyuu-sen kyuu-hyaku kyuu-juu kyuu oku.

So, the maximum number we can count in this system is 999,999,999,999, which is 九千九百九十九億九千九百九十九万九千九百九十九 (きゅうせんきゅうひゃくきゅうじゅうきゅうおく きゅうせんきゅうひゃくきゅうじゅうきゅうまん きゅうせんきゅうひゃくきゅうじゅうきゅう. 

Now, you might be wondering: is there a way in Japanese to count numbers even bigger than that, like trillions in English?

Counting Beyond a Billion: Trillions in Japanese

In English, after billions, we move into trillions, and Japanese has a similar progression. Once you surpass the 999,999,999,999 mark, the next milestone is 1 trillion. In Japanese, 1 trillion is represented as 兆 (ちょう, chou). 

To make things clearer, let’s look at an example:

1,000,000,000,000 (1 trillion) in Japanese is written as 一兆 (いっちょう, icchou).

Similarly, 2 trillion would be written as 二兆 (にちょう, nichou), and 10 trillion as 十兆 (じゅうちょう, juu-chou).

Let’s have a look at an example for better understanding. 

Here I’m taking the Number: 1,234,567,890,123 (1.234 trillion) 

It would be expressed in japanese numerals system as:

一兆二千三百四十五億六千七百八十九万百二十三

(いっちょうにせんさんびゃくよんじゅうごおくろくせんななひゃくはちじゅうきゅうまんひゃくにじゅうさん, icchou ni-sen san-byaku yon-juu go oku roku-sen nana-hyaku hachi-juu kyuu man hyaku ni-juu san).

Let’s Break it down:

“一兆” (いっちょう, icchou) represents 1,000,000,000,000 (1 trillion).

“二千三百四十五億” (にせんさんびゃくよんじゅうごおく, ni-sen san-byaku yon-juu go oku) adds 234,500,000,000.

“六千七百八十九万” (ろくせんななひゃくはちじゅうきゅうまん, roku-sen nana-hyaku hachi-juu kyuu man) adds 67,890,000.

“百二十三” (ひゃくにじゅうさん, hyaku ni-juu san ) adds the remaining 123.

This pattern can be extended to even larger numbers, allowing you to count up to 9,999兆 (きゅうせんきゅうひゃくきゅうじゅうきゅうちょう.

After “兆” (ちょう, chou), the Japanese numbering system continues into even larger units like “京” (けい, kei), which represents  10^16 or 10 quadrillion. 

For everyday use, you rarely need to go beyond “兆.” 

Most practical situations, whether in personal finance, business, or general conversation, involve numbers far smaller than this.

However, you might encounter these larger units in specific fields like astronomy, national budgets, or scientific data, where incredibly large numbers are common. In such cases, understanding terms like “京” (けい, kei) can be essential.

But for most purposes, including anything from counting money to measuring distances or quantities, staying within the 万 (まん, man), 億 (おく, oku), and 兆 (ちょう, chou) will cover almost everything you need. 

Large Number System: English to Japanese Translation

Let’s have a look at the chart below representing numbers in the English number system, with their corresponding Japanese Kanji, Hiragana, and Romaji.

How About the Decimal Point “.” in the Japanese Number System?

In the Japanese numbering system, handling decimal points is quite straightforward, though it differs slightly from English conventions. The decimal point in Japanese is referred to as “点” (てん, ten), which is directly translated as “dot” or “point.”

For example, the number 123.45 in English would be written in Japanese as 123.45, but pronounced as “ひゃくにじゅうさんてん よん ご” (hyaku ni-juu-san ten yon-go). 

So here we conclude our journey through the Japanese number system. Whether you’re shopping or discussing large quantities, numbers are everywhere. The more you practice, the more natural it will become to think and speak in Japanese numbers.

So, don’t hesitate to incorporate these numbers into your daily routine. Challenge yourself to count in Japanese whenever possible—whether you’re totaling up your grocery bill, measuring ingredients while cooking, or even just keeping track of your steps. The more you use Japanese numbers in practical settings, the more comfortable you’ll become.

To further aid your learning, check out our Arabic to Japanese Number Converter. This handy tool allows you to convert Arabic numbers into Japanese Kanji, Hiragana, and Romaji, making it easier to practice and reinforce your skills. Happy Counting!