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What is kanji? A beginner's guide to Japanese characters

Japanese is written with three scripts at once, and kanji is the one that scares newcomers. It needn't. Here's what kanji actually are, how they fit alongside hiragana and katakana, the two-readings idea that confuses everyone, your first dozen characters, and roughly how many you really need to read.

Three scripts, one sentence

Written Japanese mixes hiragana, katakana and kanji in the same line — often in the same sentence. The two kana are phonetic: each of their ~46 symbols is simply a sound, like letters. Kanji are logographic: each character stands for a meaning, and carries one or more sounds with it. That single difference is the whole story.

The three scripts at a glance

Script	Example	Roughly how many	Each symbol is…
Hiragana	あ	46 basic	a sound (native words, grammar)
Katakana	ア	46 basic	a sound (loanwords, names)
Kanji	山	2,000+ in daily use	a meaning + sound(s)

So in a real sentence the kanji carry the core meanings (nouns, verb stems), and hiragana glues them together with grammar — particles, verb endings, and anything without a common kanji. Katakana steps in for foreign words. You learn the kana first because they're small and finite; kanji you pick up gradually, for years, and that's normal.

What a single kanji is

Take 山. It means mountain. Look at it for a second and you can almost see three peaks. It came from China over a thousand years ago, along with thousands of others, and Japanese kept the picture-of-meaning idea while attaching its own sounds. So a kanji is not a letter and not a word exactly — it's a unit of meaning that can be a whole word on its own or a building block inside a longer one.

The two readings: on'yomi and kun'yomi

Here's the part that trips up every beginner. Most kanji have two kinds of reading, and which one you use depends on context.

• On'yomi (音読み) — the Chinese-derived sound. Used mostly when kanji combine into compound words.
• Kun'yomi (訓読み) — the native Japanese sound. Used mostly when the kanji stands alone as a word.

The classic example: 山 on its own is yama (the kun reading) — "mountain". But inside the compound 富士山 it becomes -san: Fuji-san, Mount Fuji. Same character, two sounds, picked by context. Likewise 水 alone is mizu (water), but 水曜日 ("Wednesday") reads sui-yōbi. You don't memorise a rule for each one — you absorb the pairings as you meet real words. It's far less scary in practice than it sounds here.

Your first kanji

These twelve are some of the very first kanji Japanese children learn, and they show the two-reading pattern clearly. Read across: the character, its meaning, the on'yomi (compound sound) and the kun'yomi (standalone sound).

Twelve starter kanji — meaning, on'yomi, kun'yomi

Kanji	Meaning	On'yomi	Kun'yomi
一	one	ichi	hito(tsu)
二	two	ni	futa(tsu)
三	three	san	mit(tsu)
人	person	jin, nin	hito
山	mountain	san	yama
川	river	sen	kawa
日	sun, day	nichi, jitsu	hi, -ka
月	moon, month	getsu, gatsu	tsuki
火	fire	ka	hi
水	water	sui	mizu
木	tree, wood	moku, boku	ki
大	big	dai, tai	ō(kii)

A bonus you already know: the days of the week

Five of those starter kanji line up with the elements, and Japanese builds the days of the week straight out of them — sun, moon, fire, water, wood, gold, earth. Learn the twelve above and the calendar comes nearly free.

The seven days, built from element kanji

Day	Kanji	Reading	Element
Sunday	日曜日	nichiyōbi	sun 日
Monday	月曜日	getsuyōbi	moon 月
Tuesday	火曜日	kayōbi	fire 火
Wednesday	水曜日	suiyōbi	water 水
Thursday	木曜日	mokuyōbi	wood 木
Friday	金曜日	kin'yōbi	gold 金
Saturday	土曜日	doyōbi	earth 土

How kanji are built: radicals

Complex kanji aren't memorised stroke-by-stroke from scratch — they're assembled from a small set of repeating parts called radicals. Spotting the parts turns a wall of strokes into a few familiar pieces, and the parts often hint at the meaning.

The same part, reused — and what it hints

Part	Hints at	Shows up in…
氵	water	海 umi (sea) · 池 ike (pond) · 泳 oyo(gu) (to swim)
木	tree, wood	林 hayashi (woods) · 森 mori (forest) · 校 (school)
人 / 亻	person	休 yasu(mu) (rest) · 体 karada (body)

How many kanji do you actually need?

The official set of everyday-use characters, the jōyō kanji, contains 2,136 characters — these are taught across primary and secondary school and are the ones you'll see in newspapers and signage. That number sounds enormous, so here's the reassuring reality:

• The most common ~1,000 kanji cover the large majority of everyday text.
• Beginners usually aim for around 100 first — enough to read a lot of basic material.
• Frequency is steep: a small core appears constantly, while many jōyō kanji are genuinely rare.
• You're never reading kanji alone — they sit in context, with grammar in hiragana around them, which makes them far easier to recognise than to recall cold.

Furigana: training wheels that really work

When a text expects readers who might not know a kanji yet — children's books, learner materials, song lyrics — it prints tiny hiragana above or beside the character to spell out its reading. These little helpers are called furigana. They mean you can start reading real Japanese long before you've memorised every character: the kanji gives the meaning, the furigana gives the sound, and over time you stop needing them. It's the single friendliest feature of the whole writing system.

Where to start

1. Master the kana first. Hiragana and katakana are finite and quick; they're also how every kanji reading is written down, so they come first, full stop.
2. Begin with the visual, high-frequency kanji. Numbers, days, 人・山・川・日・大 — the ones that are both common and easy to picture.
3. Learn kanji inside words, not in isolation. Memorising 水 = "water" is fine, but learning 水曜日 (Wednesday) teaches you a reading and a useful word at once.
4. Lean on radicals. A new kanji is usually old parts in a new arrangement — name the parts and it's half learned.
5. Read everything, accept furigana. Exposure beats drilling. The characters you meet often are the ones that stay.

New here? Start with the hiragana chart & reading guide, pick up the angular script in the katakana guide, see how the two kana compare in hiragana vs katakana, or learn to count in the Japanese numbers guide.