Kanji
Kanji (漢字) are the logographic characters adopted from Chinese that form one of the three writing systems of Japanese, along with hiragana and katakana. Each kanji represents a word or a meaningful part of a word, and they are used for nouns, verb stems, adjective stems, and many adverbs.
Origins and History
Kanji (漢字) originated in China and were introduced to Japan through contact with the Chinese writing system, likely by the 5th century CE. Early Japanese had no native writing system, so they initially used kanji for their phonetic value to represent Japanese sounds, a system known as man'yōgana (万葉仮名). Over time, simplified forms of man'yōgana evolved into the phonetic syllabaries hiragana (ひらがな) and katakana (カタカナ), while kanji continued to be used for meaning.
How Many Kanji Are There?
Dictionaries list over 50,000 kanji, but the vast majority are obscure or obsolete. The Japanese government designates 2,136 characters as the Jōyō Kanji (常用漢字), meaning "regular-use kanji," which are taught in compulsory education and considered sufficient for everyday reading and writing. In practice, most written material uses a subset of about 1,000 to 2,000 kanji, with the Jōyō list covering the essentials. For the JLPT (Japanese-Language Proficiency Test), the highest level (N1) assumes knowledge of roughly 2,000 kanji, but many learners find that mastering the Jōyō list is enough for most purposes.
On and Kun Readings
One of the most distinctive features of kanji is that a single character can have multiple pronunciations, called readings. These fall into two main categories:
- On'yomi (音読み) — the Chinese-derived reading, based on the pronunciation the character had in Chinese when it was borrowed. For example, the kanji 水 (water) has the on'yomi sui (as in 水曜日, suiyōbi, Wednesday).
- Kun'yomi (訓読み) — the native Japanese reading, which assigns a Japanese word to the character. For 水, the kun'yomi is mizu (as in 水, mizu, water).
Some kanji have multiple on'yomi or kun'yomi, and some have readings that are used only in certain compounds or names. For instance, 生 (life, birth) has over a dozen readings, including sei, shō, ikiru, umu, nama, and ki. This complexity arises because kanji were borrowed from different Chinese dialects and time periods, and because Japanese speakers attached their own existing words to the characters.
Why One Character Has Several Pronunciations
The reason a single kanji can have multiple pronunciations lies in the history of its adoption. When kanji were first introduced, they were used for both their meaning and their sound. Over centuries, multiple Chinese pronunciations were imported from different regions and eras, leading to multiple on'yomi. At the same time, Japanese speakers already had native words for many concepts, so they assigned these words as kun'yomi. Thus, a kanji like 山 (mountain) has the on'yomi san (as in 富士山, Fujisan) and the kun'yomi yama (as in 山, yama).
In addition, some readings are used only in specific contexts, such as in personal names (nanori, 名乗り) or in particular compounds. This is why learners must memorize readings in context rather than as fixed rules.
Practical Usage
In modern Japanese, kanji are used for content words, while hiragana is used for grammatical particles and verb endings, and katakana for foreign loanwords and emphasis. For example, the sentence "I drink water" is written 水を飲みます (mizu o nomimasu), where 水 (water) is kanji, を is a particle, and 飲みます (drink) combines a kanji stem with a hiragana ending.
Learning kanji is often a major challenge for learners, but it is not insurmountable. Many resources, including kanji lists and stroke order games, can help. The key is to study kanji in context, focusing on common words and compounds rather than isolated characters.
Common Misconception
A common misconception is that you need to know thousands of kanji to read Japanese. In reality, knowing the 2,136 Jōyō kanji is sufficient for almost all everyday reading, and even knowing 1,000 can get you through a surprising amount of material.
A common misconception is that you need to know thousands of kanji to read Japanese, but in reality, the 2,136 Jōyō kanji are sufficient for almost all everyday reading.
Questions
How many kanji do I need to know to read a newspaper?
The Jōyō kanji list of 2,136 characters covers the vast majority of kanji used in newspapers and general publications. In practice, knowing about 1,000 to 2,000 kanji will allow you to read most everyday texts, with occasional look-ups.
What is the difference between on and kun readings?
On'yomi are the Chinese-derived pronunciations, often used in compound words. Kun'yomi are native Japanese readings, used when the kanji stands alone or with okurigana (hiragana endings). For example, 水 is read *sui* (on) in 水曜日, but *mizu* (kun) when alone.
Why does the same kanji have different pronunciations?
Because kanji were borrowed from Chinese at different times and from different regions, and because Japanese speakers attached their own native words to them. This resulted in multiple readings for many characters, which are used in different contexts.